Version Packages (#3651)

Co-authored-by: github-actions[bot] <41898282+github-actions[bot]@users.noreply.github.com>

.github/actions/setup-playwright/action.yml

@@ -1,37 +0,0 @@
-name: 'Setup Playwright'
-description: 'Install Playwright and dependencies'
-runs:
-    using: 'composite'
-    steps:
-        # Run npm ci and get Playwright version
-        - name: 🏗 Prepare Playwright env
-          shell: bash
-          run: |
-              PLAYWRIGHT_VERSION=$(npm ls --json @playwright/test | jq --raw-output '.dependencies["gitbook"].dependencies["@playwright/test"].version')
-              echo "PLAYWRIGHT_VERSION=$PLAYWRIGHT_VERSION" >> $GITHUB_ENV
-
-        # Cache browser binaries, cache key is based on Playwright version and OS
-        - name: 🧰 Cache Playwright browser binaries
-          uses: actions/cache@v4
-          id: playwright-cache
-          with:
-              path: '~/.cache/ms-playwright'
-              key: '${{ runner.os }}-playwright-${{ env.PLAYWRIGHT_VERSION }}'
-              restore-keys: |
-                  ${{ runner.os }}-playwright-
-
-        # Install browser binaries & OS dependencies if cache missed
-        - name: 🏗 Install Playwright browser binaries & OS dependencies
-          if: steps.playwright-cache.outputs.cache-hit != 'true'
-          shell: bash
-          working-directory: packages/gitbook
-          run: |
-              bun x playwright install --with-deps chromium
-
-        # Install only the OS dependencies if cache hit
-        - name: 🏗 Install Playwright OS dependencies
-          if: steps.playwright-cache.outputs.cache-hit == 'true'
-          shell: bash
-          working-directory: packages/gitbook
-          run: |
-              bun x playwright install-deps

.github/workflows/deploy-preview.yaml

@@ -102,7 +102,7 @@ jobs:
         runs-on: ubuntu-latest
         name: Visual Testing v2
         needs: deploy-v2-vercel
-        timeout-minutes: 10
+        timeout-minutes: 15
         steps:
             - name: Checkout
               uses: actions/checkout@v4
@@ -110,8 +110,8 @@ jobs:
               uses: ./.github/composite/setup-bun
             - name: Install dependencies
               run: bun install --frozen-lockfile
-            - name: Setup Playwright
-              uses: ./.github/actions/setup-playwright
+              env:
+                  PUPPETEER_SKIP_DOWNLOAD: 1
             - name: Run Playwright tests
               run: bun e2e
               env:
@@ -123,7 +123,7 @@ jobs:
         runs-on: ubuntu-latest
         name: Visual Testing v2 (Cloudflare)
         needs: deploy-v2-cloudflare
-        timeout-minutes: 10
+        timeout-minutes: 15
         steps:
             - name: Checkout
               uses: actions/checkout@v4
@@ -131,8 +131,8 @@ jobs:
               uses: ./.github/composite/setup-bun
             - name: Install dependencies
               run: bun install --frozen-lockfile
-            - name: Setup Playwright
-              uses: ./.github/actions/setup-playwright
+              env:
+                  PUPPETEER_SKIP_DOWNLOAD: 1
             - name: Run Playwright tests
               run: bun e2e
               env:
@@ -144,7 +144,7 @@ jobs:
         runs-on: ubuntu-latest
         name: Visual Testing Customers v2
         needs: deploy-v2-vercel
-        timeout-minutes: 10
+        timeout-minutes: 15
         steps:
             - name: Checkout
               uses: actions/checkout@v4
@@ -152,8 +152,8 @@ jobs:
               uses: ./.github/composite/setup-bun
             - name: Install dependencies
               run: bun install --frozen-lockfile
-            - name: Setup Playwright
-              uses: ./.github/actions/setup-playwright
+              env:
+                  PUPPETEER_SKIP_DOWNLOAD: 1
             - name: Run Playwright tests
               run: bun e2e-customers
               env:
@@ -165,7 +165,7 @@ jobs:
         runs-on: ubuntu-latest
         name: Visual Testing Customers v2 (Cloudflare)
         needs: deploy-v2-cloudflare
-        timeout-minutes: 10
+        timeout-minutes: 15
         steps:
             - name: Checkout
               uses: actions/checkout@v4
@@ -173,8 +173,8 @@ jobs:
               uses: ./.github/composite/setup-bun
             - name: Install dependencies
               run: bun install --frozen-lockfile
-            - name: Setup Playwright
-              uses: ./.github/actions/setup-playwright
+              env:
+                  PUPPETEER_SKIP_DOWNLOAD: 1
             - name: Run Playwright tests
               run: bun e2e-customers
               env:
@@ -182,9 +182,9 @@ jobs:
                   SITE_BASE_URL: ${{ needs.deploy-v2-cloudflare.outputs.deployment-url }}/url/
                   ARGOS_TOKEN: ${{ secrets.ARGOS_TOKEN }}
                   ARGOS_BUILD_NAME: 'customers-v2'
-    pagespeed-testing-v2:
+    browserless-testing-v2-vercel:
         runs-on: ubuntu-latest
-        name: PageSpeed Testing v1
+        name: Browserless Testing v2 (Vercel)
         needs: deploy-v2-vercel
         steps:
             - name: Checkout
@@ -195,8 +195,26 @@ jobs:
               run: bun install --frozen-lockfile
               env:
                   PUPPETEER_SKIP_DOWNLOAD: 1
-            - name: Run pagespeed tests
-              run: bun ./packages/gitbook/tests/pagespeed-testing.ts
+            - name: Run tests
+              run: cd ./packages/gitbook && bun e2e-browserless
               env:
                   BASE_URL: ${{needs.deploy-v2-vercel.outputs.deployment-url}}
-                  PAGESPEED_API_KEY: ${{ secrets.PAGESPEED_API_KEY }}
+                  SITE_BASE_URL: ${{ needs.deploy-v2-vercel.outputs.deployment-url }}/url/
+    # browserless-testing-v2-cloudflare:
+    #     runs-on: ubuntu-latest
+    #     name: Browserless Testing v2 (Cloudflare)
+    #     needs: deploy-v2-cloudflare
+    #     steps:
+    #         - name: Checkout
+    #           uses: actions/checkout@v4
+    #         - name: Setup Bun
+    #           uses: ./.github/composite/setup-bun
+    #         - name: Install dependencies
+    #           run: bun install --frozen-lockfile
+    #           env:
+    #               PUPPETEER_SKIP_DOWNLOAD: 1
+    #         - name: Run tests
+    #           run: cd ./packages/gitbook && bun e2e-browserless
+    #           env:
+    #               BASE_URL: ${{needs.deploy-v2-cloudflare.outputs.deployment-url}}
+    #               SITE_BASE_URL: ${{ needs.deploy-v2-cloudflare.outputs.deployment-url }}/url/

biome.json

@@ -18,10 +18,12 @@
             "**/.vercel/**/*",
             "**/.cache/**/*",
             "**/.wrangler/**/*",
+            "packages/embed/standalone/**/*",
             "packages/openapi-parser/src/fixtures/**/*",
             "packages/emoji-codepoints/index.ts",
             "packages/icons/src/data/*.json",
-            "packages/gitbook/worker-configuration.d.ts"
+            "packages/gitbook/worker-configuration.d.ts",
+            "**/*.css"
         ]
     },
     "formatter": {

package.json

@@ -3,9 +3,9 @@
     "version": "0.1.0",
     "devDependencies": {
         "@biomejs/biome": "^1.9.4",
-        "@changesets/cli": "^2.27.12",
-        "turbo": "^2.5.0",
-        "vercel": "^39.3.0"
+        "@changesets/cli": "^2.29.7",
+        "turbo": "^2.5.8",
+        "vercel": "^39.4.2"
     },
     "packageManager": "bun@1.2.15",
     "overrides": {
@@ -16,7 +16,7 @@
     },
     "private": true,
     "scripts": {
-        "dev": "turbo run dev",
+        "dev": "turbo run dev --concurrency 20",
         "build": "turbo run build",
         "clean-deps": "rm -rf node_modules && rm -rf packages/*/node_modules",
         "typecheck": "turbo run typecheck",
@@ -26,15 +26,18 @@
         "e2e": "turbo run e2e",
         "e2e-customers": "turbo run e2e-customers",
         "changeset": "changeset",
-        "changeset-version": "changeset version && bun run format",
-        "release": "turbo run release && changeset publish",
+        "changeset-version": "changeset version && bun run format && bun update",
+        "release": "turbo run release && bun run publish-all-packages",
+        "publish-all-packages": "for dir in packages/*; do (cd \"$dir\" && bun publish || true); done && changeset tag",
         "download:env": "op read op://gitbook-x-dev/gitbook-open/.env.local >> .env.local",
         "clean": "turbo run clean"
     },
     "workspaces": {
         "packages": ["packages/*"],
         "catalog": {
-            "@gitbook/api": "^0.128.0"
+            "@gitbook/api": "0.143.2",
+            "bidc": "^0.0.2",
+            "tsdown": "^0.15.6"
         }
     },
     "patchedDependencies": {

packages/browser-types/.gitignore

@@ -0,0 +1 @@
+dist/

packages/browser-types/CHANGELOG.md

@@ -0,0 +1,13 @@
+# @gitbook/browser-types
+
+## 0.1.0
+
+### Minor Changes
+
+- cbc71a5: First version of the public package for typing script integrations.
+
+### Patch Changes
+
+- 854c448: Custom assistants followup
+- Updated dependencies [25e2b40]
+  - @gitbook/icons@0.3.0

packages/browser-types/README.md

@@ -0,0 +1,3 @@
+# `@gitbook/browser-types`
+
+Typescript types for the global variables available in a GitBook website. These types can be used by integrations embedding scripts.

packages/browser-types/package.json

@@ -0,0 +1,24 @@
+{
+    "name": "@gitbook/browser-types",
+    "description": "Typescript types for the global variables available in a GitBook website. These types can be used by integrations embedding scripts.",
+    "type": "module",
+    "exports": {
+        ".": {
+            "types": "./dist/index.d.ts",
+            "default": "./dist/index.js"
+        }
+    },
+    "version": "0.1.0",
+    "dependencies": {
+        "@gitbook/api": "catalog:",
+        "@gitbook/icons": "workspace:"
+    },
+    "devDependencies": {
+        "typescript": "^5.5.3"
+    },
+    "scripts": {
+        "build": "tsc",
+        "typecheck": "tsc --noEmit"
+    },
+    "files": ["dist", "README.md", "CHANGELOG.md"]
+}

packages/browser-types/src/index.ts

@@ -0,0 +1,84 @@
+import type { AIToolCallResult, AIToolDefinition } from '@gitbook/api';
+import type { IconName } from '@gitbook/icons';
+
+export type GitBookIntegrationEvent = 'load' | 'unload';
+
+export type GitBookIntegrationEventCallback = (...args: any[]) => void;
+
+export type GitBookIntegrationTool = AIToolDefinition & {
+    /**
+     * Confirmation action to be displayed to the user before executing the tool.
+     */
+    confirmation?: {
+        icon?: IconName;
+        label: string;
+    };
+
+    /**
+     * Callback when the tool is executed.
+     * The input is provided by the AI assistant following the input schema of the tool.
+     */
+    execute: (input: object) => Promise<Pick<AIToolCallResult, 'output' | 'summary'>>;
+};
+
+export type GitBookAssistant = {
+    /**
+     * Name of the assistant displayed in the UI.
+     */
+    label: string;
+
+    /**
+     * Icon of the assistant displayed in the UI.
+     * Any FontAwesome icon name is supported.
+     * @example 'sparkle'
+     */
+    icon: string;
+
+    /**
+     * Callback when the assistant is opened.
+     */
+    open: (query?: string) => void;
+
+    /**
+     * Whether to display the triggers for this assistant in the UI.
+     * @default true
+     */
+    ui?: boolean;
+};
+
+export type GitBookGlobal = {
+    /**
+     * Register an event listener.
+     */
+    addEventListener: (
+        type: GitBookIntegrationEvent,
+        func: GitBookIntegrationEventCallback
+    ) => void;
+
+    /**
+     * Remove an event listener.
+     */
+    removeEventListener: (
+        type: GitBookIntegrationEvent,
+        func: GitBookIntegrationEventCallback
+    ) => void;
+
+    /**
+     * Register a custom tool to be exposed to the AI assistant.
+     */
+    registerTool: (tool: GitBookIntegrationTool) => void;
+
+    /**
+     * Register a custom assistant to be available on the site.
+     */
+    registerAssistant: (assistant: GitBookAssistant) => () => void;
+};
+
+declare global {
+    interface Window {
+        /**
+         * Global `window.GitBook` object accessible by integrations.
+         */
+        GitBook?: GitBookGlobal;
+    }
+}

packages/browser-types/tsconfig.json

@@ -0,0 +1,25 @@
+{
+    "compilerOptions": {
+        "target": "esnext",
+        "lib": ["dom", "dom.iterable", "esnext"],
+        "allowJs": true,
+        "skipLibCheck": true,
+        "strict": true,
+        "noUncheckedIndexedAccess": true,
+        "noEmit": false,
+        "declaration": true,
+        "outDir": "dist",
+        "esModuleInterop": true,
+        "module": "esnext",
+        "moduleResolution": "bundler",
+        "resolveJsonModule": true,
+        "isolatedModules": true,
+        "jsx": "react-jsx",
+        "incremental": true,
+        "types": [
+            "bun-types" // add Bun global
+        ]
+    },
+    "include": ["src/**/*.ts", "src/**/*.tsx"],
+    "exclude": ["node_modules"]
+}

packages/cache-tags/src/index.ts

@@ -90,7 +90,7 @@ export function getCacheTag(
         | {
               tag: 'translation';
               organization: string;
-              translationSettings: string;
+              translation: string;
           }
 ): string {
     switch (spec.tag) {
@@ -115,23 +115,12 @@ export function getCacheTag(
         case 'openapi':
             return `organization:${spec.organization}:openapi:${spec.openAPISpec}`;
         case 'translation':
-            return `organization:${spec.organization}:translation:${spec.translationSettings}`;
+            return `organization:${spec.organization}:translation:${spec.translation}`;
         default:
             assertNever(spec);
     }
 }
 
-/**
- * Get the cache tag for a given URL.
- */
-export function getCacheTagForURL(url: string | URL) {
-    const parsedURL = url instanceof URL ? url : new URL(url);
-    return getCacheTag({
-        tag: 'url',
-        hostname: parsedURL.hostname,
-    });
-}
-
 /**
  * Get the tags for a computed content source.
  */
@@ -144,6 +133,10 @@ export function getComputedContentSourceCacheTags(
 ) {
     const tags: string[] = [];
 
+    if (!('dependencies' in source)) {
+        return tags;
+    }
+
     // We add the dependencies as tags, to ensure that the computed content is invalidated
     // when the dependencies are updated.
     const dependencies = Object.values(source.dependencies ?? {});
@@ -167,18 +160,18 @@ export function getComputedContentSourceCacheTags(
                         })
                     );
                     break;
-                case 'translation-language':
+                case 'translation':
                     tags.push(
                         getCacheTag({
                             tag: 'translation',
                             organization: inContext.organizationId,
-                            translationSettings: dependency.ref.translationSettings,
+                            translation: dependency.ref.translation,
                         })
                     );
                     break;
                 default:
                     // Do not throw for unknown dependency types
-                    // as it might mean we are lacking behind the API version
+                    // as it might mean we are lagging behind the API version
                     break;
             }
         });
@@ -194,9 +187,8 @@ export function getComputedContentSourceCacheTags(
     }
 
     // We invalidate the computed content when a new version of the integration is deployed.
-
     if (source.type.startsWith('integration:')) {
-        const integration = source.type.split(':')[1];
+        const integration = source.type.split(':')[1]!;
         tags.push(
             getCacheTag({
                 tag: 'integration',

packages/cache-tags/tsconfig.json

@@ -5,6 +5,7 @@
         "allowJs": true,
         "skipLibCheck": true,
         "strict": true,
+        "noUncheckedIndexedAccess": true,
         "noEmit": false,
         "declaration": true,
         "outDir": "dist",

packages/colors/CHANGELOG.md

@@ -1,5 +1,15 @@
 # @gitbook/colors
 
+## 0.4.0
+
+### Minor Changes
+
+- 17dd382: Add `original` background color step
+
+### Patch Changes
+
+- 193d591: Fix return type for `colorContrast`
+
 ## 0.3.3
 
 ### Patch Changes

packages/colors/package.json

@@ -8,7 +8,7 @@
             "default": "./dist/index.js"
         }
     },
-    "version": "0.3.3",
+    "version": "0.4.0",
     "devDependencies": {
         "typescript": "^5.5.3"
     },

packages/colors/src/transformations.ts

@@ -8,7 +8,7 @@ type RGBColor = [number, number, number];
 type OKLABColor = { L: number; A: number; B: number };
 type OKLCHColor = { L: number; C: number; H: number };
 
-const D65 = [95.047, 100.0, 108.883]; // Reference white (D65)
+const D65 = [95.047, 100.0, 108.883] as const; // Reference white (D65)
 
 export enum ColorCategory {
     backgrounds = 'backgrounds',
@@ -19,7 +19,7 @@ export enum ColorCategory {
 }
 
 type ColorSubScale = {
-    [key: string]: number;
+    [key: string]: number | string;
 };
 
 /**
@@ -56,6 +56,8 @@ export const scale: Record<ColorCategory, ColorSubScale> = {
         solid: 9,
         /** Hovered solid backgrounds */
         'solid-hover': 10,
+        /** Original color */
+        original: 'original',
     },
     [ColorCategory.text]: {
         /** Very low-contrast text
@@ -211,8 +213,8 @@ export function colorScale(
     const result = [];
 
     for (let index = 0; index < mapping.length; index++) {
-        const targetL =
-            foregroundColor.L * mapping[index] + backgroundColor.L * (1 - mapping[index]);
+        const step = mapping[index]!;
+        const targetL = foregroundColor.L * step + backgroundColor.L * (1 - step);
 
         if (
             index === 8 &&
@@ -295,7 +297,7 @@ export function rgbArrayToHex(rgb: RGBColor): string {
 
 export function getColor(percentage: number, start: RGBColor, end: RGBColor) {
     const rgb = end.map((channel, index) => {
-        return Math.round(channel + percentage * (start[index] - channel));
+        return Math.round(channel + percentage * (start[index]! - channel));
     });
 
     return rgbArrayToHex(rgb as RGBColor);
@@ -392,14 +394,14 @@ export function xyzToLab65(xyz: [number, number, number]): {
     B: number;
 } {
     const [x, y, z] = xyz.map((v, i) => {
-        const scaled = v / D65[i];
+        const scaled = v / D65[i]!;
         return scaled > 0.008856 ? Math.cbrt(scaled) : 7.787 * scaled + 16 / 116;
     });
 
     return {
-        L: 116 * y - 16,
-        A: 500 * (x - y),
-        B: 200 * (y - z),
+        L: 116 * y! - 16,
+        A: 500 * (x! - y!),
+        B: 200 * (y! - z!),
     };
 }
 
@@ -419,7 +421,10 @@ export function dpsContrast(a: RGBColor, b: RGBColor) {
     return contrast < 7.5 ? 0 : contrast;
 }
 
-export function colorContrast(background: string, foreground: string[] = [LIGHT_BASE, DARK_BASE]) {
+export function colorContrast(
+    background: string,
+    foreground: string[] = [LIGHT_BASE, DARK_BASE]
+): string {
     const bg = hexToRgbArray(background);
 
     const best: { color?: RGBColor; contrast: number } = {
@@ -436,5 +441,5 @@ export function colorContrast(background: string, foreground: string[] = [LIGHT_
         }
     }
 
-    return best.color ? rgbArrayToHex(best.color) : foreground[0];
+    return best.color ? rgbArrayToHex(best.color) : foreground[0] || LIGHT_BASE;
 }

packages/colors/tsconfig.json

@@ -5,6 +5,7 @@
         "allowJs": true,
         "skipLibCheck": true,
         "strict": true,
+        "noUncheckedIndexedAccess": true,
         "noEmit": false,
         "declaration": true,
         "outDir": "dist",

packages/embed/.gitignore

@@ -0,0 +1,2 @@
+dist/
+standalone/

packages/embed/CHANGELOG.md

@@ -0,0 +1,25 @@
+# @gitbook/embed
+
+## 0.1.2
+
+### Patch Changes
+
+- 7508674: Fix bundling of packages
+
+## 0.1.1
+
+### Patch Changes
+
+- 6f368b5: Fix embed assistant window width on small screens
+
+## 0.1.0
+
+### Minor Changes
+
+- 81a6bd7: Improve API to control the GitBook embed
+
+### Patch Changes
+
+- 8927e8f: Initial version of the embed SDK.
+- Updated dependencies [25e2b40]
+  - @gitbook/icons@0.3.0

packages/embed/README.md

@@ -0,0 +1,49 @@
+# `@gitbook/embed`
+
+Embed the GitBook Docs Assistant in your product or website.
+
+# Usage
+
+## As a script from your docs site
+
+All GitBook docs site includes a script to easily embed the docs assistant as a widget on your website.
+
+The script is served at `https://docs.company.com/~gitbook/embed/script.js`.
+
+You can find the embed script from your docs site settings, or you can copy the following and replace the `docs.company.com` by your docs site hostname.
+
+```html
+<script src="https://docs.company.com/~gitbook/embed/script.js"></script>
+<script>
+window.GitBook('show');
+</script>
+```
+
+## As a package from NPM
+
+Install the package: `npm install @gitbook/embed` and import it in your web application:
+
+```tsx
+import { createGitBook } from '@gitbook/embed';
+
+const gitbook = createGitBook({
+    siteURL: 'https://docs.company.com'
+});
+
+const iframe = document.createElement('iframe');
+iframe.src = gitbook.getFrameURL();
+
+const frame = gitbook.createFrame(iframe);
+```
+
+## As React components
+
+After installing the NPM package, you can import prebuilt React components:
+
+```tsx
+import { GitBookProvider, GitBookAssistantFrame } from '@gitbook/embed/react';
+
+<GitBookProvider siteURL="https://docs.company.com">
+    <GitBookAssistantFrame />
+</GitBookProvider>
+```

packages/embed/package.json

@@ -0,0 +1,37 @@
+{
+    "name": "@gitbook/embed",
+    "description": "Embeddable components for GitBook",
+    "type": "module",
+    "exports": {
+        ".": {
+            "types": "./dist/index.d.ts",
+            "default": "./dist/index.js"
+        },
+        "./react": {
+            "types": "./dist/react/index.d.ts",
+            "default": "./dist/react/index.js"
+        }
+    },
+    "version": "0.1.2",
+    "dependencies": {
+        "@gitbook/api": "catalog:",
+        "@gitbook/icons": "workspace:",
+        "bidc": "catalog:"
+    },
+    "peerDependencies": {
+        "react": "^18.0.0"
+    },
+    "devDependencies": {
+        "tsdown": "catalog:",
+        "typescript": "^5.5.3",
+        "react": "^19.0.0"
+    },
+    "scripts": {
+        "build": "bun run build-lib && bun run build-standalone",
+        "build-lib": "tsdown",
+        "build-standalone": "bun build src/standalone/index.ts --bundle --minify --outdir=standalone",
+        "clean": "rm -rf ./dist",
+        "typecheck": "tsc --noEmit"
+    },
+    "files": ["dist", "README.md", "CHANGELOG.md"]
+}

packages/embed/src/client/createGitBook.ts

@@ -0,0 +1,61 @@
+import { type GitBookFrameClient, createGitBookFrame } from './createGitBookFrame';
+
+export type CreateGitBookOptions = {
+    /**
+     * URL of the GitBook site to embed.
+     */
+    siteURL: string;
+};
+
+export type GetFrameURLOptions = {
+    /**
+     * Authentication to use for the frame.
+     */
+    visitor?: {
+        /**
+         * Signed JWT token for Adaptive Content or Visitor Authentication to use.
+         */
+        token?: string;
+
+        /**
+         * Unsigned claims to pass to the frame.
+         * You can use these claims in dynamic expressions using `visitor.claims.unsigned.<claim-name>`.
+         */
+        unsignedClaims?: Record<string, unknown>;
+    };
+};
+
+export type GitBookClient = {
+    /**
+     * Get the URL for a GitBook frame.
+     */
+    getFrameURL: (options: GetFrameURLOptions) => string;
+    /**
+     * Create a new GitBook frame.
+     */
+    createFrame: (iframe: HTMLIFrameElement) => GitBookFrameClient;
+};
+
+export function createGitBook(options: CreateGitBookOptions) {
+    const client: GitBookClient = {
+        getFrameURL: (frameOptions) => {
+            const url = new URL(options.siteURL);
+            url.pathname = `${url.pathname.endsWith('/') ? url.pathname : `${url.pathname}/`}~gitbook/embed/assistant`;
+
+            if (frameOptions.visitor?.token) {
+                url.searchParams.set('token', frameOptions.visitor.token);
+            }
+
+            if (frameOptions.visitor?.unsignedClaims) {
+                Object.entries(frameOptions.visitor.unsignedClaims).forEach(([key, value]) => {
+                    url.searchParams.set(`visitor.${key}`, String(value));
+                });
+            }
+
+            return url.toString();
+        },
+        createFrame: (iframe) => createGitBookFrame(iframe),
+    };
+
+    return client;
+}

packages/embed/src/client/createGitBookFrame.ts

@@ -0,0 +1,98 @@
+import { createChannel } from 'bidc';
+import type {
+    FrameToParentMessage,
+    GitBookEmbeddableConfiguration,
+    ParentToFrameMessage,
+} from './protocol';
+
+export type GitBookFrameClient = {
+    /**
+     * Navigate to a page by its path.
+     */
+    navigateToPage: (path: string) => void;
+
+    /**
+     * Navigate to the assistant.
+     */
+    navigateToAssistant: () => void;
+
+    /**
+     * Post a message to the chat.
+     */
+    postUserMessage: (message: string) => void;
+
+    /**
+     * Clear the chat.
+     */
+    clearChat: () => void;
+
+    /**
+     * Set the placeholder settings.
+     */
+    configure: (settings: Partial<GitBookEmbeddableConfiguration>) => void;
+
+    /**
+     * Register an event listener.
+     */
+    on: (event: string, listener: (...args: any[]) => void) => () => void;
+};
+
+/**
+ * Create a client to communicate with the GitBook Assistant frame.
+ */
+export function createGitBookFrame(iframe: HTMLIFrameElement): GitBookFrameClient {
+    if (!iframe.contentWindow) {
+        throw new Error('Iframe must have a content window');
+    }
+    const channel = createChannel(iframe.contentWindow);
+
+    channel.receive((message: FrameToParentMessage) => {
+        console.log('[gitbook:embed] received message', message);
+        if (message.type === 'close') {
+            const listeners = events.get('close') || [];
+            if (listeners) {
+                listeners.forEach((listener) => listener());
+            }
+        }
+    });
+
+    const sendToFrame = (message: ParentToFrameMessage) => {
+        console.log('[gitbook:embed] send message', message);
+        channel.send(message);
+    };
+
+    const events = new Map<string, Array<(...args: any[]) => void>>();
+
+    const configuration: GitBookEmbeddableConfiguration = {
+        buttons: [],
+        welcomeMessage: '',
+        suggestions: [],
+        tools: [],
+    };
+
+    return {
+        navigateToPage: (pagePath) => {
+            sendToFrame({ type: 'navigateToPage', pagePath });
+        },
+        navigateToAssistant: () => {
+            sendToFrame({ type: 'navigateToAssistant' });
+        },
+        postUserMessage: (message) => sendToFrame({ type: 'postUserMessage', message }),
+        configure: (settings) => {
+            Object.assign(configuration, settings);
+            sendToFrame({ type: 'configure', settings: configuration });
+        },
+        clearChat: () => sendToFrame({ type: 'clearChat' }),
+        on: (event, listener) => {
+            const listeners = events.get(event) || [];
+            listeners.push(listener);
+            events.set(event, listeners);
+            return () => {
+                events.set(
+                    event,
+                    listeners.filter((l) => l !== listener)
+                );
+            };
+        },
+    };
+}

packages/embed/src/client/index.ts

@@ -0,0 +1,3 @@
+export * from './createGitBook';
+export * from './createGitBookFrame';
+export * from './protocol';

packages/embed/src/client/protocol.ts

@@ -0,0 +1,90 @@
+import type { AIToolCallResult, AIToolDefinition } from '@gitbook/api';
+import type { IconName } from '@gitbook/icons';
+
+/**
+ * Custom tool definition to be passed to the AI assistant.
+ */
+export type GitBookToolDefinition = AIToolDefinition & {
+    /**
+     * Confirmation action to be displayed to the user before executing the tool.
+     */
+    confirmation?: {
+        icon?: IconName;
+        label: string;
+    };
+
+    /**
+     * Callback when the tool is executed.
+     * The input is provided by the AI assistant following the input schema of the tool.
+     */
+    execute: (input: object) => Promise<Pick<AIToolCallResult, 'output' | 'summary'>>;
+};
+
+/**
+ * Custom button definition to be passed to the embeddable GitBook.
+ */
+export type GitBookEmbeddableButtonDefinition = {
+    /**
+     * Icon to be displayed in the button.
+     */
+    icon: IconName;
+
+    /**
+     * Label to be displayed in the button.
+     */
+    label: string;
+
+    /**
+     * Callback when the button is clicked.
+     */
+    onClick: () => void | Promise<void>;
+};
+
+/**
+ * Overall configuration for the layout of the embeddable GitBook.
+ */
+export type GitBookEmbeddableConfiguration = {
+    /**
+     * Buttons to be displayed in the header of the embeddable GitBook.
+     */
+    buttons: GitBookEmbeddableButtonDefinition[];
+
+    /** Message to be displayed in the welcome page. */
+    welcomeMessage: string;
+
+    /** Suggestions of questions to be displayed in the welcome page. */
+    suggestions: string[];
+
+    /** Tools to be provided to the assistant. */
+    tools: GitBookToolDefinition[];
+};
+
+/**
+ * Messages sent from the parent to the frame.
+ */
+export type ParentToFrameMessage =
+    | {
+          type: 'postUserMessage';
+          message: string;
+      }
+    | {
+          type: 'clearChat';
+      }
+    | {
+          type: 'configure';
+          settings: GitBookEmbeddableConfiguration;
+      }
+    | {
+          type: 'navigateToPage';
+          pagePath: string;
+      }
+    | {
+          type: 'navigateToAssistant';
+      };
+
+/**
+ * Messages sent from the frame to the parent.
+ */
+export type FrameToParentMessage = {
+    type: 'close';
+};

packages/embed/src/index.ts

@@ -0,0 +1 @@
+export * from './client';

packages/embed/src/react/GitBookFrame.tsx

@@ -0,0 +1,51 @@
+import React from 'react';
+import type {
+    GetFrameURLOptions,
+    GitBookEmbeddableConfiguration,
+    GitBookFrameClient,
+} from '../client';
+import { useGitBook } from './GitBookProvider';
+
+export type GitBookFrameProps = {
+    className?: string;
+} & GetFrameURLOptions &
+    GitBookEmbeddableConfiguration;
+
+/**
+ * Render a frame with the GitBook Assistant in it.
+ */
+export function GitBookFrame(props: GitBookFrameProps) {
+    const { className, visitor, buttons, welcomeMessage, suggestions, tools } = props;
+
+    const frameRef = React.useRef<HTMLIFrameElement>(null);
+    const gitbook = useGitBook();
+    const [gitbookFrame, setGitbookFrame] = React.useState<GitBookFrameClient | null>(null);
+
+    const frameURL = React.useMemo(() => gitbook.getFrameURL({ visitor }), [gitbook, visitor]);
+
+    React.useEffect(() => {
+        if (frameRef.current) {
+            setGitbookFrame(gitbook.createFrame(frameRef.current));
+        }
+    }, [gitbook]);
+
+    React.useEffect(() => {
+        gitbookFrame?.configure({
+            buttons,
+            welcomeMessage,
+            suggestions,
+            tools,
+        });
+    }, [gitbookFrame, buttons, welcomeMessage, suggestions, tools]);
+
+    return (
+        <iframe
+            title="GitBook"
+            ref={frameRef}
+            src={frameURL}
+            width="100%"
+            height="100%"
+            className={className}
+        />
+    );
+}

packages/embed/src/react/GitBookProvider.tsx

@@ -0,0 +1,36 @@
+'use client';
+
+import * as React from 'react';
+import { type CreateGitBookOptions, createGitBook } from '../client';
+import { GitBookContext } from './context';
+
+/**
+ * Provider for the GitBook client.
+ */
+export function GitBookProvider(props: React.PropsWithChildren<CreateGitBookOptions>) {
+    const { siteURL, children } = props;
+
+    const options = React.useMemo(
+        () => ({
+            siteURL,
+        }),
+        [siteURL]
+    );
+
+    const client = React.useMemo(() => createGitBook(options), [options]);
+
+    return <GitBookContext.Provider value={client}>{children}</GitBookContext.Provider>;
+}
+
+/**
+ * Hook to access the GitBook client.
+ */
+export function useGitBook() {
+    const context = React.useContext(GitBookContext);
+
+    if (!context) {
+        throw new Error('This component must be used within a <GitBookProvider />');
+    }
+
+    return context;
+}

packages/embed/src/react/context.ts

@@ -0,0 +1,6 @@
+'use client';
+
+import * as React from 'react';
+import type { GitBookClient } from '../client';
+
+export const GitBookContext = React.createContext<GitBookClient | null>(null);

packages/embed/src/react/index.ts

@@ -0,0 +1,2 @@
+export * from './GitBookProvider';
+export * from './GitBookFrame';

packages/embed/src/standalone/index.ts

@@ -0,0 +1,178 @@
+import './style.css';
+
+import {
+    type CreateGitBookOptions,
+    type GetFrameURLOptions,
+    type GitBookClient,
+    type GitBookEmbeddableConfiguration,
+    type GitBookFrameClient,
+    createGitBook,
+} from '../client';
+
+export type GitBook = () => void;
+
+type StandaloneCalls =
+    // Initialize the widget
+    | ['init', CreateGitBookOptions, GetFrameURLOptions]
+    // Unload the widget
+    | ['unload']
+    // Show the widget
+    | ['show']
+    // Hide the widget
+    | ['hide']
+    // Open the window
+    | ['open']
+    // Close the window
+    | ['close']
+    // Toggle the window
+    | ['toggle']
+    // Post a user message
+    | ['postUserMessage', string]
+    // Clear the chat
+    | ['clearChat']
+    // Configure the embed
+    | ['configure', Partial<GitBookEmbeddableConfiguration>]
+    // Navigate to a page
+    | ['navigateToPage', string]
+    // Navigate to the assistant
+    | ['navigateToAssistant'];
+
+export type GitBookStandalone = ((...args: StandaloneCalls) => void) & {
+    q?: StandaloneCalls[];
+};
+
+const widgetButton = document.createElement('button');
+widgetButton.id = 'gitbook-widget-button';
+widgetButton.addEventListener('click', () => {
+    GitBook('toggle');
+});
+widgetButton.innerHTML = `
+    <span id="gitbook-widget-button-icon"></span>
+    <span id="gitbook-widget-button-label">Ask</span>
+`;
+
+const widgetWindow = document.createElement('div');
+widgetWindow.id = 'gitbook-widget-window';
+widgetWindow.classList.add('hidden');
+
+document.body.appendChild(widgetButton);
+document.body.appendChild(widgetWindow);
+
+let widgetIframe: HTMLIFrameElement | undefined;
+let _client: GitBookClient | undefined;
+let _frame: GitBookFrameClient | undefined;
+let frameOptions: GetFrameURLOptions | undefined;
+let frameConfiguration: GitBookEmbeddableConfiguration = {
+    buttons: [],
+    welcomeMessage: '',
+    suggestions: [],
+    tools: [],
+};
+
+function getClient() {
+    if (!_client) {
+        throw new Error(
+            'GitBook client not initialized. Call GitBook("init", { siteURL: "..." }) first.'
+        );
+    }
+    return _client;
+}
+
+function getIframe() {
+    if (!widgetIframe || !_frame) {
+        const client = getClient();
+
+        widgetIframe?.remove();
+        widgetIframe = document.createElement('iframe');
+        widgetIframe.id = 'gitbook-widget-iframe';
+        widgetIframe.src = client.getFrameURL({
+            ...frameOptions,
+        });
+        widgetWindow.appendChild(widgetIframe);
+
+        _frame = client.createFrame(widgetIframe);
+    }
+    return { iframe: widgetIframe, frame: _frame };
+}
+
+const GitBook = (...args: StandaloneCalls) => {
+    switch (args[0]) {
+        case 'init':
+            if (_client) {
+                throw new Error(
+                    'GitBook client already initialized. Call GitBook("unload") first.'
+                );
+            }
+            _client = createGitBook(args[1]);
+            frameOptions = args[2];
+            break;
+        case 'unload':
+            _client = undefined;
+            _frame = undefined;
+            widgetIframe?.remove();
+            widgetWindow.classList.add('hidden');
+            break;
+        case 'show':
+            widgetButton.classList.remove('hidden');
+            break;
+        case 'hide':
+            widgetButton.classList.add('hidden');
+            break;
+        case 'open':
+            widgetWindow.classList.remove('hidden');
+            widgetButton.classList.add('open');
+            getIframe();
+            break;
+        case 'toggle':
+            widgetWindow.classList.toggle('hidden');
+            widgetButton.classList.toggle('open');
+            getIframe();
+            break;
+        case 'close':
+            widgetWindow.classList.add('hidden');
+            widgetButton.classList.remove('open');
+            break;
+        case 'postUserMessage':
+            getIframe().frame.postUserMessage(args[1]);
+            break;
+        case 'configure':
+            frameConfiguration = {
+                ...frameConfiguration,
+                ...args[1],
+            };
+            getIframe().frame.configure({
+                ...frameConfiguration,
+                buttons: [
+                    ...frameConfiguration.buttons,
+
+                    // Always include a close button
+                    {
+                        icon: 'close',
+                        label: 'Close',
+                        onClick: () => {
+                            GitBook('close');
+                        },
+                    },
+                ],
+            });
+            break;
+        case 'clearChat':
+            getIframe().frame.clearChat();
+            break;
+        case 'navigateToPage':
+            getIframe().frame.navigateToPage(args[1]);
+            break;
+        case 'navigateToAssistant':
+            getIframe().frame.navigateToAssistant();
+            break;
+    }
+};
+
+// @ts-expect-error - GitBook is not defined in the global scope
+const precalls = (window.GitBook as GitBookStandalone | undefined)?.q ?? [];
+
+// @ts-expect-error - GitBook is not defined in the global scope
+window.GitBook = GitBook;
+precalls.forEach((call) => GitBook(...call));
+
+GitBook('configure', {});

packages/embed/src/standalone/style.css

@@ -0,0 +1,171 @@
+:root {
+    --gitbook-widget-top: 1rem;
+    --gitbook-widget-bottom: 1rem;
+    --gitbook-widget-right: 1rem;
+    --gitbook-widget-left: 1rem;
+
+    --gitbook-widget-button-height: 46px;
+
+    --gitbook-widget-radius: .5rem;
+    --gitbook-widget-text-size: 1rem;
+    --gitbook-widget-text-color: #656973;
+    --gitbook-widget-border-color: #e5e5e5;
+
+    --gitbook-widget-background-translucent: rgba(255, 255, 255, 0.9);
+    --gitbook-widget-background-translucent-hover: rgba(250, 250, 250, 0.9);
+    --gitbook-widget-background-solid: #FFFFFF;
+    --gitbook-widget-background-solid-hover: #FBFBFB;
+
+    --gitbook-widget-icon-size: 1.25rem;
+
+    --gitbook-widget-window-width: 28rem; /* 448px */
+    --gitbook-widget-window-height: 40rem; /* 640px */
+    --gitbook-widget-window-spacing: .5rem; /* Spacing between the button and the window */
+    --gitbook-widget-window-bottom: calc(var(--gitbook-widget-bottom) + var(--gitbook-widget-button-height) + var(--gitbook-widget-window-spacing));
+
+    --gitbook-widget-transition-duration-fast: 0.2s;
+    --gitbook-widget-transition-duration-slow: 0.5s;
+    --gitbook-widget-easing: cubic-bezier(0.25, 1, 0.5, 1);
+    --gitbook-widget-easing-bounce: cubic-bezier(0.34, 1.56, 0.64, 1);
+}
+
+* {
+    box-sizing: border-box;
+}
+
+/* Button */
+#gitbook-widget-button {
+    position: fixed;
+    bottom: var(--gitbook-widget-bottom);
+    right: var(--gitbook-widget-right);
+    height: var(--gitbook-widget-button-height);
+    z-index: 9999;
+
+    display: flex;
+    align-items: center;
+    flex-direction: row-reverse;
+    gap: .5rem;
+    padding: .75rem 1rem;
+
+    border-radius: 100px;
+    border: 1px solid var(--gitbook-widget-border-color);
+    background-color: var(--gitbook-widget-background-translucent);
+    backdrop-filter: blur(16px);
+
+    font-size: var(--gitbook-widget-text-size);
+    color: var(--gitbook-widget-text-color);
+
+    box-shadow: 0 1px 3px 0 rgba(0,0,0,0.05), 0 1px 2px -1px rgba(0,0,0,0.05);
+    transition: all var(--gitbook-widget-transition-duration-fast) var(--gitbook-widget-easing);
+
+    cursor:pointer;
+    animation: gitbook-widget-present var(--gitbook-widget-transition-duration-slow) var(--gitbook-widget-easing-bounce);
+}
+
+#gitbook-widget-button:hover, #gitbook-widget-button:focus-visible {
+    background-color: var(--gitbook-widget-background-translucent-hover);
+}
+#gitbook-widget-button:hover, #gitbook-widget-button:focus-visible {
+    transform: translateY(-1px);
+    box-shadow: 0 4px 6px -1px rgba(0,0,0,0.1), 0 2px 4px -2px rgba(0,0,0,0.1);
+}
+#gitbook-widget-button:active {
+    transform: translateY(0);
+    box-shadow: 0 1px 3px 0 rgba(0,0,0,0.05), 0 1px 2px -1px rgba(0,0,0,0.05);
+}
+
+@media (prefers-contrast: more) {
+    #gitbook-widget-button {
+        background-color: var(--gitbook-widget-background-solid);
+    }
+    #gitbook-widget-button:hover, #gitbook-widget-button:focus-visible {
+        background-color: var(--gitbook-widget-background-solid-hover);
+    }
+}
+
+#gitbook-widget-button.hidden {
+    display: none;
+}
+
+#gitbook-widget-button.open {
+    padding: .75rem;
+    gap: 0;
+}
+
+/* Button: Icon */
+#gitbook-widget-button-icon {
+    width: var(--gitbook-widget-icon-size);
+    height: var(--gitbook-widget-icon-size);
+    mask-image: url("https://static-2v.gitbook.com/~gitbook/static/icons/svgs/custom-icons/gitbook-assistant.svg?v=2");
+    mask-size: contain;
+    mask-repeat: no-repeat;
+    mask-position: center;
+    background-color: currentColor;
+}
+
+#gitbook-widget-button.open #gitbook-widget-button-icon {
+    mask-image: url('https://ka-p.fontawesome.com/releases/v6.6.0/svgs/regular/close.svg?v=2&token=a463935e93');
+}
+
+/* Button: Label */
+#gitbook-widget-button.open #gitbook-widget-button-label {
+    display: none;
+}
+
+/* Window */
+#gitbook-widget-window {
+    position: fixed;
+    bottom: var(--gitbook-widget-window-bottom);
+    right: var(--gitbook-widget-right);
+    z-index: 9998;
+    width: calc(min(var(--gitbook-widget-window-width), calc(100vw - var(--gitbook-widget-right) - var(--gitbook-widget-left))));
+    height: calc(min(var(--gitbook-widget-window-height), calc(100vh - var(--gitbook-widget-window-bottom) - var(--gitbook-widget-top))));
+    background-color: var(--gitbook-widget-background-solid);
+    border: 1px solid var(--gitbook-widget-border-color);
+    border-radius: var(--gitbook-widget-radius);
+    box-shadow: 0 10px 15px -3px rgb(0 0 0 / 0.1), 0 4px 6px -4px rgb(0 0 0 / 0.1);
+    overflow: hidden;
+    transition-property: transform, opacity, display;
+    transition-duration: var(--gitbook-widget-transition-duration-slow);
+    transition-timing-function: var(--gitbook-widget-easing-bounce);
+    transform-origin: bottom right;
+    transition-behavior: allow-discrete;
+}
+
+@starting-style {
+    #gitbook-widget-window {
+        opacity: 0;
+        transform: scale(0.9);
+    }
+}
+
+body:has(#gitbook-widget-button.hidden) #gitbook-widget-window {
+    bottom: var(--gitbook-widget-bottom);
+}
+
+#gitbook-widget-window.hidden {
+    transition-property: transform, opacity, display;
+    transition-duration: var(--gitbook-widget-transition-duration-fast);
+    transition-timing-function: var(--gitbook-widget-easing);
+    transition-behavior: allow-discrete;
+    display: none;
+    opacity: 0;
+    transform: scale(0.9);
+}
+
+#gitbook-widget-iframe {
+    width: 100%;
+    height: 100%;
+    border: none;
+}
+
+@keyframes gitbook-widget-present {
+    from {
+        opacity: 0;
+        transform: scale(0.9);
+    }
+    to {
+        opacity: 1;
+        transform: scale(1);
+    }
+}

packages/embed/tsconfig.json

@@ -0,0 +1,22 @@
+{
+    "compilerOptions": {
+        "target": "esnext",
+        "lib": ["dom", "dom.iterable", "esnext"],
+        "allowJs": true,
+        "skipLibCheck": true,
+        "strict": true,
+        "noEmit": false,
+        "declaration": true,
+        "outDir": "dist",
+        "esModuleInterop": true,
+        "module": "esnext",
+        "moduleResolution": "bundler",
+        "resolveJsonModule": true,
+        "isolatedModules": true,
+        "jsx": "react-jsx",
+        "incremental": true,
+        "types": []
+    },
+    "include": ["src/**/*.ts", "src/**/*.tsx"],
+    "exclude": ["node_modules"]
+}

packages/embed/tsdown.config.ts

@@ -0,0 +1,9 @@
+import { defineConfig } from 'tsdown';
+
+export default defineConfig([
+    {
+        entry: ['src/index.ts', 'src/react/index.ts'],
+        dts: true,
+        format: ['esm'],
+    },
+]);

packages/expr/.gitignore

@@ -0,0 +1 @@
+dist

packages/expr/CHANGELOG.md

@@ -0,0 +1,35 @@
+# @gitbook/expr
+
+## 1.2.1
+
+### Patch Changes
+
+- a629900: Add dev script for @gitbook/expr
+
+## 1.2.0
+
+### Minor Changes
+
+- 6da3655: Fix exports in gitbook/expr package.json
+
+## 1.1.1
+
+### Patch Changes
+
+- 3548fa6: Fix eval-estree-expr named import
+
+## 1.1.0
+
+### Minor Changes
+
+- e1ff17e: Fix bundling of gitbook/expr package
+
+### Patch Changes
+
+- 8ff1e3b: Add support for every/some array methods
+
+## 1.0.0
+
+### Major Changes
+
+- ada195d: Publish gitbook/expr package to help evaluate user defined expressions.

packages/expr/README.md

@@ -0,0 +1,3 @@
+# `@gitbook/expr`
+
+Safely evaluate & parse user-defined GitBook expressions.

packages/expr/package.json

@@ -0,0 +1,38 @@
+{
+    "name": "@gitbook/expr",
+    "description": "Safely evaluate & parse user-defined GitBook expressions.",
+    "version": "1.2.1",
+    "type": "module",
+    "exports": {
+        ".": {
+            "types": "./dist/index.d.ts",
+            "import": "./dist/index.js",
+            "default": "./dist/index.js"
+        }
+    },
+    "sideEffects": false,
+    "dependencies": {
+        "eval-estree-expression": "github:jonschlinkert/eval-estree-expression#9cf28d2",
+        "acorn": "^8.14.0",
+        "acorn-loose": "8.4.0",
+        "acorn-walk": "^8.3.4",
+        "escodegen": "^2.1.0",
+        "assert-never": "^1.2.1"
+    },
+    "devDependencies": {
+        "bun-types": "^1.1.20",
+        "tsdown": "catalog:",
+        "@types/estree": "^1.0.6",
+        "@babel/types": "^7.26.0",
+        "@types/json-schema": "^7.0.15",
+        "@types/escodegen": "^0.0.10"
+    },
+    "scripts": {
+        "build": "tsdown",
+        "typecheck": "tsc --noEmit",
+        "unit": "bun test",
+        "clean": "rm -rf ./dist",
+        "dev": "bun run build -- --watch"
+    },
+    "files": ["dist", "README.md", "CHANGELOG.md"]
+}

packages/expr/src/__tests__/autocomplete.test.ts

@@ -0,0 +1,889 @@
+import { describe, expect, it } from 'bun:test';
+
+import { ExpressionRuntime } from '../runtime';
+import {
+    SymbolArray,
+    SymbolBoolean,
+    SymbolNumber,
+    SymbolObject,
+    SymbolString,
+    SymbolType,
+    SymbolsTable,
+} from '../symbols';
+import {
+    type AutocompleteSuggestions,
+    type AutocompleteSymbolSuggestion,
+    SUPPORTED_BINARY_OPERATORS,
+    SUPPORTED_CONDITIONAL_OPERATORS,
+    SUPPORTED_LOGICAL_OPERATORS,
+} from '../types';
+
+describe('autocomplete', () => {
+    const runtime = new ExpressionRuntime();
+    const visitorClaimsHelloArraySymbol = SymbolArray({
+        name: 'hello',
+        description: 'An array of string',
+        items: SymbolString(),
+    });
+    const symbols = {
+        visitor: SymbolObject({
+            name: 'visitor',
+            properties: {
+                claims: SymbolObject({
+                    name: 'claims',
+                    description: 'The claims contained in the visitor JWT token',
+                    properties: {
+                        key: SymbolString({ name: 'key' }),
+                        flags: SymbolObject({
+                            name: 'flags',
+                            properties: {
+                                FLAG1: SymbolBoolean({ name: 'FLAG1' }),
+                                FLAG2: SymbolBoolean({ name: 'FLAG2' }),
+                                FLAG3: SymbolBoolean({ name: 'FLAG3' }),
+                                FLAG4: SymbolBoolean({ name: 'FLAG4' }),
+                            },
+                            methods: [],
+                        }),
+                        hello: visitorClaimsHelloArraySymbol,
+                        role: SymbolString({
+                            name: 'role',
+                            enum: ['admin', 'editor', 'reader'],
+                        }),
+                    },
+                    methods: [],
+                }),
+            },
+            methods: [],
+        }),
+    };
+    const context = new SymbolsTable(symbols);
+    const SCENARIOS: Array<{
+        expressionWithCursor: string;
+        expectedSuggestions: AutocompleteSuggestions;
+    }> = [
+        {
+            expressionWithCursor: 'visit<cur>',
+            expectedSuggestions: [
+                {
+                    type: 'symbol',
+                    symbol: {
+                        definition: SymbolObject({
+                            name: 'visitor',
+                            properties: {
+                                claims: SymbolObject({
+                                    name: 'claims',
+                                    description: 'The claims contained in the visitor JWT token',
+                                    properties: {
+                                        key: SymbolString({ name: 'key' }),
+                                        flags: SymbolObject({
+                                            name: 'flags',
+                                            properties: {
+                                                FLAG1: SymbolBoolean({ name: 'FLAG1' }),
+                                                FLAG2: SymbolBoolean({ name: 'FLAG2' }),
+                                                FLAG3: SymbolBoolean({ name: 'FLAG3' }),
+                                                FLAG4: SymbolBoolean({ name: 'FLAG4' }),
+                                            },
+                                            methods: [],
+                                        }),
+                                        hello: SymbolArray({
+                                            name: 'hello',
+                                            description: 'An array of string',
+                                            items: SymbolString(),
+                                        }),
+                                        role: SymbolString({
+                                            name: 'role',
+                                            enum: ['admin', 'editor', 'reader'],
+                                        }),
+                                    },
+                                    methods: [],
+                                }),
+                            },
+                            methods: [],
+                        }),
+                        ref: 'visitor',
+                        parentRef: undefined,
+                        childrenRefs: ['visitor.claims'],
+                    },
+                },
+            ],
+        },
+        {
+            expressionWithCursor: 'visitor<cur>',
+            expectedSuggestions: [],
+        },
+        {
+            expressionWithCursor: 'visitor.<cur>',
+            expectedSuggestions: [
+                {
+                    type: 'symbol',
+                    symbol: {
+                        definition: SymbolObject({
+                            name: 'claims',
+                            description: 'The claims contained in the visitor JWT token',
+                            properties: {
+                                key: SymbolString({ name: 'key' }),
+                                flags: SymbolObject({
+                                    name: 'flags',
+                                    properties: {
+                                        FLAG1: SymbolBoolean({ name: 'FLAG1' }),
+                                        FLAG2: SymbolBoolean({ name: 'FLAG2' }),
+                                        FLAG3: SymbolBoolean({ name: 'FLAG3' }),
+                                        FLAG4: SymbolBoolean({ name: 'FLAG4' }),
+                                    },
+                                    methods: [],
+                                }),
+                                hello: SymbolArray({
+                                    name: 'hello',
+                                    description: 'An array of string',
+                                    items: SymbolString(),
+                                }),
+                                role: SymbolString({
+                                    name: 'role',
+                                    enum: ['admin', 'editor', 'reader'],
+                                }),
+                            },
+                            methods: [],
+                        }),
+                        ref: 'visitor.claims',
+                        parentRef: 'visitor',
+                        childrenRefs: [
+                            'visitor.claims.key',
+                            'visitor.claims.flags',
+                            'visitor.claims.hello',
+                            'visitor.claims.role',
+                        ],
+                    },
+                },
+            ],
+        },
+        {
+            expressionWithCursor: 'visitor.claims.<cur>',
+            expectedSuggestions: [
+                {
+                    type: 'symbol',
+                    symbol: {
+                        definition: SymbolString({ name: 'key' }),
+                        ref: 'visitor.claims.key',
+                        parentRef: 'visitor.claims',
+                        childrenRefs: [
+                            'visitor.claims.key.length',
+                            'visitor.claims.key.at',
+                            'visitor.claims.key.endsWith',
+                            'visitor.claims.key.includes',
+                        ],
+                    },
+                },
+                {
+                    type: 'symbol',
+                    symbol: {
+                        definition: SymbolObject({
+                            name: 'flags',
+                            properties: {
+                                FLAG1: SymbolBoolean({ name: 'FLAG1' }),
+                                FLAG2: SymbolBoolean({ name: 'FLAG2' }),
+                                FLAG3: SymbolBoolean({ name: 'FLAG3' }),
+                                FLAG4: SymbolBoolean({ name: 'FLAG4' }),
+                            },
+                            methods: [],
+                        }),
+                        ref: 'visitor.claims.flags',
+                        parentRef: 'visitor.claims',
+                        childrenRefs: [
+                            'visitor.claims.flags.FLAG1',
+                            'visitor.claims.flags.FLAG2',
+                            'visitor.claims.flags.FLAG3',
+                            'visitor.claims.flags.FLAG4',
+                        ],
+                    },
+                },
+                {
+                    type: 'symbol',
+                    symbol: {
+                        definition: SymbolArray({
+                            name: 'hello',
+                            description: 'An array of string',
+                            items: SymbolString(),
+                        }),
+                        ref: 'visitor.claims.hello',
+                        parentRef: 'visitor.claims',
+                        childrenRefs: [
+                            'visitor.claims.hello.length',
+                            'visitor.claims.hello.at',
+                            'visitor.claims.hello.includes',
+                            'visitor.claims.hello.some',
+                            'visitor.claims.hello.every',
+                        ],
+                    },
+                },
+                {
+                    type: 'symbol',
+                    symbol: {
+                        definition: SymbolString({
+                            name: 'role',
+                            enum: ['admin', 'editor', 'reader'],
+                        }),
+                        ref: 'visitor.claims.role',
+                        parentRef: 'visitor.claims',
+                        childrenRefs: [
+                            'visitor.claims.role.length',
+                            'visitor.claims.role.at',
+                            'visitor.claims.role.endsWith',
+                            'visitor.claims.role.includes',
+                        ],
+                    },
+                },
+            ],
+        },
+        {
+            expressionWithCursor: 'visitor.claims.ke<cur>',
+            expectedSuggestions: [
+                {
+                    type: 'symbol',
+                    symbol: {
+                        definition: SymbolString({ name: 'key' }),
+                        ref: 'visitor.claims.key',
+                        parentRef: 'visitor.claims',
+                        childrenRefs: [
+                            'visitor.claims.key.length',
+                            'visitor.claims.key.at',
+                            'visitor.claims.key.endsWith',
+                            'visitor.claims.key.includes',
+                        ],
+                    },
+                },
+            ],
+        },
+        {
+            expressionWithCursor: 'visitor.claims.h<cur>',
+            expectedSuggestions: [
+                {
+                    type: 'symbol',
+                    symbol: {
+                        definition: SymbolArray({
+                            name: 'hello',
+                            description: 'An array of string',
+                            items: SymbolString(),
+                        }),
+                        ref: 'visitor.claims.hello',
+                        parentRef: 'visitor.claims',
+                        childrenRefs: [
+                            'visitor.claims.hello.length',
+                            'visitor.claims.hello.at',
+                            'visitor.claims.hello.includes',
+                            'visitor.claims.hello.some',
+                            'visitor.claims.hello.every',
+                        ],
+                    },
+                },
+            ],
+        },
+        {
+            expressionWithCursor: 'visitor.claims.hello.<cur>',
+            expectedSuggestions: [
+                {
+                    type: 'symbol',
+                    symbol: {
+                        definition: SymbolNumber({
+                            name: 'length',
+                            description: `The length data property of an Array instance represents the number of elements in that array.
+                The value is an unsigned, 32-bit integer that is always numerically greater than the highest index in the array.`,
+                            link: 'https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Array/length',
+                        }),
+                        ref: 'visitor.claims.hello.length',
+                        parentRef: 'visitor.claims.hello',
+                        childrenRefs: [],
+                    },
+                },
+                ...visitorClaimsHelloArraySymbol.methods.map<AutocompleteSymbolSuggestion>(
+                    (method) => ({
+                        type: 'symbol',
+                        symbol: {
+                            definition: method,
+                            ref: `visitor.claims.hello.${method.name}`,
+                            parentRef: 'visitor.claims.hello',
+                            childrenRefs: [],
+                        },
+                    })
+                ),
+            ],
+        },
+        {
+            expressionWithCursor: 'visitor.claims.f<cur>',
+            expectedSuggestions: [
+                {
+                    type: 'symbol',
+                    symbol: {
+                        definition: SymbolObject({
+                            name: 'flags',
+                            properties: {
+                                FLAG1: SymbolBoolean({ name: 'FLAG1' }),
+                                FLAG2: SymbolBoolean({ name: 'FLAG2' }),
+                                FLAG3: SymbolBoolean({ name: 'FLAG3' }),
+                                FLAG4: SymbolBoolean({ name: 'FLAG4' }),
+                            },
+                            methods: [],
+                        }),
+                        ref: 'visitor.claims.flags',
+                        parentRef: 'visitor.claims',
+                        childrenRefs: [
+                            'visitor.claims.flags.FLAG1',
+                            'visitor.claims.flags.FLAG2',
+                            'visitor.claims.flags.FLAG3',
+                            'visitor.claims.flags.FLAG4',
+                        ],
+                    },
+                },
+            ],
+        },
+        {
+            expressionWithCursor: 'visitor.claims.fl<cur>',
+            expectedSuggestions: [
+                {
+                    type: 'symbol',
+                    symbol: {
+                        definition: SymbolObject({
+                            name: 'flags',
+                            properties: {
+                                FLAG1: SymbolBoolean({ name: 'FLAG1' }),
+                                FLAG2: SymbolBoolean({ name: 'FLAG2' }),
+                                FLAG3: SymbolBoolean({ name: 'FLAG3' }),
+                                FLAG4: SymbolBoolean({ name: 'FLAG4' }),
+                            },
+                            methods: [],
+                        }),
+                        ref: 'visitor.claims.flags',
+                        parentRef: 'visitor.claims',
+                        childrenRefs: [
+                            'visitor.claims.flags.FLAG1',
+                            'visitor.claims.flags.FLAG2',
+                            'visitor.claims.flags.FLAG3',
+                            'visitor.claims.flags.FLAG4',
+                        ],
+                    },
+                },
+            ],
+        },
+        {
+            expressionWithCursor: 'visitor.claims.flags.<cur>',
+            expectedSuggestions: [
+                {
+                    type: 'symbol',
+                    symbol: {
+                        definition: SymbolBoolean({ name: 'FLAG1' }),
+                        ref: 'visitor.claims.flags.FLAG1',
+                        parentRef: 'visitor.claims.flags',
+                        childrenRefs: [],
+                    },
+                },
+                {
+                    type: 'symbol',
+                    symbol: {
+                        definition: SymbolBoolean({ name: 'FLAG2' }),
+                        ref: 'visitor.claims.flags.FLAG2',
+                        parentRef: 'visitor.claims.flags',
+                        childrenRefs: [],
+                    },
+                },
+                {
+                    type: 'symbol',
+                    symbol: {
+                        definition: SymbolBoolean({ name: 'FLAG3' }),
+                        ref: 'visitor.claims.flags.FLAG3',
+                        parentRef: 'visitor.claims.flags',
+                        childrenRefs: [],
+                    },
+                },
+                {
+                    type: 'symbol',
+                    symbol: {
+                        definition: SymbolBoolean({ name: 'FLAG4' }),
+                        ref: 'visitor.claims.flags.FLAG4',
+                        parentRef: 'visitor.claims.flags',
+                        childrenRefs: [],
+                    },
+                },
+            ],
+        },
+        {
+            expressionWithCursor: 'visitor.claims.flags.FL<cur>',
+            expectedSuggestions: [
+                {
+                    type: 'symbol',
+                    symbol: {
+                        definition: SymbolBoolean({ name: 'FLAG1' }),
+                        ref: 'visitor.claims.flags.FLAG1',
+                        parentRef: 'visitor.claims.flags',
+                        childrenRefs: [],
+                    },
+                },
+                {
+                    type: 'symbol',
+                    symbol: {
+                        definition: SymbolBoolean({ name: 'FLAG2' }),
+                        ref: 'visitor.claims.flags.FLAG2',
+                        parentRef: 'visitor.claims.flags',
+                        childrenRefs: [],
+                    },
+                },
+                {
+                    type: 'symbol',
+                    symbol: {
+                        definition: SymbolBoolean({ name: 'FLAG3' }),
+                        ref: 'visitor.claims.flags.FLAG3',
+                        parentRef: 'visitor.claims.flags',
+                        childrenRefs: [],
+                    },
+                },
+                {
+                    type: 'symbol',
+                    symbol: {
+                        definition: SymbolBoolean({ name: 'FLAG4' }),
+                        ref: 'visitor.claims.flags.FLAG4',
+                        parentRef: 'visitor.claims.flags',
+                        childrenRefs: [],
+                    },
+                },
+            ],
+        },
+        {
+            expressionWithCursor: 'visitor.claims.flags.FLAG1<cur>',
+            expectedSuggestions: [],
+        },
+        {
+            expressionWithCursor: 'visitor.claims.key <cur>',
+            expectedSuggestions: [...SUPPORTED_BINARY_OPERATORS].map((op) => ({
+                type: 'operator',
+                ...op,
+            })),
+        },
+        {
+            expressionWithCursor: 'visitor.claims.flags.FLAG1 <cur>',
+            expectedSuggestions: [
+                ...[...SUPPORTED_BINARY_OPERATORS, ...SUPPORTED_LOGICAL_OPERATORS].filter((op) =>
+                    ['==', '!=', '===', '!==', '&&', '||'].includes(op.operator)
+                ),
+                ...SUPPORTED_CONDITIONAL_OPERATORS,
+            ].map((op) => ({
+                type: 'operator',
+                ...op,
+            })),
+        },
+        {
+            expressionWithCursor: 'visitor.claims.flags.FLAG1 =<cur>',
+            expectedSuggestions: SUPPORTED_BINARY_OPERATORS.filter((op) =>
+                ['==', '==='].includes(op.operator)
+            ).map((op) => ({
+                type: 'operator',
+                ...op,
+            })),
+        },
+        {
+            expressionWithCursor: 'visitor.claims.flags.FLAG1 ==<cur>',
+            expectedSuggestions: SUPPORTED_BINARY_OPERATORS.filter(
+                (op) => op.operator === '==='
+            ).map((op) => ({
+                type: 'operator',
+                ...op,
+            })),
+        },
+        {
+            expressionWithCursor: 'visitor.claims.flags.FLAG1 !<cur>',
+            expectedSuggestions: SUPPORTED_BINARY_OPERATORS.filter((op) =>
+                ['!=', '!=='].includes(op.operator)
+            ).map((op) => ({
+                type: 'operator',
+                ...op,
+            })),
+        },
+        {
+            expressionWithCursor: 'visitor.claims.flags.FLAG1 !=<cur>',
+            expectedSuggestions: SUPPORTED_BINARY_OPERATORS.filter(
+                (op) => op.operator === '!=='
+            ).map((op) => ({
+                type: 'operator',
+                ...op,
+            })),
+        },
+        {
+            expressionWithCursor: 'visitor.claims.flags.FLAG1 == <cur>',
+            expectedSuggestions: [
+                {
+                    type: 'literal-value',
+                    value: { kind: 'direct', type: SymbolType.Boolean, data: true },
+                },
+                {
+                    type: 'literal-value',
+                    value: { kind: 'direct', type: SymbolType.Boolean, data: false },
+                },
+            ],
+        },
+        {
+            expressionWithCursor: 'visitor.claims.flags.FLAG1 == t<cur>',
+            expectedSuggestions: [
+                {
+                    type: 'literal-value',
+                    value: { kind: 'direct', type: SymbolType.Boolean, data: true },
+                },
+            ],
+        },
+        {
+            expressionWithCursor: 'visitor.claims.flags.FLAG1 == tr<cur>',
+            expectedSuggestions: [
+                {
+                    type: 'literal-value',
+                    value: { kind: 'direct', type: SymbolType.Boolean, data: true },
+                },
+            ],
+        },
+        {
+            expressionWithCursor: 'visitor.claims.flags.FLAG1 == true<cur>',
+            expectedSuggestions: [],
+        },
+        {
+            expressionWithCursor: 'visitor.claims.flags.FLAG1 == f<cur>',
+            expectedSuggestions: [
+                {
+                    type: 'literal-value',
+                    value: { kind: 'direct', type: SymbolType.Boolean, data: false },
+                },
+            ],
+        },
+        {
+            expressionWithCursor: 'visitor.claims.flags.FLAG1 == fa<cur>',
+            expectedSuggestions: [
+                {
+                    type: 'literal-value',
+                    value: { kind: 'direct', type: SymbolType.Boolean, data: false },
+                },
+            ],
+        },
+        {
+            expressionWithCursor: 'visitor.claims.flags.FLAG1 == non<cur>',
+            expectedSuggestions: [],
+        },
+        {
+            expressionWithCursor: 'visitor.claims.flags.FLAG1 == false<cur>',
+            expectedSuggestions: [],
+        },
+        {
+            expressionWithCursor: 'visitor.claims.role == <cur>',
+            expectedSuggestions: [
+                {
+                    type: 'literal-value',
+                    value: { kind: 'direct', type: SymbolType.String, data: 'admin' },
+                },
+                {
+                    type: 'literal-value',
+                    value: { kind: 'direct', type: SymbolType.String, data: 'editor' },
+                },
+                {
+                    type: 'literal-value',
+                    value: { kind: 'direct', type: SymbolType.String, data: 'reader' },
+                },
+            ],
+        },
+        {
+            expressionWithCursor: 'visitor.claims.role == ad<cur>',
+            expectedSuggestions: [
+                {
+                    type: 'literal-value',
+                    value: { kind: 'direct', type: SymbolType.String, data: 'admin' },
+                },
+            ],
+        },
+        {
+            expressionWithCursor: 'visitor.claims.role == admin<cur>',
+            expectedSuggestions: [
+                {
+                    type: 'literal-value',
+                    value: { kind: 'direct', type: SymbolType.String, data: 'admin' },
+                },
+            ],
+        },
+        {
+            expressionWithCursor: 'visitor.claims.role == "ad<cur>',
+            expectedSuggestions: [
+                {
+                    type: 'literal-value',
+                    value: { kind: 'direct', type: SymbolType.String, data: 'admin' },
+                },
+            ],
+        },
+        {
+            expressionWithCursor: 'visitor.claims.role == "admin<cur>',
+            expectedSuggestions: [
+                {
+                    type: 'literal-value',
+                    value: { kind: 'direct', type: SymbolType.String, data: 'admin' },
+                },
+            ],
+        },
+        {
+            expressionWithCursor: 'visitor.claims.role == "admin"<cur>',
+            expectedSuggestions: [],
+        },
+        {
+            expressionWithCursor: 'visitor.claims.role == edit<cur>',
+            expectedSuggestions: [
+                {
+                    type: 'literal-value',
+                    value: { kind: 'direct', type: SymbolType.String, data: 'editor' },
+                },
+            ],
+        },
+        {
+            expressionWithCursor: 'visitor.claims.role == "edit<cur>',
+            expectedSuggestions: [
+                {
+                    type: 'literal-value',
+                    value: { kind: 'direct', type: SymbolType.String, data: 'editor' },
+                },
+            ],
+        },
+        {
+            expressionWithCursor: 'visitor.claims.role == editor<cur>',
+            expectedSuggestions: [
+                {
+                    type: 'literal-value',
+                    value: { kind: 'direct', type: SymbolType.String, data: 'editor' },
+                },
+            ],
+        },
+        {
+            expressionWithCursor: 'visitor.claims.role == "editor"<cur>',
+            expectedSuggestions: [],
+        },
+        {
+            expressionWithCursor: 'visitor.claims.hello == <cur>',
+            expectedSuggestions: [],
+        },
+        {
+            expressionWithCursor: 'visitor.claims.hello[1] == <cur>',
+            expectedSuggestions: [
+                {
+                    type: 'literal-value',
+                    value: {
+                        kind: 'in-array',
+                        srcSymbol: visitorClaimsHelloArraySymbol,
+                        matchedLiteralString: '',
+                    },
+                },
+            ],
+        },
+        {
+            expressionWithCursor: 'visitor.claims.hello[1] == "test<cur>',
+            expectedSuggestions: [
+                {
+                    type: 'literal-value',
+                    value: {
+                        kind: 'in-array',
+                        srcSymbol: visitorClaimsHelloArraySymbol,
+                        matchedLiteralString: '"test',
+                    },
+                },
+            ],
+        },
+        {
+            expressionWithCursor: 'visitor.claims.flags.FLAG1 == true <cur>',
+            expectedSuggestions: [
+                ...SUPPORTED_LOGICAL_OPERATORS.filter((op) => ['&&', '||'].includes(op.operator)),
+                ...SUPPORTED_CONDITIONAL_OPERATORS,
+            ].map((op) => ({
+                type: 'operator',
+                ...op,
+            })),
+        },
+        {
+            expressionWithCursor: 'visitor.claims.flags.FLAG1 !== true && v<cur>',
+            expectedSuggestions: [
+                {
+                    type: 'symbol',
+                    symbol: {
+                        definition: SymbolObject({
+                            name: 'visitor',
+                            properties: {
+                                claims: SymbolObject({
+                                    name: 'claims',
+                                    description: 'The claims contained in the visitor JWT token',
+                                    properties: {
+                                        key: SymbolString({ name: 'key' }),
+                                        flags: SymbolObject({
+                                            name: 'flags',
+                                            properties: {
+                                                FLAG1: SymbolBoolean({ name: 'FLAG1' }),
+                                                FLAG2: SymbolBoolean({ name: 'FLAG2' }),
+                                                FLAG3: SymbolBoolean({ name: 'FLAG3' }),
+                                                FLAG4: SymbolBoolean({ name: 'FLAG4' }),
+                                            },
+                                            methods: [],
+                                        }),
+                                        hello: SymbolArray({
+                                            name: 'hello',
+                                            description: 'An array of string',
+                                            items: SymbolString(),
+                                        }),
+                                        role: SymbolString({
+                                            name: 'role',
+                                            enum: ['admin', 'editor', 'reader'],
+                                        }),
+                                    },
+                                    methods: [],
+                                }),
+                            },
+                            methods: [],
+                        }),
+                        ref: 'visitor',
+                        parentRef: undefined,
+                        childrenRefs: ['visitor.claims'],
+                    },
+                },
+            ],
+        },
+        {
+            expressionWithCursor: 'visitor.claims.flags.FLAG1 ? <cur>',
+            expectedSuggestions: [
+                {
+                    type: 'symbol',
+                    symbol: {
+                        definition: SymbolObject({
+                            name: 'visitor',
+                            properties: {
+                                claims: SymbolObject({
+                                    name: 'claims',
+                                    description: 'The claims contained in the visitor JWT token',
+                                    properties: {
+                                        key: SymbolString({ name: 'key' }),
+                                        flags: SymbolObject({
+                                            name: 'flags',
+                                            properties: {
+                                                FLAG1: SymbolBoolean({ name: 'FLAG1' }),
+                                                FLAG2: SymbolBoolean({ name: 'FLAG2' }),
+                                                FLAG3: SymbolBoolean({ name: 'FLAG3' }),
+                                                FLAG4: SymbolBoolean({ name: 'FLAG4' }),
+                                            },
+                                            methods: [],
+                                        }),
+                                        hello: SymbolArray({
+                                            name: 'hello',
+                                            description: 'An array of string',
+                                            items: SymbolString(),
+                                        }),
+                                        role: SymbolString({
+                                            name: 'role',
+                                            enum: ['admin', 'editor', 'reader'],
+                                        }),
+                                    },
+                                    methods: [],
+                                }),
+                            },
+                            methods: [],
+                        }),
+                        ref: 'visitor',
+                        parentRef: undefined,
+                        childrenRefs: ['visitor.claims'],
+                    },
+                },
+            ],
+        },
+        {
+            expressionWithCursor: 'visitor.claims.flags.FLAG1 ? visit<cur>',
+            expectedSuggestions: [
+                {
+                    type: 'symbol',
+                    symbol: {
+                        definition: SymbolObject({
+                            name: 'visitor',
+                            properties: {
+                                claims: SymbolObject({
+                                    name: 'claims',
+                                    description: 'The claims contained in the visitor JWT token',
+                                    properties: {
+                                        key: SymbolString({ name: 'key' }),
+                                        flags: SymbolObject({
+                                            name: 'flags',
+                                            properties: {
+                                                FLAG1: SymbolBoolean({ name: 'FLAG1' }),
+                                                FLAG2: SymbolBoolean({ name: 'FLAG2' }),
+                                                FLAG3: SymbolBoolean({ name: 'FLAG3' }),
+                                                FLAG4: SymbolBoolean({ name: 'FLAG4' }),
+                                            },
+                                            methods: [],
+                                        }),
+                                        hello: SymbolArray({
+                                            name: 'hello',
+                                            description: 'An array of string',
+                                            items: SymbolString(),
+                                        }),
+                                        role: SymbolString({
+                                            name: 'role',
+                                            enum: ['admin', 'editor', 'reader'],
+                                        }),
+                                    },
+                                    methods: [],
+                                }),
+                            },
+                            methods: [],
+                        }),
+                        ref: 'visitor',
+                        parentRef: undefined,
+                        childrenRefs: ['visitor.claims'],
+                    },
+                },
+            ],
+        },
+        {
+            expressionWithCursor: 'visitor.claims.flags.FLAG1 ? visitor.claims.fl<cur>',
+            expectedSuggestions: [
+                {
+                    type: 'symbol',
+                    symbol: {
+                        definition: SymbolObject({
+                            name: 'flags',
+                            properties: {
+                                FLAG1: SymbolBoolean({ name: 'FLAG1' }),
+                                FLAG2: SymbolBoolean({ name: 'FLAG2' }),
+                                FLAG3: SymbolBoolean({ name: 'FLAG3' }),
+                                FLAG4: SymbolBoolean({ name: 'FLAG4' }),
+                            },
+                            methods: [],
+                        }),
+                        ref: 'visitor.claims.flags',
+                        parentRef: 'visitor.claims',
+                        childrenRefs: [
+                            'visitor.claims.flags.FLAG1',
+                            'visitor.claims.flags.FLAG2',
+                            'visitor.claims.flags.FLAG3',
+                            'visitor.claims.flags.FLAG4',
+                        ],
+                    },
+                },
+            ],
+        },
+    ];
+    it.each(SCENARIOS)(
+        'should provide matching suggestion for expression with cursor: $expressionWithCursor',
+        ({ expressionWithCursor, expectedSuggestions }) => {
+            const { expression, cursorOffset } = extractCursorPosition(
+                expressionWithCursor,
+                '<cur>'
+            );
+            const { suggestions } = runtime.autocomplete(expression, cursorOffset, context);
+            expect(suggestions).toStrictEqual(expectedSuggestions);
+        }
+    );
+});
+
+function extractCursorPosition(
+    expressionWithCursor: string,
+    cursorPlaceholder: string
+): { expression: string; cursorOffset: number } {
+    const cursorOffset = expressionWithCursor.indexOf(cursorPlaceholder);
+    if (cursorOffset === -1) {
+        throw new Error(
+            `Cursor position (${cursorPlaceholder}) not found in the expression string.`
+        );
+    }
+
+    const expression = expressionWithCursor.replace(cursorPlaceholder, '');
+    return { expression, cursorOffset };
+}

packages/expr/src/__tests__/input-values.test.ts

@@ -0,0 +1,48 @@
+import { describe, expect, it } from 'bun:test';
+
+import { inferDefaultInputValuesFromObjectJSONSchema } from '../input-values';
+
+describe('inferDefaultInputValuesFromObjectJSONSchema', () => {
+    it('should infer properly the default input value based on the JSON schema of an object', () => {
+        const defaultInputValues = inferDefaultInputValuesFromObjectJSONSchema({
+            type: 'object',
+            properties: {
+                claims: {
+                    type: 'object',
+                    properties: {
+                        key: {
+                            type: 'string',
+                        },
+                        flags: {
+                            type: 'object',
+                            properties: {
+                                FLAG1: { type: 'string' },
+                                FLAG2: { type: 'string' },
+                                FLAG3: { type: 'string' },
+                            },
+                        },
+                        isAlphaUser: {
+                            type: 'boolean',
+                        },
+                        hello: {
+                            type: 'string',
+                            enum: ['enumValue1', 'enumValue2', 'enumValue3'],
+                        },
+                    },
+                },
+            },
+        });
+        expect(defaultInputValues).toMatchObject({
+            claims: {
+                key: 'default',
+                flags: {
+                    FLAG1: 'default',
+                    FLAG2: 'default',
+                    FLAG3: 'default',
+                },
+                isAlphaUser: true,
+                hello: 'enumValue1',
+            },
+        });
+    });
+});

packages/expr/src/__tests__/runtime.test.ts

@@ -0,0 +1,178 @@
+import { describe, expect, it } from 'bun:test';
+
+import { ExpressionError } from '../errors';
+import { ExpressionRuntime } from '../runtime';
+import type { Logger } from '../types';
+
+const SILENT_LOGGER: Logger = {
+    debug: () => {},
+    info: () => {},
+    error: () => {},
+};
+
+describe('ExpressionRuntime', () => {
+    const runtime = new ExpressionRuntime(SILENT_LOGGER);
+
+    describe('evaluate', () => {
+        it.each([
+            {
+                scenario: 'simple condition',
+                condition: 'isBetaUser === true',
+                inputs: { isBetaUser: false },
+                expectedResult: false,
+            },
+            {
+                scenario: 'simple condition with multiple inputs variables',
+                condition: 'useProductA && !isBetaUser',
+                inputs: {
+                    useProductA: true,
+                    isBetaUser: false,
+                },
+                expectedResult: true,
+            },
+            {
+                scenario: 'condition with objects in inputs variables',
+                condition: 'products.includes("productA") && userSegments.alpha',
+                inputs: {
+                    products: ['productA', 'productB'],
+                    userSegments: {
+                        alpha: true,
+                        beta: false,
+                    },
+                },
+                expectedResult: true,
+            },
+            {
+                scenario: 'array method',
+                condition: 'reviews.every(review => !!review.status)',
+                inputs: { reviews: [{ status: 'approved' }, { status: 'approved' }] },
+                expectedResult: true,
+            },
+            {
+                scenario: 'array every',
+                condition: 'reviews.every(review => review.status === "approved")',
+                inputs: { reviews: [{ status: 'approved' }, { status: 'approved' }] },
+                expectedResult: true,
+            },
+            {
+                scenario: 'array map',
+                condition: '[1, 2, 3].map(n => n * x)',
+                inputs: { x: 2 },
+                expectedResult: [2, 4, 6],
+            },
+        ])(
+            'should properly evaluate/safeEvaluate a valid conditional expression: $scenario',
+            ({ condition, inputs, expectedResult }) => {
+                expect(runtime.evaluate(condition, inputs)).toEqual(expectedResult);
+                expect(runtime.safeEvaluate(condition, inputs).value).toEqual(expectedResult);
+            }
+        );
+
+        const INVALID_EXPRESSSIONS = [
+            {
+                scenario: 'invalid syntax',
+                condition: 't}=d',
+                inputs: {},
+            },
+            {
+                scenario: 'non conditional expression',
+                condition: 'const a = 1;',
+                inputs: {},
+            },
+            {
+                scenario: 'unsafe expression',
+                condition: 'while (1) {}',
+                inputs: {},
+            },
+            {
+                scenario: 'unsafe expression',
+                condition: '[1, 2, 3].map(() => { while (1) {}})',
+                inputs: {},
+            },
+        ];
+
+        it.each(INVALID_EXPRESSSIONS)(
+            'should return an object with the error for non conditional expression or syntax errors when using safeEvaluate is on (default): $scenario',
+            ({ condition, inputs }) => {
+                const result = runtime.safeEvaluate(condition, inputs);
+                expect(result.value).toBeUndefined();
+                expect(result.error instanceof ExpressionError).toBe(true);
+            }
+        );
+
+        it.each(INVALID_EXPRESSSIONS)(
+            'should throw an error when using evaluate with invalid expressions',
+            ({ condition, inputs }) => {
+                expect(() => runtime.evaluate(condition, inputs)).toThrowError(ExpressionError);
+            }
+        );
+    });
+
+    describe('parse', () => {
+        it('should produce a valid ESTree compatible AST node for conditional expressions', () => {
+            const ast = runtime.parse('isBetaUser === true');
+
+            expect(ast.result).toEqual({
+                type: 'BinaryExpression',
+                start: 0,
+                end: 19,
+                loc: { start: { line: 1, column: 0 }, end: { line: 1, column: 19 } },
+                left: {
+                    type: 'Identifier',
+                    start: 0,
+                    end: 10,
+                    loc: { start: { line: 1, column: 0 }, end: { line: 1, column: 10 } },
+                    name: 'isBetaUser',
+                },
+                operator: '===',
+                right: {
+                    type: 'Literal',
+                    start: 15,
+                    end: 19,
+                    loc: { start: { line: 1, column: 15 }, end: { line: 1, column: 19 } },
+                    value: true,
+                    raw: 'true',
+                },
+            });
+        });
+
+        it.each([
+            {
+                scenario: 'invalid syntax',
+                condition: 't}=d',
+            },
+            {
+                scenario: 'non conditional expression',
+                condition: 'const a = 1;',
+            },
+        ])(
+            'should throw an error for non conditional expressions or syntax errors: $scenario',
+            ({ condition }) => {
+                expect(() => runtime.parse(condition)).toThrowError(ExpressionError);
+            }
+        );
+    });
+
+    describe.skip('generate', () => {
+        it.each([
+            {
+                scenario: 'simple condition',
+                condition: 'isBetaUser === true',
+            },
+            {
+                scenario: 'simple condition with multiple inputs variables',
+                condition: 'useProductA && !isBetaUser',
+            },
+            {
+                scenario: 'condition with objects in inputs variables',
+                condition: 'products.includes("productA") && userSegments.alpha',
+            },
+        ])(
+            'should produce the original expression using an AST node produced by parse: $scenario',
+            ({ condition }) => {
+                const { result } = runtime.parse(condition);
+                expect(runtime.generate(result)).toStrictEqual(condition);
+            }
+        );
+    });
+});

packages/expr/src/__tests__/template.test.ts

@@ -0,0 +1,35 @@
+import { describe, expect, it } from 'bun:test';
+
+import { ExpressionRuntime, parseTemplate } from '../';
+
+describe('template expressions', () => {
+    it('should parse template into parts', () => {
+        const parts = parseTemplate('Hello {{ user.name }}!');
+        expect(parts).toEqual([
+            { type: 'text', value: 'Hello ', start: 0, end: 6 },
+            { type: 'expression', value: 'user.name', start: 8, end: 19 },
+            { type: 'text', value: '!', start: 21, end: 22 },
+        ]);
+    });
+
+    it('should parse template starting with an expression', () => {
+        const parts = parseTemplate('{{ user.name }} is cool');
+        expect(parts).toEqual([
+            { type: 'expression', value: 'user.name', start: 2, end: 13 },
+            { type: 'text', value: ' is cool', start: 15, end: 23 },
+        ]);
+    });
+
+    it('should parse template without expressions', () => {
+        const parts = parseTemplate('Hello world');
+        expect(parts).toEqual([{ type: 'text', value: 'Hello world', start: 0, end: 11 }]);
+    });
+
+    it('should evaluate template', () => {
+        const runtime = new ExpressionRuntime();
+        const result = runtime.evaluateTemplate('Hello {{ user.name }}!', {
+            user: { name: 'John' },
+        });
+        expect(result).toBe('Hello John!');
+    });
+});

packages/expr/src/autocomplete.ts

@@ -0,0 +1,568 @@
+import type {
+    Node as AcornNode,
+    AnyNode,
+    BinaryExpression,
+    Expression,
+    Identifier,
+    Literal,
+    MemberExpression,
+    PrivateIdentifier,
+    Super,
+} from 'acorn';
+import { isDummy } from 'acorn-loose';
+import * as walk from 'acorn-walk';
+
+import assertNever from 'assert-never';
+
+import { type ExtractSymbolDef, SymbolType, SymbolsTable } from './symbols';
+import {
+    type AutocompleteLiteralValueSuggestion,
+    type AutocompleteOperatorSuggestion,
+    type AutocompleteSuggestions,
+    type AutocompleteSymbolSuggestion,
+    type DirectLiteralValueSuggestion,
+    type ExpressionParserResult,
+    type Logger,
+    SUPPORTED_BINARY_OPERATORS,
+    SUPPORTED_CONDITIONAL_OPERATORS,
+    SUPPORTED_LOGICAL_OPERATORS,
+} from './types';
+
+interface ExpressionParser {
+    parse(expr: string, options: { loose?: boolean }): ExpressionParserResult;
+}
+
+export class AutoComplete {
+    #parser: ExpressionParser;
+    #logger: Logger;
+
+    constructor(parser: ExpressionParser, logger: Logger = console) {
+        this.#parser = parser;
+        this.#logger = logger;
+    }
+
+    /**
+     * Generates autocomplete suggestions based on the input expression and cursor offset position.
+     */
+    public getSuggestions(
+        expr: string,
+        cursorOffset: number,
+        context: SymbolsTable
+    ): AutocompleteSuggestions {
+        if (!expr.length) {
+            return [];
+        }
+
+        try {
+            const { result, invalidNodes } = this.#parser.parse(expr, { loose: true });
+
+            // Locate the node at the cursor position.
+            const nodeAtCursorFound = walk.findNodeAround(result, cursorOffset, (_type, node) =>
+                isNodeAtCursor(node, cursorOffset)
+            );
+
+            if (!nodeAtCursorFound) {
+                // When we can't find one we might be in the boundary of the program/expression.
+                // We could possibly be in a whitespace at the end of the expression or in a situation where the parsed
+                // tree may contain 2 top level ExpressionStatement (second one returned as invalid node by the parser).
+                //
+                // In this case we want to provide operators as suggestions and refine the search of the "cursor" node to either:
+                //   - using the end position of the whole expression AST (e.g white space at the very end of the expression string)
+                //   - or using the second top level ExpressionStatement node found by the parser as the cursor is at the end of that node.
+                if (cursorOffset > result.end) {
+                    const ast = invalidNodes.length > 0 ? invalidNodes[0]?.expression : result;
+
+                    if (!ast) {
+                        return [];
+                    }
+
+                    const lastNodeFound = walk.findNodeAround(ast, ast.end, (_type, node) =>
+                        isNodeAtCursor(node, ast.end)
+                    );
+                    if (!lastNodeFound) {
+                        return [];
+                    }
+                    const { node } = lastNodeFound;
+
+                    if (!isAnyNode(node)) {
+                        throw Error(`Unexpected node type ${node.type}`);
+                    }
+
+                    return this.getOperatorSuggestionsForNode(ast, node, result.end, context);
+                }
+                return [];
+            }
+
+            const { node } = nodeAtCursorFound;
+
+            if (!isAnyNode(node)) {
+                throw Error(`Unexpected node type ${node.type}`);
+            }
+
+            return this.getSuggestionsForNode(result, node, expr, cursorOffset, context);
+        } catch (error) {
+            this.#logger.error('Error while computing autocomplete suggestions', error);
+            return [];
+        }
+    }
+
+    /**
+     * Provides autocomplete suggestions for a specific node in the AST.
+     */
+    private getSuggestionsForNode(
+        ast: Expression,
+        node: AnyNode,
+        expr: string,
+        cursorOffset: number,
+        context: SymbolsTable
+    ): AutocompleteSuggestions {
+        // When the node is an identifier look up the parent to get more context for the suggestions.
+        let inferNode: AnyNode = node;
+        if (node.type === 'Identifier' || node.type === 'Literal') {
+            const parent = findParentNode(node, ast);
+            inferNode =
+                parent &&
+                !['ExpressionStatement', 'LogicalExpression', 'ConditionalExpression'].includes(
+                    parent.type
+                )
+                    ? parent
+                    : node;
+        }
+
+        switch (inferNode.type) {
+            case 'Identifier':
+            case 'MemberExpression': {
+                const pathParts = this.getSymbolsPathPartsForMemberExpressionNode(
+                    inferNode,
+                    cursorOffset
+                );
+
+                // Fetch suggestions from the symbol table
+                const candidatesKeys = context.getMatchingSymbolsKeys(pathParts);
+
+                const suggestions: AutocompleteSymbolSuggestion[] = [];
+                for (const candidate of candidatesKeys) {
+                    const symbolInfo = context.getSymbolInfo(candidate);
+                    if (symbolInfo) {
+                        suggestions.push({ type: 'symbol', symbol: symbolInfo });
+                    }
+                }
+
+                if (suggestions.length === 1) {
+                    const lastPathSegment = pathParts.at(-1)?.replace(/\*$/, '');
+
+                    // Return no suggestion when the only match is an exact match of the
+                    // typed token.
+                    return lastPathSegment !== suggestions[0]?.symbol.definition.name
+                        ? suggestions
+                        : [];
+                }
+
+                return suggestions;
+            }
+            case 'AssignmentExpression':
+            case 'UnaryExpression': {
+                // Provide suggestions for binary or logical operators based on the parsed operator
+                // of the partial expression (e.g suggest "==" when typing "=" (parsed as AssignmentExpression)).
+                return this.getOperatorSuggestionsForNode(ast, inferNode, cursorOffset, context);
+            }
+            case 'BinaryExpression': {
+                const { left, right } = inferNode;
+
+                const isOperatorBinaryOp = SUPPORTED_BINARY_OPERATORS.some(
+                    (op) => op.operator === inferNode.operator
+                );
+
+                const operatorIndex = expr.indexOf(inferNode.operator, left.end);
+                const operatorOffset = operatorIndex + inferNode.operator.length;
+                const isCursorAfterOperator = cursorOffset > operatorOffset;
+
+                const shouldSuggestValues =
+                    isCursorAfterOperator &&
+                    isOperatorBinaryOp &&
+                    isNodeAtCursor(right, cursorOffset);
+
+                if (shouldSuggestValues) {
+                    return this.getLiteralValueSuggestionsForNode(inferNode, cursorOffset, context);
+                }
+
+                // Provide suggestions for binary operators based on the parsed operator
+                return this.getOperatorSuggestionsForNode(ast, inferNode, cursorOffset, context);
+            }
+            case 'ConditionalExpression': {
+                const { consequent, alternate } = inferNode;
+
+                if (isNodeAtCursor(consequent, cursorOffset)) {
+                    return this.getSuggestionsForNode(ast, consequent, expr, cursorOffset, context);
+                }
+
+                if (isNodeAtCursor(alternate, cursorOffset)) {
+                    return this.getSuggestionsForNode(ast, alternate, expr, cursorOffset, context);
+                }
+            }
+        }
+
+        return [];
+    }
+
+    /**
+     * Return a path corresponding to the MemberExpression node that can be used to lookup matching symbols in the symbol table.
+     */
+    private getSymbolsPathPartsForMemberExpressionNode(
+        node: MemberExpression | Identifier,
+        cursorOffset: number,
+        options?: { withWildcardMatches: boolean }
+    ): string[] {
+        const withWildcardMatches = options?.withWildcardMatches ?? true;
+        const pathParts: string[] = [];
+
+        switch (node.type) {
+            case 'MemberExpression':
+                {
+                    const memberProperty = node.property;
+
+                    // Only support identifier or literal expressions as member properties.
+                    if (!isSupportedMemberProperty(memberProperty)) {
+                        return [];
+                    }
+
+                    // Push the path part corresponding to the member property (e.g b in a.b or a['b'])
+                    const propertyPathPart = this.getSymbolsPathPartFromMemberProperty(
+                        memberProperty,
+                        cursorOffset
+                    );
+
+                    if (propertyPathPart) {
+                        pathParts.push(
+                            withWildcardMatches ? `${propertyPathPart}*` : propertyPathPart
+                        );
+                    }
+
+                    // Go through the parent(s) in the chain and add their path parts as well
+                    let parent: Expression | Super | undefined = node.object;
+                    while (parent) {
+                        const parentProperty = 'property' in parent ? parent.property : parent;
+
+                        // Only support identifier or literal expressions as parent property.
+                        const parentPropertyPathPart = isSupportedMemberProperty(parentProperty)
+                            ? this.getSymbolsPathPartFromMemberProperty(
+                                  parentProperty,
+                                  cursorOffset
+                              )
+                            : undefined;
+
+                        if (parentPropertyPathPart) {
+                            pathParts.unshift(parentPropertyPathPart);
+                        }
+
+                        parent = 'object' in parent ? parent.object : undefined;
+                    }
+                }
+                break;
+            case 'Identifier': {
+                const propertyPathPart = this.getSymbolsPathPartFromMemberProperty(
+                    node,
+                    cursorOffset
+                );
+                if (propertyPathPart) {
+                    pathParts.push(withWildcardMatches ? `${propertyPathPart}*` : propertyPathPart);
+                }
+                break;
+            }
+            default:
+                assertNever(node);
+        }
+
+        return pathParts;
+    }
+
+    /**
+     * Return a part of a symbol path corresponding to a MemberExpression node property.
+     */
+    private getSymbolsPathPartFromMemberProperty(
+        node: Identifier | Literal,
+        cursorOffset: number
+    ): string {
+        switch (node.type) {
+            case 'Identifier': {
+                if (isDummy(node)) {
+                    return '*';
+                }
+
+                return isNodeAtCursor(node, cursorOffset)
+                    ? node.name.slice(0, cursorOffset)
+                    : node.name;
+            }
+            case 'Literal': {
+                if (isDummy(node) || !node.value) {
+                    return '*';
+                }
+                const value = String(node.value);
+                return isNodeAtCursor(node, cursorOffset) ? value.slice(0, cursorOffset) : value;
+            }
+            default:
+                assertNever(node);
+        }
+    }
+
+    /**
+     * Provides autocomplete literal value suggestions for a specific node in the AST.
+     */
+    private getLiteralValueSuggestionsForNode(
+        node: BinaryExpression,
+        cursorOffset: number,
+        context: SymbolsTable
+    ): Array<AutocompleteLiteralValueSuggestion> {
+        const { left, right } = node;
+
+        if (left.type !== 'MemberExpression' && left.type !== 'Identifier') {
+            return [];
+        }
+
+        if (right.type !== 'Identifier' && right.type !== 'Literal') {
+            return [];
+        }
+
+        const leftSymbolPath = this.getSymbolsPathPartsForMemberExpressionNode(left, cursorOffset, {
+            withWildcardMatches: false,
+        });
+
+        const isLeftComputedMember = left.type === 'MemberExpression' && left.computed;
+        const leftSymbolInfo = context.getSymbolInfo(
+            isLeftComputedMember ? leftSymbolPath.slice(0, -1) : leftSymbolPath
+        );
+
+        if (!leftSymbolInfo) {
+            return [];
+        }
+
+        switch (leftSymbolInfo.definition.type) {
+            case SymbolType.Boolean: {
+                const suggestions: DirectLiteralValueSuggestion[] = [
+                    {
+                        type: 'literal-value',
+                        value: { kind: 'direct', type: SymbolType.Boolean, data: true },
+                    },
+                    {
+                        type: 'literal-value',
+                        value: { kind: 'direct', type: SymbolType.Boolean, data: false },
+                    },
+                ];
+
+                return isDummy(right)
+                    ? suggestions
+                    : suggestions.filter((literalValue) => {
+                          const literalValueString = String(literalValue.value.data);
+                          const rightNodeValue =
+                              right.type === 'Identifier' ? right.name : (right.raw ?? '');
+                          return (
+                              literalValueString !== rightNodeValue &&
+                              literalValueString.startsWith(rightNodeValue)
+                          );
+                      });
+            }
+            case SymbolType.String: {
+                if (!leftSymbolInfo.definition.enum) {
+                    return [];
+                }
+
+                const rightNodeValue = (() => {
+                    if (right.type === 'Identifier') {
+                        return right.name;
+                    }
+
+                    const nodeValue = right.raw ?? '';
+                    if (/^(['"])(.*)\1$/.test(nodeValue)) {
+                        return null;
+                    }
+
+                    return nodeValue.replaceAll(/["']/g, '');
+                })();
+
+                if (rightNodeValue === null) {
+                    return [];
+                }
+
+                const suggestions = isDummy(right)
+                    ? leftSymbolInfo.definition.enum
+                    : leftSymbolInfo.definition.enum.filter((enumValue) =>
+                          enumValue.startsWith(rightNodeValue)
+                      );
+
+                return suggestions.map((value) => ({
+                    type: 'literal-value',
+                    value: {
+                        kind: 'direct',
+                        type: SymbolType.String,
+                        data: value,
+                    },
+                }));
+            }
+            case SymbolType.Array: {
+                // Only return a literal in array value suggestion when the left hand side of the binary expression
+                // is computed, e.g myArray[1]
+                return isLeftComputedMember
+                    ? [
+                          {
+                              type: 'literal-value',
+                              value: {
+                                  kind: 'in-array',
+                                  srcSymbol: leftSymbolInfo.definition,
+                                  matchedLiteralString: !isDummy(right)
+                                      ? right.type === 'Identifier'
+                                          ? right.name
+                                          : (right.raw ?? '')
+                                      : '',
+                              },
+                          },
+                      ]
+                    : [];
+            }
+            default:
+                return [];
+        }
+    }
+
+    /**
+     * Provides autocomplete operator suggestions for a specific node in the AST.
+     */
+    private getOperatorSuggestionsForNode(
+        ast: Expression,
+        node: AnyNode,
+        cursorOffset: number,
+        context: SymbolsTable
+    ): Array<AutocompleteOperatorSuggestion> {
+        if (node.type === 'Literal') {
+            const parent = findParentNode(node, ast);
+
+            if (parent?.type === 'BinaryExpression') {
+                return [...SUPPORTED_LOGICAL_OPERATORS, ...SUPPORTED_CONDITIONAL_OPERATORS].map(
+                    (op) => ({
+                        type: 'operator',
+                        ...op,
+                    })
+                );
+            }
+
+            const literalSymbol = SymbolsTable.inferSymbolFromValue(node.raw);
+            return this.getOperatorSuggestionsForSymbol(literalSymbol);
+        }
+
+        // When the node is an identifier look the parent to get more context for the suggestions
+        let inferNode: AnyNode = node;
+        if (node.type === 'Identifier') {
+            const parent = findParentNode(node, ast);
+            inferNode = parent && parent.type !== 'ExpressionStatement' ? parent : node;
+        }
+
+        switch (inferNode.type) {
+            case 'MemberExpression': {
+                const pathParts = this.getSymbolsPathPartsForMemberExpressionNode(
+                    inferNode,
+                    cursorOffset,
+                    {
+                        withWildcardMatches: false,
+                    }
+                );
+                const symbolInfo = context.getSymbolInfo(pathParts);
+                return symbolInfo
+                    ? this.getOperatorSuggestionsForSymbol(symbolInfo.definition)
+                    : [];
+            }
+            case 'AssignmentExpression':
+            case 'BinaryExpression':
+            case 'UnaryExpression': {
+                // Starting to write a binary/logical operator so suggest operator matching the already
+                // typed character as operator.
+                const operator = inferNode.operator;
+                return (
+                    [...SUPPORTED_BINARY_OPERATORS, ...SUPPORTED_LOGICAL_OPERATORS]
+                        .filter((op) => op.operator.startsWith(operator))
+                        // No need to include the operator that match exactly
+                        .filter((op) => op.operator !== operator)
+                        .map((op) => ({
+                            type: 'operator',
+                            ...op,
+                        }))
+                );
+            }
+            default:
+                return [];
+        }
+    }
+
+    /**
+     * Provides autocomplete operator suggestions based on the type of a symbol.
+     */
+    private getOperatorSuggestionsForSymbol(
+        symbol: ExtractSymbolDef<SymbolType>
+    ): Array<AutocompleteOperatorSuggestion> {
+        switch (symbol.type) {
+            case SymbolType.Number:
+            case SymbolType.Boolean:
+            case SymbolType.Null:
+            case SymbolType.Undefined:
+            case SymbolType.Object:
+            case SymbolType.Array: {
+                const equalityOps = SUPPORTED_BINARY_OPERATORS.slice(0, 4);
+                const finalSuggestions =
+                    symbol.type === SymbolType.Boolean
+                        ? [
+                              ...equalityOps,
+                              ...SUPPORTED_LOGICAL_OPERATORS,
+                              ...SUPPORTED_CONDITIONAL_OPERATORS,
+                          ]
+                        : equalityOps;
+                return finalSuggestions.map((op) => ({
+                    type: 'operator',
+                    ...op,
+                }));
+            }
+            case SymbolType.String:
+                return SUPPORTED_BINARY_OPERATORS.map((op) => ({
+                    type: 'operator',
+                    ...op,
+                }));
+            case SymbolType.Function:
+                return this.getOperatorSuggestionsForSymbol(symbol.returns);
+            case SymbolType.Union: {
+                return symbol.members.reduce<Array<AutocompleteOperatorSuggestion>>((prev, cur) => {
+                    prev.push(...this.getOperatorSuggestionsForSymbol(cur));
+                    return prev;
+                }, []);
+            }
+            default:
+                assertNever(symbol);
+        }
+    }
+}
+
+/**
+ * Finds the parent of child node in the provided AST.
+ */
+function findParentNode(child: AnyNode, ast: Expression): AnyNode | undefined {
+    let foundParent: AnyNode | undefined;
+
+    walk.ancestor(ast, {
+        [child.type]: (node: AcornNode, _state: undefined, ancestors: AnyNode[]) => {
+            if (node.start === child.start && node.end === child.end) {
+                // The parent is the second last ancestor in the stack (last one is the actual node)
+                foundParent = ancestors[ancestors.length - 2];
+            }
+        },
+    });
+
+    return foundParent;
+}
+
+function isSupportedMemberProperty(node: Expression | PrivateIdentifier | Super) {
+    return node.type === 'Identifier' || node.type === 'Literal';
+}
+
+function isNodeAtCursor(node: AcornNode, cursorOffset: number) {
+    return cursorOffset >= node.start && cursorOffset <= node.end;
+}
+
+function isAnyNode(node: AcornNode): node is AnyNode {
+    return 'type' in node;
+}

packages/expr/src/errors.ts

@@ -0,0 +1,24 @@
+import type { Position, Token } from 'acorn';
+
+export class ExpressionError extends Error {
+    /**
+     * The location of the error in the parsed expression.
+     */
+    public location?: Position | null;
+
+    /**
+     * The expression token with the error
+     */
+    public token?: Token;
+
+    constructor(message: string, loc?: Position | null, token?: Token) {
+        super(message);
+
+        if (Error.captureStackTrace) {
+            Error.captureStackTrace(this, ExpressionError);
+        }
+        this.name = 'ExpressionError';
+        this.location = loc;
+        this.token = token;
+    }
+}

packages/expr/src/index.ts

@@ -0,0 +1,7 @@
+export * from './errors';
+export * from './input-values';
+export * from './runtime';
+export * from './symbols';
+export * from './template';
+export * from './types';
+export * from './utils';

packages/expr/src/input-values.ts

@@ -0,0 +1,77 @@
+import type { JSONSchema7 } from 'json-schema';
+import { filterOutNullable } from './utils';
+
+type InputValuesType =
+    | null
+    | string
+    | number
+    | boolean
+    | { [key: string]: InputValuesType }
+    | InputValuesType[];
+
+/**
+ * Infers a default inputValues object based on the JSON schema of an object.
+ */
+export function inferDefaultInputValuesFromObjectJSONSchema(
+    schema: JSONSchema7
+): Record<string, InputValuesType> {
+    if (schema.type !== 'object' || !schema.properties) {
+        throw new Error(`Expected schema of object to be provided: ${schema.type}`);
+    }
+
+    const result: Record<string, InputValuesType> = {};
+
+    for (const [key, propertySchema] of Object.entries(schema.properties)) {
+        if (typeof propertySchema === 'boolean') {
+            continue;
+        }
+
+        result[key] = inferDefaultInputValueFromJSONSchema(propertySchema);
+    }
+
+    return result;
+}
+
+function inferDefaultInputValueFromJSONSchema(schema: JSONSchema7): InputValuesType {
+    switch (schema.type) {
+        case 'object':
+            return inferDefaultInputValuesFromObjectJSONSchema(schema);
+        case 'array': {
+            if (schema.items && Array.isArray(schema.items)) {
+                return schema.items.map((itemSchema) => {
+                    if (typeof itemSchema === 'boolean') {
+                        return false;
+                    }
+                    return inferDefaultInputValueFromJSONSchema(itemSchema);
+                });
+            }
+            return [];
+        }
+        case 'string':
+        case 'number':
+        case 'integer':
+        case 'boolean':
+        case 'null':
+            return inferDefaultInputValueFromPrimitive(schema);
+        default:
+            throw new Error(`Unsupported schema type: ${schema.type}`);
+    }
+}
+
+function inferDefaultInputValueFromPrimitive(schema: JSONSchema7): InputValuesType {
+    switch (schema.type) {
+        case 'boolean':
+            return true;
+        case 'number':
+        case 'integer':
+            return 1234;
+        case 'string': {
+            const enumValues = schema.enum?.filter(filterOutNullable);
+            return enumValues?.[0] ?? 'default';
+        }
+        case 'null':
+            return null;
+        default:
+            throw new Error(`Unsupported schema type: ${schema.type}`);
+    }
+}

packages/expr/src/runtime.ts

@@ -0,0 +1,289 @@
+import {
+    type Options as AcornOptions,
+    type Expression,
+    type ExpressionStatement,
+    type Position,
+    type Program,
+    type Token,
+    parse,
+    tokenizer,
+} from 'acorn';
+import { parse as parseLoose } from 'acorn-loose';
+import escodegen from 'escodegen';
+import evalESTreeExpr from 'eval-estree-expression';
+const { evaluate } = evalESTreeExpr;
+
+import { AutoComplete } from './autocomplete';
+import { ExpressionError } from './errors';
+import type { SymbolsTable } from './symbols';
+import type { TemplatePart } from './template';
+import { parseTemplate as parseTemplateParts } from './template';
+import type { ExpressionAutocompleteResults, ExpressionParserResult, Logger } from './types';
+import { formatExpressionResult } from './utils';
+
+export class ExpressionRuntime {
+    #parserOptions: AcornOptions;
+    #autocompleter: AutoComplete;
+    #logger: Logger;
+
+    constructor(logger: Logger = console) {
+        this.#parserOptions = {
+            ecmaVersion: 'latest',
+            sourceType: 'script',
+            allowHashBang: false,
+            locations: true,
+        };
+        this.#autocompleter = new AutoComplete(this, logger);
+        this.#logger = logger;
+    }
+
+    /**
+     * Evaluates an expression based on the given inputs/context.
+     */
+    public evaluate(expr: string, inputs: object): unknown {
+        try {
+            const parsed = this.parse(expr);
+
+            if (parsed.invalidNodes.length > 0) {
+                throw new ExpressionError('Invalid nodes found when parsing');
+            }
+
+            return evaluate.sync<Expression>(parsed.result, inputs, {
+                functions: true,
+                withMembers: true,
+                generate: escodegen.generate,
+            });
+        } catch (error) {
+            throw error instanceof Error
+                ? new ExpressionError(error.message)
+                : new ExpressionError('Unexpected error');
+        }
+    }
+
+    /**
+     * Evaluates an expression safely by returning the error instead of throwing when invalid.
+     */
+    public safeEvaluate(
+        expr: string,
+        inputs: object
+    ): { value: unknown; error?: undefined } | { value?: undefined; error: ExpressionError } {
+        try {
+            const value = this.evaluate(expr, inputs);
+            return {
+                value,
+            };
+        } catch (error) {
+            this.#logger.error(`Error while evaluating expression ${expr}`, error);
+
+            if (error instanceof ExpressionError) {
+                return {
+                    value: undefined,
+                    error,
+                };
+            }
+
+            return {
+                value: undefined,
+                error:
+                    error instanceof Error
+                        ? new ExpressionError(error.message)
+                        : new ExpressionError('Unexpected error'),
+            };
+        }
+    }
+
+    /**
+     * Evaluates a condition safely to a boolean.
+     */
+    public evaluateBoolean(expr: string, inputs: object): boolean {
+        if (expr.trim().length === 0) {
+            return true;
+        }
+
+        const evalResult = this.safeEvaluate(expr, inputs);
+
+        if (typeof evalResult.error !== 'undefined') {
+            return false;
+        }
+
+        return Boolean(evalResult.value);
+    }
+
+    /**
+     * Evaluates an array of conditions as a single logical expression.
+     * The function treats the conditions as if they were joined by an AND operator,
+     * meaning the evaluation returns `true` only if all conditions are truthy.
+     */
+    public evaluateBooleanAll(expressions: string[], inputs: object): boolean {
+        if (expressions.length === 0) {
+            return true;
+        }
+
+        return expressions.every((expression) => this.evaluateBoolean(expression, inputs));
+    }
+
+    /**
+     * Parse a template and validate all embedded expressions.
+     */
+    public parseTemplate(template: string): { parts: TemplatePart[]; errors: ExpressionError[] } {
+        const parts = parseTemplateParts(template);
+        const errors: ExpressionError[] = [];
+
+        for (const part of parts) {
+            if (part.type === 'expression') {
+                try {
+                    const { invalidNodes } = this.parse(part.value);
+                    if (invalidNodes.length > 0) {
+                        errors.push(new ExpressionError('Invalid expression'));
+                    }
+                } catch (error) {
+                    errors.push(error as ExpressionError);
+                }
+            }
+        }
+
+        return { parts, errors };
+    }
+
+    /**
+     * Evaluate a template string containing `{{ expression }}` placeholders.
+     */
+    public evaluateTemplate(template: string, inputs: object): string {
+        const { parts } = this.parseTemplate(template);
+
+        return parts
+            .map((part) => {
+                if (part.type === 'text') {
+                    return part.value;
+                }
+                const result = this.evaluate(part.value, inputs);
+                return formatExpressionResult(result, '');
+            })
+            .join('');
+    }
+
+    /**
+     * Parses a binary expression and returns an @ExpressionParserResult.
+     */
+    public parse(
+        expr: string,
+        options: { loose?: boolean } = {
+            loose: false,
+        }
+    ): ExpressionParserResult {
+        try {
+            const ast = options.loose
+                ? parseLoose(expr, { ...this.#parserOptions })
+                : parse(expr, { ...this.#parserOptions });
+
+            if (!ast.body || ast.body.length === 0) {
+                throw new ExpressionError('Empty or invalid expression');
+            }
+
+            // Extract the first expression statement that we find
+            const firstExprIndex = ast.body.findIndex((node) => isParsedExpressionStatement(node));
+            const [statement] = ast.body.splice(firstExprIndex, 1);
+
+            if (!statement || !isParsedExpressionStatement(statement)) {
+                throw new ExpressionError('Empty or invalid expression');
+            }
+
+            // Return information on the other nodes as invalid nodes
+            const invalidNodes = ast.body.filter(filterOutModuleDeclarationStatement);
+
+            return {
+                result: statement.expression,
+                invalidNodes,
+            };
+        } catch (error) {
+            if (error instanceof SyntaxError) {
+                throw createExpressionErrorFromSyntaxError(expr, error);
+            }
+            if (error instanceof ExpressionError) {
+                throw error;
+            }
+            throw new ExpressionError('Unexpected error');
+        }
+    }
+
+    /**
+     * Provides autocomplete suggestions for the given expression at the provided cursor offset.
+     */
+    public autocomplete(
+        expr: string,
+        cursorOffset: number,
+        context: SymbolsTable
+    ): ExpressionAutocompleteResults {
+        const suggestions = this.#autocompleter.getSuggestions(expr, cursorOffset, context);
+
+        return { suggestions };
+    }
+
+    public generate(_node: Expression): string {
+        throw new Error('Not yet implemented');
+    }
+}
+
+function createExpressionErrorFromSyntaxError(
+    code: string,
+    error: SyntaxError & { loc?: Position }
+): ExpressionError {
+    const loc = error.loc;
+
+    if (!loc) {
+        return new ExpressionError(error.message);
+    }
+
+    const errorMessage = `${error.message.replace(/\s*\(\d+:\d+\)$/, '')} at ${code.split('\n').length > 1 ? `line ${loc.line}, ` : ''}char ${loc.column}`;
+    const token = getTokenAtLoc(code, loc);
+
+    if (!token) {
+        return new ExpressionError(errorMessage, loc);
+    }
+
+    return new ExpressionError(errorMessage, loc, token);
+}
+function getTokenAtLoc(code: string, errorLoc: Position): Token | undefined {
+    const tokens = tokenizer(code, {
+        ecmaVersion: 'latest',
+        locations: true,
+    });
+
+    try {
+        for (const token of tokens) {
+            if (!token.loc) {
+                continue;
+            }
+
+            const { start, end } = token.loc;
+
+            const onSameLine = errorLoc.line === start.line;
+            const inColumnRange = errorLoc.column >= start.column && errorLoc.column < end.column;
+
+            if (onSameLine && inColumnRange) {
+                return token;
+            }
+        }
+    } catch (_error) {
+        return undefined;
+    }
+
+    return undefined;
+}
+
+function isParsedExpressionStatement(
+    statement: Program['body'][number]
+): statement is ExpressionStatement {
+    return statement.type === 'ExpressionStatement';
+}
+
+export function filterOutModuleDeclarationStatement(
+    statement: Program['body'][number]
+): statement is ExpressionStatement {
+    return ![
+        'ImportDeclaration',
+        'ExportNamedDeclaration',
+        'ExportDefaultDeclaration',
+        'ExportAllDeclaration',
+    ].includes(statement.type);
+}

packages/expr/src/symbols/__tests__/symbols.test.ts

@@ -0,0 +1,497 @@
+import { describe, expect, it } from 'bun:test';
+
+import { SymbolArray, SymbolObject, SymbolString } from '../symbols';
+import { SymbolsTable } from '../symbols-table';
+import type { SymbolType } from '../types';
+
+describe('ExpressionRuntime', () => {
+    const initialSymbols = {
+        visitor: SymbolObject({
+            name: 'visitor',
+            properties: {
+                claims: SymbolObject({
+                    name: 'claims',
+                    description: 'The claims contained in the visitor JWT token',
+                    properties: {
+                        key: SymbolString({ name: 'key' }),
+                        flags: SymbolObject({
+                            name: 'flags',
+                            properties: {
+                                FLAG1: SymbolString({ name: 'FLAG1' }),
+                                FLAG2: SymbolString({ name: 'FLAG2' }),
+                                FLAG3: SymbolString({ name: 'FLAG3' }),
+                            },
+                            methods: [],
+                        }),
+                        hello: SymbolArray({
+                            name: 'hello',
+                            description: 'An array of string',
+                            items: SymbolString(),
+                        }),
+                    },
+                    methods: [],
+                }),
+            },
+            methods: [],
+        }),
+    };
+    describe('addSymbols', () => {
+        it('should the symbols matching the provided object to the table', () => {
+            const symbolsTable = new SymbolsTable(initialSymbols);
+
+            expect(symbolsTable.getSymbolInfo(['visitor'])).toMatchObject({
+                definition: {
+                    type: 'object',
+                    name: 'visitor',
+                    properties: {
+                        claims: {
+                            type: 'object',
+                            name: 'claims',
+                            description: 'The claims contained in the visitor JWT token',
+                            properties: {
+                                key: {
+                                    type: 'string',
+                                    name: 'key',
+                                },
+                                flags: {
+                                    type: 'object',
+                                    name: 'flags',
+                                    properties: {
+                                        FLAG1: {
+                                            type: 'string',
+                                            name: 'FLAG1',
+                                        },
+                                        FLAG2: {
+                                            type: 'string',
+                                            name: 'FLAG2',
+                                        },
+                                        FLAG3: {
+                                            type: 'string',
+                                            name: 'FLAG3',
+                                        },
+                                    },
+                                    methods: [],
+                                },
+                                hello: {
+                                    type: 'array',
+                                    name: 'hello',
+                                    description: 'An array of string',
+                                    items: {
+                                        type: 'string',
+                                    },
+                                },
+                            },
+                            methods: [],
+                        },
+                    },
+                    methods: [],
+                },
+                ref: 'visitor',
+                childrenRefs: ['visitor.claims'],
+            });
+
+            symbolsTable.addSymbols({
+                space: SymbolObject({
+                    name: 'space',
+                    properties: {
+                        id: SymbolString({ name: 'id' }),
+                        title: SymbolString({ name: 'title' }),
+                    },
+                    methods: [],
+                }),
+            });
+
+            expect(symbolsTable.getSymbolInfo(['space'])).toMatchObject({
+                definition: {
+                    type: 'object',
+                    name: 'space',
+                    properties: {
+                        id: {
+                            type: 'string',
+                            name: 'id',
+                        },
+                        title: {
+                            type: 'string',
+                            name: 'title',
+                        },
+                    },
+                    methods: [],
+                },
+                ref: 'space',
+                childrenRefs: ['space.id', 'space.title'],
+            });
+        });
+    });
+
+    describe('Symbols standard library', () => {
+        it('should allow to access methods & properties defined as part of the standard library', () => {
+            const symbolsTable = new SymbolsTable({
+                id: SymbolString({ name: 'id' }),
+                title: SymbolString({ name: 'title' }),
+            });
+
+            expect(
+                symbolsTable.getSymbolInfo<SymbolType.String>('id')?.definition.properties.length
+            ).toMatchObject({
+                type: 'number',
+                name: 'length',
+                description:
+                    'The length data property of a String value contains the length of the string in UTF-16 code units.',
+            });
+        });
+    });
+
+    describe('getSymbolInfo', () => {
+        it('should add the symbols matching the initial symbol definition passed to the constructor', () => {
+            const symbolsTable = new SymbolsTable(initialSymbols);
+
+            expect(symbolsTable.getSymbolInfo(['visitor'])).toMatchObject({
+                definition: {
+                    type: 'object',
+                    name: 'visitor',
+                    properties: {
+                        claims: {
+                            type: 'object',
+                            name: 'claims',
+                            description: 'The claims contained in the visitor JWT token',
+                            properties: {
+                                key: {
+                                    type: 'string',
+                                    name: 'key',
+                                },
+                                flags: {
+                                    type: 'object',
+                                    name: 'flags',
+                                    properties: {
+                                        FLAG1: {
+                                            type: 'string',
+                                            name: 'FLAG1',
+                                        },
+                                        FLAG2: {
+                                            type: 'string',
+                                            name: 'FLAG2',
+                                        },
+                                        FLAG3: {
+                                            type: 'string',
+                                            name: 'FLAG3',
+                                        },
+                                    },
+                                    methods: [],
+                                },
+                                hello: {
+                                    type: 'array',
+                                    name: 'hello',
+                                    description: 'An array of string',
+                                    items: {
+                                        type: 'string',
+                                    },
+                                },
+                            },
+                            methods: [],
+                        },
+                    },
+                    methods: [],
+                },
+                ref: 'visitor',
+                childrenRefs: ['visitor.claims'],
+            });
+
+            expect(symbolsTable.getSymbolInfo(['visitor', 'claims'])).toMatchObject({
+                definition: {
+                    type: 'object',
+                    name: 'claims',
+                    description: 'The claims contained in the visitor JWT token',
+                    properties: {
+                        key: {
+                            type: 'string',
+                            name: 'key',
+                        },
+                        flags: {
+                            type: 'object',
+                            name: 'flags',
+                            properties: {
+                                FLAG1: {
+                                    type: 'string',
+                                    name: 'FLAG1',
+                                },
+                                FLAG2: {
+                                    type: 'string',
+                                    name: 'FLAG2',
+                                },
+                                FLAG3: {
+                                    type: 'string',
+                                    name: 'FLAG3',
+                                },
+                            },
+                            methods: [],
+                        },
+                        hello: {
+                            type: 'array',
+                            name: 'hello',
+                            description: 'An array of string',
+                            items: {
+                                type: 'string',
+                            },
+                        },
+                    },
+                    methods: [],
+                },
+                ref: 'visitor.claims',
+                parentRef: 'visitor',
+                childrenRefs: [
+                    'visitor.claims.key',
+                    'visitor.claims.flags',
+                    'visitor.claims.hello',
+                ],
+            });
+
+            expect(symbolsTable.getSymbolInfo(['visitor', 'claims', 'key'])).toMatchObject({
+                definition: {
+                    type: 'string',
+                    name: 'key',
+                },
+                ref: 'visitor.claims.key',
+                parentRef: 'visitor.claims',
+                childrenRefs: [
+                    'visitor.claims.key.length',
+                    'visitor.claims.key.at',
+                    'visitor.claims.key.endsWith',
+                    'visitor.claims.key.includes',
+                ],
+            });
+
+            expect(symbolsTable.getSymbolInfo(['visitor', 'claims', 'flags'])).toMatchObject({
+                definition: {
+                    type: 'object',
+                    name: 'flags',
+                    properties: {
+                        FLAG1: {
+                            type: 'string',
+                            name: 'FLAG1',
+                        },
+                        FLAG2: {
+                            type: 'string',
+                            name: 'FLAG2',
+                        },
+                        FLAG3: {
+                            type: 'string',
+                            name: 'FLAG3',
+                        },
+                    },
+                    methods: [],
+                },
+                ref: 'visitor.claims.flags',
+                parentRef: 'visitor.claims',
+                childrenRefs: [
+                    'visitor.claims.flags.FLAG1',
+                    'visitor.claims.flags.FLAG2',
+                    'visitor.claims.flags.FLAG3',
+                ],
+            });
+
+            expect(
+                symbolsTable.getSymbolInfo(['visitor', 'claims', 'flags', 'FLAG1'])
+            ).toMatchObject({
+                definition: {
+                    type: 'string',
+                    name: 'FLAG1',
+                },
+                ref: 'visitor.claims.flags.FLAG1',
+                parentRef: 'visitor.claims.flags',
+                childrenRefs: [
+                    'visitor.claims.flags.FLAG1.length',
+                    'visitor.claims.flags.FLAG1.at',
+                    'visitor.claims.flags.FLAG1.endsWith',
+                    'visitor.claims.flags.FLAG1.includes',
+                ],
+            });
+
+            expect(
+                symbolsTable.getSymbolInfo(['visitor', 'claims', 'flags', 'FLAG2'])
+            ).toMatchObject({
+                definition: {
+                    type: 'string',
+                    name: 'FLAG2',
+                },
+                ref: 'visitor.claims.flags.FLAG2',
+                parentRef: 'visitor.claims.flags',
+                childrenRefs: [
+                    'visitor.claims.flags.FLAG2.length',
+                    'visitor.claims.flags.FLAG2.at',
+                    'visitor.claims.flags.FLAG2.endsWith',
+                    'visitor.claims.flags.FLAG2.includes',
+                ],
+            });
+
+            expect(symbolsTable.getSymbolInfo(['visitor', 'claims', 'hello'])).toMatchObject({
+                definition: {
+                    type: 'array',
+                    name: 'hello',
+                    description: 'An array of string',
+                    items: {
+                        type: 'string',
+                    },
+                },
+                ref: 'visitor.claims.hello',
+                parentRef: 'visitor.claims',
+                childrenRefs: [
+                    'visitor.claims.hello.length',
+                    'visitor.claims.hello.at',
+                    'visitor.claims.hello.includes',
+                    'visitor.claims.hello.some',
+                    'visitor.claims.hello.every',
+                ],
+            });
+        });
+    });
+
+    describe('inferSymbolFromValue', () => {
+        it('should infer properly a symbol based on a value', () => {
+            const symbolDef = SymbolsTable.inferSymbolFromValue(
+                {
+                    visitor: {
+                        claims: {
+                            key: 'test',
+                            flags: {
+                                FLAG1: 'testflag1',
+                                FLAG2: 'testflag2',
+                                FLAG3: 'testflag3',
+                            },
+                            hello: ['test', 'test1', 'test2'],
+                        },
+                    },
+                },
+                'context'
+            );
+            expect(symbolDef).toMatchObject({
+                type: 'object',
+                name: 'context',
+                properties: {
+                    visitor: {
+                        type: 'object',
+                        name: 'visitor',
+                        properties: {
+                            claims: {
+                                type: 'object',
+                                name: 'claims',
+                                properties: {
+                                    key: {
+                                        type: 'string',
+                                        name: 'key',
+                                    },
+                                    flags: {
+                                        type: 'object',
+                                        name: 'flags',
+                                        properties: {
+                                            FLAG1: {
+                                                type: 'string',
+                                                name: 'FLAG1',
+                                            },
+                                            FLAG2: {
+                                                type: 'string',
+                                                name: 'FLAG2',
+                                            },
+                                            FLAG3: {
+                                                type: 'string',
+                                                name: 'FLAG3',
+                                            },
+                                        },
+                                        methods: [],
+                                    },
+                                    hello: {
+                                        type: 'array',
+                                        name: 'hello',
+                                        items: {
+                                            type: 'string',
+                                        },
+                                    },
+                                },
+                                methods: [],
+                            },
+                        },
+                        methods: [],
+                    },
+                },
+                methods: [],
+            });
+        });
+    });
+
+    describe('inferSymbolFromJSONSchema', () => {
+        it('should infer properly a symbol table based on a JSON schema', () => {
+            const symbolDef = SymbolsTable.inferSymbolFromJSONSchema(
+                {
+                    type: 'object',
+                    description: `The attributes tied to a site's visitor.`,
+                    properties: {
+                        claims: {
+                            type: 'object',
+                            properties: {
+                                key: {
+                                    type: 'string',
+                                },
+                                flags: {
+                                    type: 'object',
+                                    description: 'The user feature flags',
+                                    properties: {
+                                        FLAG1: { type: 'string' },
+                                        FLAG2: { type: 'string' },
+                                        FLAG3: { type: 'string' },
+                                    },
+                                },
+                                hello: {
+                                    type: 'string',
+                                    enum: ['test', 'test1', 'test2'],
+                                },
+                            },
+                        },
+                    },
+                },
+                'visitor'
+            );
+            expect(symbolDef).toMatchObject({
+                type: 'object',
+                name: 'visitor',
+                description: `The attributes tied to a site's visitor.`,
+                properties: {
+                    claims: {
+                        type: 'object',
+                        name: 'claims',
+                        properties: {
+                            key: {
+                                type: 'string',
+                                name: 'key',
+                            },
+                            flags: {
+                                type: 'object',
+                                name: 'flags',
+                                description: 'The user feature flags',
+                                properties: {
+                                    FLAG1: {
+                                        type: 'string',
+                                        name: 'FLAG1',
+                                    },
+                                    FLAG2: {
+                                        type: 'string',
+                                        name: 'FLAG2',
+                                    },
+                                    FLAG3: {
+                                        type: 'string',
+                                        name: 'FLAG3',
+                                    },
+                                },
+                                methods: [],
+                            },
+                            hello: {
+                                type: 'string',
+                                enum: ['test', 'test1', 'test2'],
+                            },
+                        },
+                        methods: [],
+                    },
+                },
+                methods: [],
+            });
+        });
+    });
+});

packages/expr/src/symbols/index.ts

@@ -0,0 +1,3 @@
+export * from './symbols';
+export * from './symbols-table';
+export * from './types';

packages/expr/src/symbols/symbols-table.ts

@@ -0,0 +1,350 @@
+import type { JSONSchema7 } from 'json-schema';
+
+import { filterOutNullable } from '../utils';
+import {
+    SymbolArray,
+    SymbolBoolean,
+    SymbolNull,
+    SymbolNumber,
+    SymbolObject,
+    SymbolString,
+    SymbolUndefined,
+} from './symbols';
+import {
+    type ExtractSymbolDef,
+    type GenericSymbolDef,
+    type ObjectSymbolDef,
+    SymbolType,
+    type SymbolWithMethods,
+    type SymbolWithProperties,
+    resolveSymbolDef,
+} from './types';
+
+export interface SymbolInfo<T extends SymbolType = SymbolType> {
+    /**
+     * Definition of the symbol.
+     */
+    definition: ExtractSymbolDef<T>;
+
+    /**
+     * Reference of the symbol in the table of symbols.
+     */
+    ref: string;
+
+    /**
+     * Stores the reference to the parent symbol.
+     */
+    parentRef?: string;
+
+    /**
+     * Stores the reference to the children symbols.
+     */
+    childrenRefs?: string[];
+}
+
+export class SymbolError extends Error {
+    constructor(message: string) {
+        super(message);
+
+        if (Error.captureStackTrace) {
+            Error.captureStackTrace(this, SymbolError);
+        }
+        this.name = 'SymbolError';
+    }
+}
+
+export class SymbolsTable {
+    /**
+     * Internal table that keeps track of all symbols reference.
+     */
+    #table: Record<string, SymbolInfo>;
+
+    /**
+     * Internal table that keep track of the raw symbols definitions.
+     */
+    #rawSymbols: Record<string, GenericSymbolDef>;
+
+    constructor(initialContext: Record<string, GenericSymbolDef> = {}) {
+        this.#table = {};
+        this.#rawSymbols = {};
+        this.addSymbols(initialContext);
+    }
+
+    /**
+     * Create a new symbols table by merging the current one with the provided one.
+     */
+    merge(other: SymbolsTable): SymbolsTable {
+        return new SymbolsTable({
+            ...this.#rawSymbols,
+            ...other.#rawSymbols,
+        });
+    }
+
+    toString() {
+        return JSON.stringify(this.#table, null, 2);
+    }
+
+    /**
+     * Infer the symbol of a value and generate the appropriate symbol definition.
+     */
+    static inferSymbolFromValue(value: unknown, name?: string): ExtractSymbolDef<SymbolType> {
+        if (Array.isArray(value)) {
+            if (value.length === 0) {
+                return SymbolArray({ items: SymbolUndefined() });
+            }
+
+            const firstItemSymbol = SymbolsTable.inferSymbolFromValue(value.at(0));
+            // Check that the array is not a mixin of different items types.
+            if (value.length > 1) {
+                const secondItemSymbol = SymbolsTable.inferSymbolFromValue(value.at(1));
+                if (firstItemSymbol.type !== secondItemSymbol.type) {
+                    throw new SymbolError('Array with mixin items types are not supported');
+                }
+            }
+            return SymbolArray({ name, items: firstItemSymbol });
+        }
+
+        if (typeof value === 'undefined') {
+            return SymbolUndefined({ name });
+        }
+
+        if (value === null) {
+            return SymbolNull({ name });
+        }
+
+        const valueType = typeof value;
+        switch (valueType) {
+            case 'string':
+                return SymbolString({ name });
+            case 'number':
+                return SymbolNumber({ name });
+            case 'boolean':
+                return SymbolBoolean({ name });
+            case 'object': {
+                const properties = Object.entries(value).reduce<Record<string, GenericSymbolDef>>(
+                    (prev, [name, val]) => {
+                        prev[name] = SymbolsTable.inferSymbolFromValue(val, name);
+                        return prev;
+                    },
+                    {}
+                );
+                return SymbolObject({ name, properties, methods: [] });
+            }
+            default:
+                throw new SymbolError(`Unsupported symbol type ${valueType}`);
+        }
+    }
+
+    /**
+     * Infer a table of symbol based on a JSON schema object describing it.
+     */
+    static inferSymbolFromJSONSchema(
+        schema: JSONSchema7,
+        name?: string
+    ): ExtractSymbolDef<SymbolType> {
+        switch (schema.type) {
+            case 'string':
+                return SymbolString({
+                    name,
+                    ...(schema.description ? { description: schema.description } : {}),
+                    ...(schema.enum
+                        ? {
+                              enum: schema.enum
+                                  .filter(filterOutNullable)
+                                  .map((enumValue) => enumValue.toString()),
+                          }
+                        : {}),
+                });
+            case 'number':
+            case 'integer':
+                return SymbolNumber({
+                    name,
+                    ...(schema.description ? { description: schema.description } : {}),
+                });
+            case 'boolean':
+                return SymbolBoolean({
+                    name,
+                    ...(schema.description ? { description: schema.description } : {}),
+                });
+            case 'null':
+                return SymbolNull({
+                    name,
+                    ...(schema.description ? { description: schema.description } : {}),
+                });
+            case 'object':
+                return SymbolsTable.#buildObjectSymbolFromJSONSchemaObject(schema, name);
+            case 'array':
+                return SymbolsTable.#buildArraySymbolFromJSONSchemaArray(schema, name);
+            default:
+                throw new Error(`Unsupported schema type: ${schema.type}`);
+        }
+    }
+
+    static #buildObjectSymbolFromJSONSchemaObject(
+        schema: JSONSchema7,
+        name?: string
+    ): ObjectSymbolDef {
+        const properties: Record<string, GenericSymbolDef> = {};
+
+        if (schema.properties) {
+            Object.entries(schema.properties).forEach(([propertyName, propertySchema]) => {
+                properties[propertyName] = SymbolsTable.inferSymbolFromJSONSchema(
+                    propertySchema as JSONSchema7,
+                    propertyName
+                );
+            });
+        }
+
+        return SymbolObject({
+            name,
+            properties,
+            ...(schema.description ? { description: schema.description } : {}),
+            methods: [],
+        });
+    }
+
+    static #buildArraySymbolFromJSONSchemaArray(
+        schema: JSONSchema7,
+        name?: string
+    ): ExtractSymbolDef<SymbolType.Array> {
+        if (schema.items) {
+            const itemSymbol = SymbolsTable.inferSymbolFromJSONSchema(
+                schema.items as JSONSchema7,
+                `${name || ''}_item`
+            );
+            return SymbolArray({
+                name,
+                ...(schema.description ? { description: schema.description } : {}),
+                items: itemSymbol,
+            });
+        }
+
+        return SymbolArray({
+            name,
+            ...(schema.description ? { description: schema.description } : {}),
+            items: SymbolUndefined(),
+        });
+    }
+
+    private generateSymbolRefPath(path: string[]): string {
+        return path.join('.');
+    }
+
+    /**
+     * Add a single symbol to the table at the provided path.
+     */
+    private addSymbol(path: string[], definition: GenericSymbolDef, raw = false): void {
+        const fullPath = this.generateSymbolRefPath(path);
+        const parentPath = path.slice(0, -1).join('.');
+
+        if (this.#table[fullPath]) {
+            throw new SymbolError(`Symbol "${fullPath}" already exists.`);
+        }
+
+        if (raw) {
+            this.#rawSymbols[fullPath] = definition;
+        }
+
+        // Add the new symbol linking it to its parent
+        this.#table[fullPath] = {
+            definition: resolveSymbolDef(definition),
+            ref: fullPath,
+            parentRef: parentPath || undefined,
+            childrenRefs: [],
+        };
+
+        if (parentPath && this.#table[parentPath]) {
+            if (this.#table[parentPath].childrenRefs) {
+                this.#table[parentPath].childrenRefs.push(fullPath);
+            }
+        }
+
+        // Add any nested symbols if the value is a symbol with properties...
+        if (isSymbolWithProperties(definition)) {
+            Object.entries(definition.properties).forEach(([propKey, propSymbol]) => {
+                if (isObjectSymbol(propSymbol)) {
+                    this.addSymbols({ [propKey]: propSymbol }, path, false);
+                } else {
+                    this.addSymbol([...path, propKey], propSymbol, false);
+                }
+            });
+        }
+
+        // ...or a symbol with methods
+        if (isSymbolWithMethods(definition)) {
+            definition.methods.forEach((methodSymbol) => {
+                this.addSymbol([...path, methodSymbol.name], methodSymbol, false);
+            });
+        }
+    }
+
+    /**
+     * Add the provided object of symbols definitions to the symbol table.
+     */
+    public addSymbols(
+        symbols: Record<string, GenericSymbolDef>,
+        prefix: string[] = [],
+        raw = true
+    ): void {
+        for (const [key, symbolDef] of Object.entries(symbols)) {
+            const path = [...prefix, key];
+
+            // Add the current symbol to the table.
+            this.addSymbol(path, symbolDef, raw);
+        }
+    }
+
+    /**
+     * Get a symbol's information using its path in the table.
+     */
+    public getSymbolInfo<T extends SymbolType>(path: string | string[]): SymbolInfo<T> | undefined {
+        const key = Array.isArray(path) ? path.join('.') : path;
+        const info = this.#table[key];
+        return info ? typedSymbolInfo(info) : undefined;
+    }
+
+    /**
+     * Get all symbol keys matching the pattern defined by the provided path.
+     */
+    public getMatchingSymbolsKeys(path: string[]): string[] {
+        const wildcardRegex = new RegExp(
+            `^${path
+                .map((segment) => {
+                    if (segment.includes('*')) {
+                        return `${segment.split('*')[0]}([^.]+)?`;
+                    }
+                    return segment;
+                })
+                .join('\\.')}$`
+        );
+
+        return Object.keys(this.#table)
+            .filter((key) => wildcardRegex.test(key))
+            .filter(filterOutNullable);
+    }
+}
+
+function isObjectSymbol(symbol: GenericSymbolDef): symbol is ObjectSymbolDef {
+    return symbol.type === SymbolType.Object;
+}
+
+function isSymbolWithProperties(symbol: GenericSymbolDef): symbol is SymbolWithProperties {
+    return (
+        symbol.type === SymbolType.Object ||
+        symbol.type === SymbolType.Array ||
+        symbol.type === SymbolType.String
+    );
+}
+
+function isSymbolWithMethods(symbol: GenericSymbolDef): symbol is SymbolWithMethods {
+    return (
+        symbol.type === SymbolType.Object ||
+        symbol.type === SymbolType.Array ||
+        symbol.type === SymbolType.String
+    );
+}
+
+function typedSymbolInfo<T extends SymbolType>(info: SymbolInfo): SymbolInfo<T> {
+    const definition = resolveSymbolDef(info.definition);
+    return { ...info, definition } as SymbolInfo<T>;
+}

packages/expr/src/symbols/symbols.ts

@@ -0,0 +1,322 @@
+import {
+    type ArraySymbolDef,
+    type BooleanSymbolDef,
+    type ExtractSymbolDef,
+    type FunctionSymbolDef,
+    type GenericSymbolDef,
+    type NullSymbolDef,
+    type NumberSymbolDef,
+    type ObjectSymbolDef,
+    type StringSymbolDef,
+    SymbolType,
+    type SymbolsWithPropertiesAndMethods,
+    type UndefinedSymbolDef,
+    type UnionSymbolDef,
+} from './types';
+
+export function SymbolBoolean(args: Omit<BooleanSymbolDef, 'type'> = {}): BooleanSymbolDef {
+    return {
+        type: SymbolType.Boolean,
+        ...args,
+    };
+}
+
+export function SymbolNumber(args: Omit<NumberSymbolDef, 'type'> = {}): NumberSymbolDef {
+    return {
+        type: SymbolType.Number,
+        ...args,
+    };
+}
+
+export function SymbolString(
+    args: Omit<StringSymbolDef, 'type' | 'methods' | 'properties'> = {}
+): StringSymbolDef {
+    return createSymbolWithPropertiesAndMethods<StringSymbolDef>(SymbolType.String, args);
+}
+
+export function SymbolObject(args: Omit<ObjectSymbolDef, 'type'>): ObjectSymbolDef {
+    return {
+        type: SymbolType.Object,
+        ...args,
+    };
+}
+
+export function SymbolArray(
+    args: Omit<ArraySymbolDef, 'type' | 'methods' | 'properties'>
+): ArraySymbolDef {
+    return createSymbolWithPropertiesAndMethods(SymbolType.Array, args);
+}
+
+export function SymbolFunction(args: Omit<FunctionSymbolDef, 'type'>): FunctionSymbolDef {
+    return {
+        type: SymbolType.Function,
+        ...args,
+    };
+}
+
+export function OptionalFunctionArg(
+    optionalArg: ExtractSymbolDef<SymbolType>
+): ExtractSymbolDef<SymbolType> & { optional: true } {
+    return {
+        ...optionalArg,
+        optional: true,
+    };
+}
+
+export function SymbolUnion(args: Omit<UnionSymbolDef, 'type'>): UnionSymbolDef {
+    return {
+        type: SymbolType.Union,
+        ...args,
+    };
+}
+
+export function SymbolUndefined(args: Omit<UndefinedSymbolDef, 'type'> = {}): UndefinedSymbolDef {
+    return {
+        type: SymbolType.Undefined,
+        ...args,
+    };
+}
+
+export function SymbolNull(args: Omit<NullSymbolDef, 'type'> = {}): NullSymbolDef {
+    return {
+        type: SymbolType.Null,
+        ...args,
+    };
+}
+
+function createSymbolWithPropertiesAndMethods<
+    T extends SymbolsWithPropertiesAndMethods & { type: SymbolType },
+>(type: T['type'], args: Omit<T, 'type' | 'methods' | 'properties'>): T {
+    const symbol = { type, ...args } as T;
+
+    Object.defineProperty(symbol, 'properties', {
+        get() {
+            if (symbol.type === SymbolType.Array) {
+                return isArraySymbol(symbol)
+                    ? StandardLibrary[SymbolType.Array]?.(symbol).properties
+                    : {};
+            }
+            return StandardLibrary[symbol.type]?.properties || {};
+        },
+    });
+
+    Object.defineProperty(symbol, 'methods', {
+        get() {
+            if (symbol.type === SymbolType.Array) {
+                return isArraySymbol(symbol)
+                    ? StandardLibrary[SymbolType.Array]?.(symbol).methods
+                    : [];
+            }
+            return StandardLibrary[symbol.type]?.methods || [];
+        },
+    });
+
+    return symbol;
+}
+
+// TODO-ADAPTIVE-CONTENT: extend the definition of the supported standard library methods and properties.
+
+const StandardLibrary: Partial<
+    {
+        [key in Exclude<SymbolType, SymbolType.Array>]: {
+            properties: Record<string, GenericSymbolDef>;
+            methods: FunctionSymbolDef[];
+        };
+    } & {
+        [SymbolType.Array]: (symbol: ArraySymbolDef) => {
+            properties: Record<string, GenericSymbolDef>;
+            methods: FunctionSymbolDef[];
+        };
+    }
+> = {
+    [SymbolType.String]: {
+        properties: {
+            length: SymbolNumber({
+                name: 'length',
+                description:
+                    'The length data property of a String value contains the length of the string in UTF-16 code units.',
+                link: 'https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/String/length',
+            }),
+        },
+        methods: [
+            SymbolFunction({
+                name: 'at',
+                description: `Takes an integer value and returns the item at that index, allowing for positive and negative integers.
+            Negative integers count back from the last item in the string.`,
+                link: 'https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/String/at',
+                args: [
+                    SymbolNumber({
+                        name: 'index',
+                        description: 'The index (position) of the string character to be returned',
+                    }),
+                ],
+                returns: SymbolUnion({
+                    description: `A String consisting of the single UTF-16 code unit located at the specified position.
+                Returns undefined if the given index can not be found.`,
+                    members: [SymbolString(), SymbolUndefined()],
+                }),
+            }),
+            SymbolFunction({
+                name: 'endsWith',
+                description: `Returns true if the sequence of elements of searchString converted to a String is the same as the corresponding 
+            elements of this object (converted to a String) starting at endPosition – length(this). Otherwise returns false.`,
+                link: 'https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/String/endsWith',
+                args: [
+                    SymbolString({
+                        name: 'searchString',
+                        description: `The characters to be searched for at the end of str. Cannot be a regex.
+                    All values that are not regexes are coerced to strings, so omitting it or passing undefined causes endsWith() to search for 
+                    the string "undefined", which is rarely what you want.`,
+                    }),
+                    OptionalFunctionArg(
+                        SymbolNumber({
+                            name: 'endPosition',
+                            description: `The end position at which searchString is expected to be found 
+                    (the index of searchString's last character plus 1). Defaults to str.length.`,
+                        })
+                    ),
+                ],
+                returns: SymbolBoolean({
+                    description: `true if the given characters are found at the end of the string, including when searchString is an empty string; 
+                otherwise, false.`,
+                }),
+            }),
+            SymbolFunction({
+                name: 'includes',
+                description: `Returns true if searchString appears as a substring of the result of converting this object to a String, at one or more positions 
+            that are greater than or equal to position; otherwise, returns false.`,
+                link: 'https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/String/includes',
+                args: [
+                    SymbolString({
+                        name: 'searchString',
+                        description: `A string to be searched for within str. Cannot be a regex. All values that are not regexes are coerced to strings, so omitting it 
+                or passing undefined causes includes() to search for the string "undefined", which is rarely what you want.`,
+                    }),
+                    OptionalFunctionArg(
+                        SymbolNumber({
+                            name: 'position',
+                            description:
+                                'The position within the string at which to begin searching for searchString. (Defaults to 0.)',
+                        })
+                    ),
+                ],
+                returns: SymbolBoolean({
+                    description: `true if the search string is found anywhere within the given string, including when searchString is an empty string; 
+                otherwise, false.`,
+                }),
+            }),
+        ],
+    },
+    [SymbolType.Array]: (arraySymbolDef: ArraySymbolDef) => ({
+        properties: {
+            length: SymbolNumber({
+                name: 'length',
+                description: `The length data property of an Array instance represents the number of elements in that array.
+                The value is an unsigned, 32-bit integer that is always numerically greater than the highest index in the array.`,
+                link: 'https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Array/length',
+            }),
+        },
+        methods: [
+            SymbolFunction({
+                name: 'at',
+                description: `Takes an integer value and returns the item at that index, allowing for positive and negative integers. 
+                Negative integers count back from the last item in the array.`,
+                link: 'https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Array/at',
+                args: [
+                    SymbolNumber({
+                        name: 'index',
+                        description: `Zero-based index of the array element to be returned, converted to an integer. 
+                        Negative index counts back from the end of the array — if index < 0, index + array.length is accessed.`,
+                    }),
+                ],
+                returns: SymbolUnion({
+                    description: `The element in the array matching the given index. Always returns undefined if index < -array.length or index >= array.length 
+                    without attempting to access the corresponding property.`,
+                    members: [arraySymbolDef.items, SymbolUndefined()],
+                }),
+            }),
+            SymbolFunction({
+                name: 'includes',
+                description:
+                    'Determines whether an array includes a certain value among its entries, returning true or false as appropriate.',
+                link: 'https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Array/includes',
+                args: [
+                    {
+                        ...arraySymbolDef.items,
+                        name: 'searchElement',
+                        description: 'The value to be searched for within the array.',
+                    },
+                    OptionalFunctionArg(
+                        SymbolNumber({
+                            name: 'fromIndex',
+                            description:
+                                'The position within the string at which to begin searching for searchString. (Defaults to 0.)',
+                        })
+                    ),
+                ],
+                returns: SymbolBoolean({
+                    description:
+                        'true if the value searchElement is found within the array (or the part of the array indicated by the index fromIndex, if specified).',
+                }),
+            }),
+            SymbolFunction({
+                name: 'some',
+                description:
+                    'Tests whether at least one element in the array passes the test implemented by the provided function.',
+                link: 'https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Array/some',
+                args: [
+                    SymbolFunction({
+                        name: 'callback',
+                        description: 'A function that tests each element of the array.',
+                        args: [
+                            {
+                                ...arraySymbolDef.items,
+                                name: 'element',
+                                description: 'The current element being processed in the array.',
+                            },
+                        ],
+                        returns: SymbolBoolean({
+                            description:
+                                'true if the callback function returns a truthy value for at least one element in the array.',
+                        }),
+                    }),
+                ],
+                returns: SymbolBoolean({
+                    description:
+                        'true if the callback function returns a truthy value for at least one element in the array.',
+                }),
+            }),
+            SymbolFunction({
+                name: 'every',
+                description:
+                    'Tests whether all elements in the array pass the test implemented by the provided function.',
+                link: 'https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Array/every',
+                args: [
+                    SymbolFunction({
+                        name: 'callback',
+                        description: 'A function that tests each element of the array.',
+                        args: [
+                            {
+                                ...arraySymbolDef.items,
+                                name: 'element',
+                                description: 'The current element being processed in the array.',
+                            },
+                        ],
+                        returns: SymbolBoolean({
+                            description:
+                                'true if the callback function returns a truthy value for all elements in the array.',
+                        }),
+                    }),
+                ],
+                returns: SymbolBoolean({
+                    description:
+                        'true if the callback function returns a truthy value for all elements in the array.',
+                }),
+            }),
+        ],
+    }),
+};
+
+function isArraySymbol(symbol: GenericSymbolDef): symbol is ArraySymbolDef {
+    return symbol.type === SymbolType.Array;
+}

packages/expr/src/symbols/types.ts

@@ -0,0 +1,193 @@
+import type { MandateProps } from '../utils';
+
+export enum SymbolType {
+    Boolean = 'boolean',
+    Number = 'number',
+    String = 'string',
+    Object = 'object',
+    Array = 'array',
+    Function = 'function',
+    Union = 'union',
+    Undefined = 'undefined',
+    Null = 'null',
+}
+
+export interface SymbolMetadata {
+    /**
+     * Long description of the symbol.
+     */
+    description?: string;
+
+    /**
+     * Link to a documentation/manual page.
+     */
+    link?: string;
+}
+
+export interface GenericSymbolDef extends SymbolMetadata {
+    /**
+     * Type of the symbol.
+     */
+    type: SymbolType;
+
+    /**
+     * Name of the symbol.
+     */
+    name?: string;
+}
+
+export interface SymbolWithProperties extends GenericSymbolDef {
+    /**
+     * Properties on the symbol type.
+     */
+    properties: Record<string, GenericSymbolDef>;
+}
+
+export interface SymbolWithMethods extends GenericSymbolDef {
+    /**
+     * Methods that can be called on the symbol type.
+     */
+    methods: FunctionSymbolDef[];
+}
+
+export interface BooleanSymbolDef extends GenericSymbolDef {
+    type: SymbolType.Boolean;
+}
+
+export interface NumberSymbolDef extends GenericSymbolDef {
+    type: SymbolType.Number;
+}
+
+export interface StringSymbolDef extends SymbolWithProperties, SymbolWithMethods {
+    type: SymbolType.String;
+
+    /**
+     * Set of enumerated values that the string symbol is retristred to.
+     */
+    enum?: string[];
+
+    /**
+     * Properties on strings.
+     */
+    properties: {
+        length: NumberSymbolDef;
+    };
+}
+
+export interface ObjectSymbolDef extends SymbolWithProperties, SymbolWithMethods {
+    type: SymbolType.Object;
+}
+
+export interface ArraySymbolDef extends SymbolWithProperties, SymbolWithMethods {
+    type: SymbolType.Array;
+
+    /**
+     * Symbol representing the type of the items of the array
+     */
+    items: ExtractSymbolDef<SymbolType>;
+
+    /**
+     * Properties on arrays.
+     */
+    properties: {
+        length: NumberSymbolDef;
+    };
+}
+
+export interface FunctionSymbolDef extends MandateProps<GenericSymbolDef, 'name'> {
+    type: SymbolType.Function;
+
+    /**
+     * Symbols describing the arguments of the function.
+     */
+    args: (ExtractSymbolDef<SymbolType> & { optional?: boolean })[];
+
+    /**
+     * Symbol describing the returned value of the function.
+     */
+    returns: ExtractSymbolDef<SymbolType>;
+}
+
+export interface UnionSymbolDef extends GenericSymbolDef {
+    type: SymbolType.Union;
+
+    /**
+     * Symbols composing the union.
+     */
+    members: ExtractSymbolDef<SymbolType>[];
+}
+
+export interface UndefinedSymbolDef extends GenericSymbolDef {
+    type: SymbolType.Undefined;
+}
+
+export interface NullSymbolDef extends GenericSymbolDef {
+    type: SymbolType.Null;
+}
+
+export type SymbolsWithPropertiesAndMethods = ArraySymbolDef | ObjectSymbolDef | StringSymbolDef;
+
+export type ExtractSymbolDef<T extends SymbolType> = T extends SymbolType.String
+    ? StringSymbolDef
+    : T extends SymbolType.Number
+      ? NumberSymbolDef
+      : T extends SymbolType.Boolean
+        ? BooleanSymbolDef
+        : T extends SymbolType.Array
+          ? ArraySymbolDef
+          : T extends SymbolType.Object
+            ? ObjectSymbolDef
+            : T extends SymbolType.Function
+              ? FunctionSymbolDef
+              : T extends SymbolType.Union
+                ? UnionSymbolDef
+                : T extends SymbolType.Undefined
+                  ? UndefinedSymbolDef
+                  : T extends SymbolType.Null
+                    ? NullSymbolDef
+                    : never;
+
+export function resolveSymbolDef(
+    symbol: GenericSymbolDef
+):
+    | StringSymbolDef
+    | NumberSymbolDef
+    | BooleanSymbolDef
+    | ArraySymbolDef
+    | ObjectSymbolDef
+    | FunctionSymbolDef
+    | UnionSymbolDef
+    | UndefinedSymbolDef
+    | NullSymbolDef {
+    switch (symbol.type) {
+        case SymbolType.String:
+            return symbol as StringSymbolDef;
+
+        case SymbolType.Number:
+            return symbol as NumberSymbolDef;
+
+        case SymbolType.Boolean:
+            return symbol as BooleanSymbolDef;
+
+        case SymbolType.Array:
+            return symbol as ArraySymbolDef;
+
+        case SymbolType.Object:
+            return symbol as ObjectSymbolDef;
+
+        case SymbolType.Function:
+            return symbol as FunctionSymbolDef;
+
+        case SymbolType.Union:
+            return symbol as UnionSymbolDef;
+
+        case SymbolType.Undefined:
+            return symbol as UndefinedSymbolDef;
+
+        case SymbolType.Null:
+            return symbol as NullSymbolDef;
+
+        default:
+            throw new Error(`Unknown symbol type: ${symbol.type}`);
+    }
+}

packages/expr/src/template.ts

@@ -0,0 +1,57 @@
+export type TemplateText = {
+    type: 'text';
+    value: string;
+    start: number;
+    end: number;
+};
+
+export type TemplateExpression = {
+    type: 'expression';
+    value: string;
+    start: number; // Start index of the expression content (after `{{`)
+    end: number; // End index of the expression content (before `}}`)
+};
+
+export type TemplatePart = TemplateText | TemplateExpression;
+
+/**
+ * Parse a template string containing `{{ expression }}` placeholders.
+ */
+export function parseTemplate(template: string): TemplatePart[] {
+    const parts: TemplatePart[] = [];
+    const regex = /\{\{(.*?)\}\}/gs;
+    let lastIndex = 0;
+
+    for (const match of template.matchAll(regex)) {
+        const matchStart = match.index ?? 0;
+        const matchEnd = matchStart + match[0].length;
+
+        if (matchStart > lastIndex) {
+            parts.push({
+                type: 'text',
+                value: template.slice(lastIndex, matchStart),
+                start: lastIndex,
+                end: matchStart,
+            });
+        }
+
+        parts.push({
+            type: 'expression',
+            value: (match[1] ?? '').trim(),
+            start: matchStart + 2,
+            end: matchEnd - 2,
+        });
+        lastIndex = matchEnd;
+    }
+
+    if (lastIndex < template.length) {
+        parts.push({
+            type: 'text',
+            value: template.slice(lastIndex),
+            start: lastIndex,
+            end: template.length,
+        });
+    }
+
+    return parts;
+}

packages/expr/src/types.ts

@@ -0,0 +1,176 @@
+import type { BinaryOperator, Expression, ExpressionStatement, LogicalOperator } from 'acorn';
+
+import type { ArraySymbolDef, SymbolInfo, SymbolType } from './symbols';
+
+export interface ExpressionGenerator {
+    /**
+     * Converts an ESTree compatible AST node into a string representing the corresponding expression.
+     */
+    generate(node: Expression): string;
+}
+
+export interface ExpressionParserResult {
+    /**
+     * The expression statement from the valid portion of the parsed expression.
+     *
+     * It is undefined when no valid expression statements could be found.
+     */
+    result: Expression;
+
+    /**
+     * The information of the invalid (non-expression) nodes found from the other portions of the parsed expression.
+     */
+    invalidNodes: Array<ExpressionStatement>;
+}
+
+export interface ExpressionAutocompleteResults {
+    suggestions: AutocompleteSuggestions;
+}
+
+type ConditionalOperator = '?';
+
+export const SUPPORTED_BINARY_OPERATORS = [
+    {
+        operator: '==',
+        description: 'Checks whether two values are equal.',
+        link: 'https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Operators/Equality',
+    },
+    {
+        operator: '!=',
+        description: 'Checks whether two values are unequal.',
+        link: 'https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Operators/Inequality',
+    },
+    {
+        operator: '===',
+        description: 'Checks whether two values are equal (strict comparison).',
+        link: 'https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Operators/Strict_equality',
+    },
+    {
+        operator: '!==',
+        description: 'Checks whether two values are unequal (strict comparison).',
+        link: 'https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Operators/Strict_inequality',
+    },
+    {
+        operator: '<',
+        description: 'Checks if the left value is less than the right value.',
+        link: 'https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Operators/Less_than',
+    },
+    {
+        operator: '<=',
+        description: 'Checks if the left value is less than or equal to the right value.',
+        link: 'https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Operators/Less_than_or_equal',
+    },
+    {
+        operator: '>',
+        description: 'Checks if the left value is greater than the right value.',
+        link: 'https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Operators/Greater_than',
+    },
+    {
+        operator: '>=',
+        description: 'Checks if the left value is greater than or equal to the right value.',
+        link: 'https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Operators/Greater_than_or_equal',
+    },
+    {
+        operator: 'in',
+        description: 'Checks if a property exists in an object or if a value is in an array.',
+        link: 'https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Operators/in',
+    },
+] as const;
+
+export const SUPPORTED_LOGICAL_OPERATORS = [
+    {
+        operator: '&&',
+        description: 'Logical AND operator; returns true if both operands are true.',
+        link: 'https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Operators/Logical_AND',
+    },
+    {
+        operator: '||',
+        description: 'Logical OR operator; returns true if at least one operand is true.',
+        link: 'https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Operators/Logical_OR',
+    },
+] as const;
+
+export const SUPPORTED_CONDITIONAL_OPERATORS = [
+    {
+        operator: '?',
+        description:
+            'Conditional (ternary) operator; returns one of two values based on a condition.',
+        link: 'https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Operators/Conditional_Operator',
+    },
+] as const;
+
+type DirectLiteralValue = {
+    kind: 'direct';
+} & (
+    | {
+          type: SymbolType.Boolean;
+          data: boolean;
+      }
+    | {
+          type: SymbolType.Number;
+          data: number;
+      }
+    | {
+          type: SymbolType.String;
+          data: string;
+      }
+    | {
+          type: SymbolType.Null;
+          data: null;
+      }
+);
+
+type InArrayLiteralValue = {
+    kind: 'in-array';
+    srcSymbol: ArraySymbolDef;
+    matchedLiteralString: string;
+};
+
+export type DirectLiteralValueSuggestion = {
+    type: 'literal-value';
+    value: DirectLiteralValue;
+};
+
+export type InArrayLiteralValueSuggestion = {
+    type: 'literal-value';
+    value: InArrayLiteralValue;
+};
+
+export type AutocompleteLiteralValueSuggestion =
+    | DirectLiteralValueSuggestion
+    | InArrayLiteralValueSuggestion;
+
+export interface AutocompleteOperatorSuggestion {
+    type: 'operator';
+    operator:
+        | Extract<BinaryOperator, (typeof SUPPORTED_BINARY_OPERATORS)[number]['operator']>
+        | Extract<LogicalOperator, (typeof SUPPORTED_LOGICAL_OPERATORS)[number]['operator']>
+        | Extract<
+              ConditionalOperator,
+              (typeof SUPPORTED_CONDITIONAL_OPERATORS)[number]['operator']
+          >;
+    description: string;
+    link: string;
+}
+
+export interface AutocompleteSymbolSuggestion {
+    type: 'symbol';
+    symbol: SymbolInfo;
+}
+
+export type AutocompleteSuggestions = Array<
+    | AutocompleteSymbolSuggestion
+    | AutocompleteLiteralValueSuggestion
+    | AutocompleteOperatorSuggestion
+>;
+
+type LoggerFn = (message: string, ...args: any[]) => void;
+
+/**
+ * A logger that can be passed to the runtime.
+ */
+export interface Logger {
+    debug: LoggerFn;
+    info: LoggerFn;
+    error: LoggerFn;
+}

packages/expr/src/utils.ts

@@ -0,0 +1,40 @@
+/**
+ * Format the result value of an expression for display as a string.
+ */
+export function formatExpressionResult(value: any, defaultValue = ''): string {
+    if (value === undefined || value === null) {
+        return defaultValue;
+    }
+
+    if (typeof value === 'string') {
+        return value;
+    }
+
+    if (typeof value === 'number' || typeof value === 'boolean') {
+        return value.toString();
+    }
+
+    return defaultValue;
+}
+
+/**
+ * Filter function to exclude `null` values
+ */
+export function filterOutNullable<T>(value: T): value is NonNullable<T> {
+    return !!value;
+}
+
+/**
+ * Type to make optional properties on a object mandatory.
+ *
+ * interface SomeObject {
+ *   uid: string;
+ *   price: number | null;
+ *   location?: string;
+ * }
+ *
+ * type ValuableObject = MandateProps<SomeObject, 'price' | 'location'>;
+ */
+export type MandateProps<T extends {}, K extends keyof T> = T & {
+    [MK in K]-?: NonNullable<T[MK]>;
+};

packages/expr/tsconfig.json

@@ -0,0 +1,18 @@
+{
+    "$schema": "https://json.schemastore.org/tsconfig",
+    "extends": ["@tsconfig/strictest/tsconfig.json", "@tsconfig/node20/tsconfig.json"],
+    "compilerOptions": {
+        "lib": ["ESNext", "DOM"],
+        "module": "ESNext",
+        "moduleResolution": "bundler",
+        "isolatedModules": true,
+        "incremental": true,
+        "noEmit": true,
+        "noPropertyAccessFromIndexSignature": false,
+        "exactOptionalPropertyTypes": false,
+        "types": [
+            "bun-types" // add Bun global
+        ]
+    },
+    "include": ["types/**/*.d.ts", "src/**/*.ts"]
+}

packages/expr/tsdown.config.ts

@@ -0,0 +1,9 @@
+import { defineConfig } from 'tsdown';
+
+export default defineConfig([
+    {
+        entry: ['src/index.ts'],
+        dts: true,
+        format: ['esm'],
+    },
+]);

packages/expr/types/eval-estree-expression.d.ts

@@ -0,0 +1,57 @@
+declare module 'eval-estree-expression' {
+    /**
+     * Options for evaluation and compilation.
+     */
+    export interface EvalESTreeExpressionOptions {
+        /**
+         * Force logical operators to return a boolean result. Default: undefined
+         */
+        booleanLogicalOperators?: boolean;
+        /**
+         * Allow function calls to be evaluated. This is unsafe, please enable this option at your own risk. Default: false
+         */
+        functions?: boolean;
+        /**
+         * Enable support for function statements and expressions by enabling the functions option AND by passing the .generate() function from the escodegen library. Default: undefined
+         */
+        generate?: boolean | ((node: any) => string);
+        /**
+         * Enable the =~ regex operator to support testing values without using functions (example name =~ /^a.*c$/). Default: true
+         */
+        regexOperator?: boolean;
+        /**
+         * Throw an error when variables are undefined. Default: false
+         */
+        strict?: boolean;
+        /**
+         * Used with the variables method to return nested variables (e.g., variables with dot notation, like foo.bar.baz). Default: undefined
+         */
+        withMembers?: boolean;
+    }
+
+    /**
+     * Evaluates an ESTree expression asynchronously against a given context.
+     * @param expression - An object representing an ESTree-compliant AST node.
+     * @param context - An object containing variables and values to be used during evaluation.
+     * @returns A promise resolving to the result of the evaluation.
+     */
+    export function evaluate<ASTNode>(
+        ast: ASTNode,
+        context: object,
+        options?: EvalESTreeExpressionOptions
+    ): Promise<any>;
+
+    /**
+     * Evaluates an ESTree expression synchronously against a given context.
+     * @param expression - An object representing an ESTree-compliant AST node.
+     * @param context - An object containing variables and values to be used during evaluation.
+     * @returns The result of the evaluation.
+     */
+    export namespace evaluate {
+        function sync<ASTNode>(
+            expression: ASTNode,
+            context: object,
+            options?: EvalESTreeExpressionOptions
+        ): any;
+    }
+}

packages/fonts/src/getDefaultFont.ts

@@ -67,7 +67,7 @@ function getBestUnicodeRange(text: string, ranges: Record<string, string>): stri
 
         const body = token.slice(2); // drop "U+"
         const [startHex, endHex] = body.split('-');
-        const start = Number.parseInt(startHex, 16);
+        const start = Number.parseInt(startHex!, 16);
         const end = endHex ? Number.parseInt(endHex, 16) : start;
 
         if (Number.isNaN(start) || Number.isNaN(end) || end < start) return null;
@@ -92,7 +92,7 @@ function getBestUnicodeRange(text: string, ranges: Record<string, string>): stri
 
         for (const [label, rangesArr] of Object.entries(parsed)) {
             if (rangesArr.some(([lo, hi]) => cp >= lo && cp <= hi)) {
-                hits[label]++;
+                hits[label]!++;
             }
         }
     }

packages/fonts/tsconfig.json

@@ -4,6 +4,7 @@
         "module": "ESNext",
         "target": "es2022",
         "strict": true,
+        "noUncheckedIndexedAccess": true,
         "esModuleInterop": true,
         "skipLibCheck": true,
         "moduleResolution": "bundler",

packages/gitbook/CHANGELOG.md

@@ -1,5 +1,230 @@
 # gitbook
 
+## 0.19.0
+
+### Minor Changes
+
+- ed7d47d: Show a toolbar for authenticated users with access to the current site.
+- 50c1be3: Move inline expression evaluation from API to GBO
+- 56e46ce: Add Italian translation
+- b932e4e: Scope search across sections and variants
+
+### Patch Changes
+
+- 162cfe4: Hide sections if only one is present
+- 1456251: Unify section display condition
+- 9344431: Fix missing geo data in site insights because of incorrect proxying of events.
+- eea8f1e: Enhance OpenAPI security scopes handling
+- 2b8a2d2: Add stable scroll gutter to search container
+- b498521: Fix robots.txt preventing favicon from being indexed.
+- ceb32b1: Redo search scope UI
+- 8e99871: Highlight discriminator properties in oneOf, allOf, anyOf objects
+- 2fc2127: Make search accessible
+- f3e4041: Adapt OpenAPI code samples to prefill API key using visitor data
+- 6815dd1: Fix markdownPageURL for PageActions
+- c06b3dd: Improve default site icon
+- cba583a: Use sitespace title instead of space title in search
+- e434442: Support nested site section groups
+- 469b332: Add support for inline expressions rendering with visitor data on GBO side
+- 0ef5dc8: Update to column width sizing
+- 1e4e54e: Fix rounded outline items
+- 379d486: Expose "Best match" when site has translations
+- c21693f: Improve screen reader accessibility for hints
+- badf3a9: Add alt text to inline image
+- c23d4ef: Fix crash for card cover defined without objectFit
+- d74f8a7: Improve wide page width layout
+- b8388e5: Add scrollcontainer component
+- b85eccd: Refactor section tabs
+- 1e53f46: Fix button content truncate
+- 7a504b7: Fix OpenAPI response dropdown & vertical overflow
+- a4c3399: Fix OpenAPI alternatives not showing
+- Updated dependencies [a629900]
+- Updated dependencies [eea8f1e]
+- Updated dependencies [8e99871]
+- Updated dependencies [f3e4041]
+- Updated dependencies [319a1e5]
+- Updated dependencies [529f940]
+- Updated dependencies [754cc11]
+- Updated dependencies [d7948e3]
+- Updated dependencies [a4c3399]
+  - @gitbook/expr@1.2.1
+  - @gitbook/react-openapi@1.5.0
+
+## 0.18.0
+
+### Minor Changes
+
+- 262afa3: Expose a MCP server for the docs site under /~gitbook/mcp
+
+### Patch Changes
+
+- Updated dependencies [262afa3]
+  - @gitbook/icons@0.3.1
+  - @gitbook/react-openapi@1.4.3
+  - @gitbook/react-contentkit@0.7.5
+
+## 0.17.2
+
+### Patch Changes
+
+- @gitbook/react-openapi@1.4.2
+
+## 0.17.1
+
+### Patch Changes
+
+- 24f601d: Small optim in resolveTryItPrefillForOperation
+- aea5eb1: Persist language choice across sections if possible
+- 1165a81: Language selector edge cases
+- f9a2977: Better handling for external link "mailto:" in Hovered Card in GBO
+- Updated dependencies [24f601d]
+  - @gitbook/react-openapi@1.4.1
+
+## 0.17.0
+
+### Minor Changes
+
+- 12c9d76: Adapt OpenAPI blocks to eval adaptive exprs & prefill TryIt config
+- 7911350: Add language selector to site header
+- 659be55: Track insight event when embedded assistant is displayed.
+
+### Patch Changes
+
+- 2e0d706: Fix corner radius of active section on "Line" sidebar style
+- 78a632b: Fix edit on GitHub button doesn't take you to GitHub
+- 1edc5d6: Add "hold message" to Assistant
+- 4520728: Support bold in headings
+- 61b8507: OpenAPI: Make responses without objects clickable
+- d1fdc13: Remove ligatures from Lato font
+- a8fca0e: Fix custom assistant keyboard shortcut
+- 262a9b1: Fix embed script and assets being cached for too long
+- c890e01: Fix order in robots.txt preventing indexation of images by Google.
+- 1839ea2: Fix content min-height with sections
+- 9201e2c: Adds vertical align to column block
+- 193d591: Use space language as source of truth for UI locale
+- f08dd29: Fix Search results are not clickable on sites without header
+- 17dd382: Add `original` background color step
+- 4f35882: Fix event ask_question not being tracked
+- d51b79e: Fix Search bar is broken on site with sections when header is disabled
+- 6f368b5: Fix embed assistant window width on small screens
+- Updated dependencies [193d591]
+- Updated dependencies [12c9d76]
+- Updated dependencies [4927e96]
+- Updated dependencies [61b8507]
+- Updated dependencies [7fefe49]
+- Updated dependencies [360aa1c]
+- Updated dependencies [98e42cf]
+- Updated dependencies [17dd382]
+  - @gitbook/colors@0.4.0
+  - @gitbook/react-openapi@1.4.0
+  - @gitbook/openapi-parser@3.0.2
+
+## 0.16.0
+
+### Minor Changes
+
+- 6830815: Support custom AI providers
+- cbc71a5: Allow integrations to provide tools to the Docs Assistant
+- cc2e615: Emit a <link rel="alternate"> for the markdown version of a page
+- 81a6bd7: Support customization of buttons and tools through iframe API
+- 8927e8f: Start routes for embeddable version of the assistant and docs pages.
+
+### Patch Changes
+
+- d30bcba: Improve `Button` and `ButtonGroup` styling
+- e1b2cf6: Fix scroll of page outline
+- d655d3e: Support "objectivec" as alias for Objective C syntax
+- 13ff22b: Fix AI Search follow-up question closing search
+- ffa866c: Small fixes to search modal
+- 36af03f: Fixes to `PageAside`
+- fb858a1: Tweaks to AIChatButton and AIChatInput
+- bcfa8d8: Improve vertical alignment of site items and fix floating page aside
+- ea7e94f: Fix search bar layout shift caused by ToC
+- 2e6e28e: Fix: Long strings overflow out of message bubble in docs assistant
+- ff96bb5: Support new coverDefinitionDark for cards & image type
+- 388b20d: Clear AI chat properly
+- ba7ec14: Fix bug in search highlight in GBO
+- 6217a2e: Page outline: scroll to active item
+- 42c17f5: Improve OpenAPI parsing errors
+- 854c448: Custom assistants followup
+- 43766d6: Fix Custom logo not rendering on the published site
+- Updated dependencies [cbc71a5]
+- Updated dependencies [25e2b40]
+- Updated dependencies [42c17f5]
+- Updated dependencies [854c448]
+  - @gitbook/browser-types@0.1.0
+  - @gitbook/icons@0.3.0
+  - @gitbook/openapi-parser@3.0.1
+  - @gitbook/react-contentkit@0.7.4
+  - @gitbook/react-openapi@1.3.6
+
+## 0.15.0
+
+### Minor Changes
+
+- d130532: Suggest questions in the current space context
+
+### Patch Changes
+
+- 44f4151: Fix close buttons tooltips
+- d903273: Strip visitor params from URL
+- df7de8f: Fix an issue where links were not rendering properly in Ask AI answers
+- d270b4a: All tracking is now disabled for dynamic routes such as the site preview.
+- b1f608b: Implement basic URL scheme for assistant with ask
+- d024658: Prevent page breaks inside blocks when printing
+- 185cdb4: Fix scrolling to anchor positionning
+- 5c49235: Remove highlighting in Safari for PowerShell and C++ to avoid page crash until next version with bug fix is released
+- f1a6dec: Update OpenAPI parser
+- 2cdba53: Upgrade to Tailwind v4
+- Updated dependencies [2cdba53]
+- Updated dependencies [f1a6dec]
+  - @gitbook/react-math@0.6.1
+  - @gitbook/icons@0.2.2
+  - @gitbook/openapi-parser@3.0.0
+  - @gitbook/react-contentkit@0.7.3
+  - @gitbook/react-openapi@1.3.5
+
+## 0.14.1
+
+### Patch Changes
+
+- 7c951ef: 'Support new colors in text formatting
+- 39c4f76: Add fullwidth page option
+- eb1bd3a: AI response feedback buttons
+- 2ba7e54: Fix headings styles in hint block
+- 250c194: Add nosnippet to announcement banner.
+- 4aeb81b: Fix search input styling & text cutoff
+- 68f0dbc: Add confirmation modal to contentkit button
+- 611e286: Remove padding on first Heading in Columns
+- b0c534f: Tweaks to AI Chat and AI Actions Dropdown
+- Updated dependencies [b5ad0ce]
+  - @gitbook/openapi-parser@2.2.2
+  - @gitbook/react-openapi@1.3.4
+
+## 0.14.0
+
+### Minor Changes
+
+- 0003030: Implement AI actions dropdown
+- acb9f53: New search layout
+
+### Patch Changes
+
+- 334cfdd: Fix responsive class for SearchInput button
+- 6816f0f: add browserlists and fix old browser css-masks
+- 9ee9082: Refactor icon loading state in AIAction components
+- 52ab368: Reposition AI Actions dropdown
+- 7212345: Fix AI Actions dropdown and LLM integration
+- 8daede5: Ensure all content links are resolved relatively to preview.
+- ed684c1: Move AI Actions markdown fetching to client-side
+- 9cc5a78: Generalise keyboard shortcuts, add Cmd+J to AI Chat
+- Updated dependencies [6816f0f]
+- Updated dependencies [1738677]
+  - @gitbook/icons@0.2.1
+  - @gitbook/openapi-parser@2.2.1
+  - @gitbook/react-contentkit@0.7.2
+  - @gitbook/react-openapi@1.3.3
+
 ## 0.13.1
 
 ### Patch Changes

packages/gitbook/e2e/customers.spec.ts

@@ -62,11 +62,11 @@ const testCases: TestsCase[] = [
         contentBaseURL: 'https://docs.gmgn.ai',
         tests: [{ name: 'Home', url: '/' }],
     },
-    {
-        name: 'docs.spicychat.ai',
-        contentBaseURL: 'https://docs.spicychat.ai',
-        tests: [{ name: 'Home', url: '/' }],
-    },
+    // {
+    //     name: 'docs.spicychat.ai',
+    //     contentBaseURL: 'https://docs.spicychat.ai',
+    //     tests: [{ name: 'Home', url: '/' }],
+    // },
     {
         name: 'docs.portainer.io',
         contentBaseURL: 'https://docs.portainer.io',

packages/gitbook/e2e/internal.spec.ts

@@ -1,4 +1,5 @@
 import {
+    CustomizationAIMode,
     CustomizationBackground,
     CustomizationCorners,
     CustomizationDefaultMonospaceFont,
@@ -19,6 +20,7 @@ import {
 
 import { getSiteAPIToken } from '../tests/utils';
 import {
+    type Test,
     type TestsCase,
     allDeprecatedThemePresets,
     allLocales,
@@ -34,6 +36,179 @@ import {
     waitForNotFound,
 } from './util';
 
+const searchTestCases: Test[] = [
+    {
+        name: 'Search - AI Mode: None - Complete flow',
+        url: getCustomizationURL({
+            ai: {
+                mode: CustomizationAIMode.None,
+            },
+        }),
+        screenshot: false,
+        run: async (page) => {
+            const searchInput = page.getByTestId('search-input');
+            await searchInput.focus();
+            await expect(page.getByTestId('search-results')).toHaveCount(0); // No pop-up yet because there's no recommended questions.
+
+            // Fill search input, expecting search results
+            await searchInput.fill('gitbook');
+            await expect(page.getByTestId('search-results')).toBeVisible();
+            const pageResults = await page.getByTestId('search-page-result').all();
+            await expect(pageResults.length).toBeGreaterThanOrEqual(1);
+            const pageSectionResults = await page.getByTestId('search-page-section-result').all();
+            await expect(pageSectionResults.length).toBeGreaterThanOrEqual(2);
+            await expect(page.getByTestId('search-ask-question')).toHaveCount(0); // No AI search results with aiMode=None.
+        },
+    },
+    {
+        name: 'Search - AI Mode: None - Keyboard shortcut',
+        url: getCustomizationURL({
+            ai: {
+                mode: CustomizationAIMode.None,
+            },
+        }),
+        screenshot: false,
+        run: async (page) => {
+            await page.keyboard.press('ControlOrMeta+K');
+            await expect(page.getByTestId('search-input')).toBeFocused();
+        },
+    },
+    {
+        name: 'Search - AI Mode: None - URL query (Initial)',
+        url: `${getCustomizationURL({
+            ai: {
+                mode: CustomizationAIMode.None,
+            },
+        })}&q=`,
+        run: async (page) => {
+            await expect(page.getByTestId('search-results')).toHaveCount(0); // No pop-up yet because there's no recommended questions.
+        },
+    },
+    {
+        name: 'Search - AI Mode: None - URL query (Results)',
+        url: `${getCustomizationURL({
+            ai: {
+                mode: CustomizationAIMode.None,
+            },
+        })}&q=gitbook`,
+        run: async (page) => {
+            await expect(page.getByTestId('search-input')).toBeFocused();
+            await expect(page.getByTestId('search-input')).toHaveValue('gitbook');
+            await expect(page.getByTestId('search-results')).toBeVisible();
+        },
+    },
+    // TODO: Re-enable the following tests when we have fixed the AI Search timing out:
+    // - Search - AI Mode: Search - Complete flow
+    // - Search - AI Mode: Search - URL query (Initial)
+    {
+        name: 'Search - AI Mode: Search - URL query (Results)',
+        url: `${getCustomizationURL({
+            ai: {
+                mode: CustomizationAIMode.Search,
+            },
+        })}&q=gitbook`,
+        screenshot: false,
+        run: async (page) => {
+            await expect(page.getByTestId('search-input')).toBeFocused();
+            await expect(page.getByTestId('search-input')).toHaveValue('gitbook');
+            await expect(page.getByTestId('search-results')).toBeVisible();
+        },
+    },
+    // TODO: Re-enable the following tests when we have fixed the AI Search timing out:
+    // - Ask - AI Mode: Search - URL query (Ask initial)
+    // - Ask - AI Mode: Search - URL query (Ask results)
+    {
+        name: 'Ask - AI Mode: Assistant - Complete flow',
+        url: getCustomizationURL({
+            ai: {
+                mode: CustomizationAIMode.Assistant,
+            },
+        }),
+        screenshot: false,
+        run: async (page) => {
+            const searchInput = page.locator('css=[data-testid="search-input"]');
+
+            // Focus search input, expecting recommended questions
+            await searchInput.focus();
+            // TODO: Re-enable this part of the test when we have fixed the AI Search timing out
+            // await expect(page.getByTestId('search-results')).toBeVisible();
+            // const recommendedQuestions = await page
+            //     .getByTestId('search-recommended-question')
+            //     .all();
+            // await expect(recommendedQuestions.length).toBeGreaterThan(2); // Expect at least 3 questions
+
+            // Fill search input, expecting AI search option
+            await searchInput.fill('What is gitbook?');
+            const aiSearchResult = page.getByTestId('search-ask-question');
+            await expect(aiSearchResult).toBeVisible();
+            await aiSearchResult.click();
+            await expect(page.getByTestId('ai-chat')).toBeVisible();
+        },
+    },
+    {
+        name: 'Ask - AI Mode: Assistant - Keyboard shortcut',
+        url: getCustomizationURL({
+            ai: {
+                mode: CustomizationAIMode.Assistant,
+            },
+        }),
+        screenshot: false,
+        run: async (page) => {
+            await page.keyboard.press('ControlOrMeta+I');
+            await expect(page.getByTestId('ai-chat')).toBeVisible();
+            await expect(page.getByTestId('ai-chat-input')).toBeFocused();
+        },
+    },
+    {
+        name: 'Ask - AI Mode: Assistant - Button',
+        url: getCustomizationURL({
+            ai: {
+                mode: CustomizationAIMode.Assistant,
+            },
+        }),
+        screenshot: false,
+        run: async (page) => {
+            await page.getByTestId('ai-chat-button').click();
+            await expect(page.getByTestId('ai-chat')).toBeVisible();
+            await expect(page.getByTestId('ai-chat-input')).toBeFocused();
+        },
+    },
+    {
+        name: 'Ask - AI Mode: Assistant - URL query (Initial)',
+        url: `${getCustomizationURL({
+            ai: {
+                mode: CustomizationAIMode.Assistant,
+            },
+        })}&ask=`,
+        screenshot: false,
+        run: async (page) => {
+            await expect(page.getByTestId('search-input')).not.toBeFocused();
+            await expect(page.getByTestId('search-input')).not.toHaveValue('What is GitBook?');
+            await expect(page.getByTestId('ai-chat')).toBeVisible();
+            await expect(page.getByTestId('ai-chat-input')).toBeFocused();
+        },
+    },
+    {
+        name: 'Ask - AI Mode: Assistant - URL query (Results)',
+        url: `${getCustomizationURL({
+            ai: {
+                mode: CustomizationAIMode.Assistant,
+            },
+        })}&ask=What+is+GitBook%3F`,
+        screenshot: false,
+        run: async (page) => {
+            await expect(page.getByTestId('search-input')).not.toBeFocused();
+            await expect(page.getByTestId('search-input')).not.toHaveValue('What is GitBook?');
+            await expect(page.getByTestId('ai-chat')).toBeVisible({
+                timeout: 15_000,
+            });
+            await expect(page.getByTestId('ai-chat-message').first()).toHaveText(
+                'What is GitBook?'
+            );
+        },
+    },
+];
+
 const testCases: TestsCase[] = [
     {
         name: 'GitBook Site (Single Variant)',
@@ -53,34 +228,7 @@ const testCases: TestsCase[] = [
                     );
                 },
             },
-            {
-                name: 'Search',
-                url: '?q=',
-                screenshot: false,
-                run: async (page) => {
-                    await expect(page.getByTestId('search-results')).toBeVisible();
-                    const allItems = await page.getByTestId('search-result-item').all();
-                    // Expect at least 3 questions
-                    await expect(allItems.length).toBeGreaterThan(2);
-                },
-            },
-            {
-                name: 'Search Results',
-                url: '?q=gitbook',
-                run: async (page) => {
-                    await expect(page.getByTestId('search-results')).toBeVisible();
-                },
-            },
-            {
-                name: 'AI Search',
-                url: '?q=What+is+GitBook%3F&ask=true',
-                run: async (page) => {
-                    await expect(page.getByTestId('search-ask-answer')).toBeVisible({
-                        timeout: 15_000,
-                    });
-                },
-                screenshot: false,
-            },
+            ...searchTestCases,
             {
                 name: 'Not found',
                 url: 'content-not-found',
@@ -279,34 +427,7 @@ const testCases: TestsCase[] = [
                 url: '',
                 run: waitForCookiesDialog,
             },
-            {
-                name: 'Search',
-                url: '?q=',
-                screenshot: false,
-                run: async (page) => {
-                    await expect(page.getByTestId('search-results')).toBeVisible();
-                    const allItems = await page.getByTestId('search-result-item').all();
-                    // Expect at least 3 questions
-                    await expect(allItems.length).toBeGreaterThan(2);
-                },
-            },
-            {
-                name: 'Search Results',
-                url: '?q=gitbook',
-                run: async (page) => {
-                    await expect(page.getByTestId('search-results')).toBeVisible();
-                },
-            },
-            {
-                name: 'AI Search',
-                url: '?q=What+is+GitBook%3F&ask=true',
-                run: async (page) => {
-                    await expect(page.getByTestId('search-ask-answer')).toBeVisible({
-                        timeout: 15_000,
-                    });
-                },
-                screenshot: false,
-            },
+            ...searchTestCases,
             {
                 name: 'Not found',
                 url: 'content-not-found',
@@ -415,6 +536,28 @@ const testCases: TestsCase[] = [
                     await expect(page.locator('[data-testid="table-of-contents"]')).toBeVisible();
                 },
             },
+            {
+                name: 'With sections',
+                url: async () => {
+                    const data = await getSiteAPIToken('https://gitbook.com/docs');
+
+                    const searchParams = new URLSearchParams();
+                    searchParams.set('token', data.apiToken);
+
+                    return `url/preview/${data.site}/?${searchParams.toString()}`;
+                },
+                screenshot: false,
+                run: async (page) => {
+                    const sectionTabs = page.getByLabel('Sections');
+                    await expect(sectionTabs).toBeVisible();
+
+                    const sectionTabLinks = sectionTabs.getByRole('link');
+                    for (const link of await sectionTabLinks.all()) {
+                        const href = await link.getAttribute('href');
+                        expect(href).toMatch(/^\/url\/preview\/site_p4Xo4\/?/);
+                    }
+                },
+            },
         ],
     },
     {
@@ -910,6 +1053,22 @@ const testCases: TestsCase[] = [
             },
         ]),
     },
+    {
+        name: 'Page actions',
+        contentBaseURL: 'https://gitbook.gitbook.io/test-gitbook-open/',
+        tests: [
+            {
+                name: 'Without page actions',
+                url: getCustomizationURL({
+                    pageActions: {
+                        markdown: false,
+                        externalAI: false,
+                    },
+                }),
+                run: waitForCookiesDialog,
+            },
+        ],
+    },
     {
         name: 'Ads',
         contentBaseURL: 'https://gitbook.gitbook.io/test-gitbook-open/',

packages/gitbook/e2e/util.ts

@@ -318,10 +318,6 @@ export function getCustomizationURL(partial: DeepPartial<SiteCustomizationSettin
         feedback: {
             enabled: false,
         },
-        // TODO: remove aiSearch once the cache has been fully updated (after 11/07/2025)
-        aiSearch: {
-            enabled: true,
-        },
         ai: {
             mode: CustomizationAIMode.None,
         },
@@ -337,6 +333,11 @@ export function getCustomizationURL(partial: DeepPartial<SiteCustomizationSettin
         pagination: {
             enabled: true,
         },
+        pageActions: {
+            externalAI: true,
+            markdown: true,
+            mcp: true,
+        },
         trademark: {
             enabled: true,
         },

packages/gitbook/next.config.mjs

@@ -14,6 +14,9 @@ const nextConfig = {
             dynamic: 3600, // 1 hour
             static: 3600, // 1 hour
         },
+
+        // Since content is fully static, we don't want to fetch on hover again
+        optimisticClientCache: false,
     },
 
     env: {

packages/gitbook/openNext/customWorkers/default.js

@@ -2,6 +2,9 @@ import { runWithCloudflareRequestContext } from '../../.open-next/cloudflare/ini
 
 import { DurableObject } from 'cloudflare:workers';
 
+//Only needed to run locally, in prod we'll use the one from do.js
+export { DOShardedTagCache } from '../../.open-next/.build/durable-objects/sharded-tag-cache.js';
+
 // Only needed to run locally, in prod we'll use the one from do.js
 export class R2WriteBuffer extends DurableObject {
     writePromise;

packages/gitbook/openNext/customWorkers/defaultWrangler.jsonc

@@ -16,7 +16,9 @@
     "env": {
         "dev": {
             "vars": {
-                "STAGE": "dev"
+                "STAGE": "dev",
+                "OPEN_NEXT_REQUEST_ID_HEADER": "true",
+                "GITBOOK_URL": "http://localhost:8771"
             },
             "r2_buckets": [
                 {
@@ -35,13 +37,17 @@
                     {
                         "name": "WRITE_BUFFER",
                         "class_name": "R2WriteBuffer"
+                    },
+                    {
+                        "name": "NEXT_TAG_CACHE_DO_SHARDED",
+                        "class_name": "DOShardedTagCache"
                     }
                 ]
             },
             "migrations": [
                 {
                     "tag": "v1",
-                    "new_sqlite_classes": ["R2WriteBuffer"]
+                    "new_sqlite_classes": ["R2WriteBuffer", "DOShardedTagCache"]
                 }
             ]
         },
@@ -84,6 +90,9 @@
             }
         },
         "staging": {
+            "vars": {
+                "OPEN_NEXT_REQUEST_ID_HEADER": "true"
+            },
             "r2_buckets": [
                 {
                     "binding": "NEXT_INC_CACHE_R2_BUCKET",
@@ -125,7 +134,8 @@
             "vars": {
                 // This is a bit misleading, but it means that we can have 500 concurrent revalidations
                 // This means that we'll have up to 100 durable objects instance running at the same time
-                "MAX_REVALIDATE_CONCURRENCY": "100"
+                "MAX_REVALIDATE_CONCURRENCY": "100",
+                "OPEN_NEXT_REQUEST_ID_HEADER": "true"
             },
             "r2_buckets": [
                 {

packages/gitbook/openNext/customWorkers/middleware.js

@@ -7,12 +7,39 @@ export { DOQueueHandler } from '../../.open-next/.build/durable-objects/queue.js
 
 export { DOShardedTagCache } from '../../.open-next/.build/durable-objects/sharded-tag-cache.js';
 
+//Format used by the tail logger
+const formatLog = (requestDuration, responseCode, responseCache, responseRoute) =>
+    `%${JSON.stringify({ requestDuration, responseCode, responseCache, responseRoute })}%[main] Response Done`;
+
+const getResolvedRoute = (reqOrResp, defaultValue) => {
+    try {
+        const resolvedRoutes = JSON.parse(
+            reqOrResp.headers.get('x-opennext-resolved-routes') ?? ''
+        )[0].route;
+        return resolvedRoutes ?? defaultValue;
+    } catch {
+        return defaultValue;
+    }
+};
+
 export default class extends WorkerEntrypoint {
     async fetch(request) {
         return runWithCloudflareRequestContext(request, this.env, this.ctx, async () => {
+            const startTime = Date.now();
+            const middlewareRequest = new Request(request.url, request);
+            middlewareRequest.headers.set('x-open-next-continent', request.cf?.continent || '');
             // - `Request`s are handled by the Next server
-            const reqOrResp = await middlewareHandler(request, this.env, this.ctx);
+            const reqOrResp = await middlewareHandler(middlewareRequest, this.env, this.ctx);
             if (reqOrResp instanceof Response) {
+                const duration = Date.now() - startTime;
+                const logMessage = formatLog(
+                    duration,
+                    reqOrResp.status,
+                    reqOrResp.headers.get('x-opennext-cache') ?? 'MISS',
+                    getResolvedRoute(reqOrResp, 'middleware')
+                );
+                // biome-ignore lint/suspicious/noConsole: <explanation>
+                console.log(logMessage);
                 return reqOrResp;
             }
 
@@ -22,17 +49,31 @@ export default class extends WorkerEntrypoint {
                     'Cloudflare-Workers-Version-Overrides',
                     `gitbook-open-v2-${this.env.STAGE}="${this.env.WORKER_VERSION_ID}"`
                 );
-                return this.env.DEFAULT_WORKER?.fetch(reqOrResp, {
+                const response = await this.env.DEFAULT_WORKER?.fetch(reqOrResp, {
+                    redirect: 'manual',
                     cf: {
                         cacheEverything: false,
                     },
                 });
+                const formatedLog = formatLog(
+                    Date.now() - startTime,
+                    response.status,
+                    `SERVER-${response.headers.get('x-nextjs-cache') ?? 'MISS'}`,
+                    getResolvedRoute(reqOrResp, 'unresolved')
+                );
+                // biome-ignore lint/suspicious/noConsole: <explanation>
+                console.log(formatedLog);
+
+                return response;
             }
             // If we are in preview mode, we need to send the request to the preview URL
             const modifiedUrl = new URL(reqOrResp.url);
             modifiedUrl.hostname = this.env.PREVIEW_HOSTNAME;
             const nextRequest = new Request(modifiedUrl, reqOrResp);
             return fetch(nextRequest, {
+                // We never want to follow the redirects here.
+                // Redirects are supposed to happen from the client.
+                redirect: 'manual',
                 cf: {
                     cacheEverything: false,
                 },

packages/gitbook/openNext/customWorkers/middlewareWrangler.jsonc

@@ -21,7 +21,12 @@
         "dev": {
             "vars": {
                 "STAGE": "dev",
-                "NEXT_PRIVATE_DEBUG_CACHE": "true"
+                "NEXT_PRIVATE_DEBUG_CACHE": "true",
+                // When deployed locally, we don't have access to the tag cache here,
+                // we should just bypass the cache to go to the server directly
+                "SHOULD_BYPASS_CACHE": "true",
+                "OPEN_NEXT_REQUEST_ID_HEADER": "true",
+                "GITBOOK_URL": "http://localhost:8771"
             },
             "r2_buckets": [
                 {
@@ -85,7 +90,8 @@
         "staging": {
             "vars": {
                 "STAGE": "staging",
-                "WORKER_VERSION_ID": "TO_REPLACE"
+                "WORKER_VERSION_ID": "TO_REPLACE",
+                "OPEN_NEXT_REQUEST_ID_HEADER": "true"
             },
             "routes": [
                 {
@@ -153,7 +159,8 @@
                 // TODO: remove this once the issue is fixed
                 "DEBUG_CLOUDFLARE": "true",
                 "WORKER_VERSION_ID": "TO_REPLACE",
-                "STAGE": "production"
+                "STAGE": "production",
+                "OPEN_NEXT_REQUEST_ID_HEADER": "true"
             },
             "routes": [
                 {

packages/gitbook/openNext/customWorkers/script/updateWrangler.ts

@@ -11,7 +11,7 @@ const args = process.argv.slice(2);
 const versionId = args[0];
 
 // The preview URL is in the format https://<versionId>-gitbook-open-v2-server-preview.gitbook.workers.dev
-const previewHostname = `${versionId.split('-')[0]}-gitbook-open-v2-server-preview.gitbook.workers.dev`;
+const previewHostname = `${versionId?.split('-')[0]}-gitbook-open-v2-server-preview.gitbook.workers.dev`;
 
 let updatedFile = file.replace(
     /"PREVIEW_HOSTNAME": "TO_REPLACE"/,

packages/gitbook/openNext/incrementalCache.ts

@@ -1,6 +1,4 @@
 import { createHash } from 'node:crypto';
-
-import { trace } from '@/lib/tracing';
 import type {
     CacheEntryType,
     CacheValue,
@@ -9,6 +7,8 @@ import type {
 } from '@opennextjs/aws/types/overrides.js';
 import { getCloudflareContext } from '@opennextjs/cloudflare';
 
+import { withRegionalCache } from '@opennextjs/cloudflare/overrides/incremental-cache/regional-cache';
+
 import type { DurableObjectNamespace, Rpc } from '@cloudflare/workers-types';
 
 export const BINDING_NAME = 'NEXT_INC_CACHE_R2_BUCKET';
@@ -20,55 +20,42 @@ export type KeyOptions = {
 
 /**
  *
- * It is very similar to the `R2IncrementalCache` in the `@opennextjs/cloudflare` package, but it allow us to trace
- * the cache operations. It also integrates both R2 and Cache API in a single class.
- * Having our own, will allow us to customize it in the future if needed.
+ * It is very similar to the `R2IncrementalCache` in the `@opennextjs/cloudflare` package, but it has an additional
+ * R2WriteBuffer Durable Object to handle writes to R2. Given how we set up cache, we often end up writing to the same key too fast.
  */
 class GitbookIncrementalCache implements IncrementalCache {
     name = 'GitbookIncrementalCache';
 
-    protected localCache: Cache | undefined;
-
     async get<CacheType extends CacheEntryType = 'cache'>(
         key: string,
         cacheType?: CacheType
     ): Promise<WithLastModified<CacheValue<CacheType>> | null> {
         const cacheKey = this.getR2Key(key, cacheType);
-        return trace(
-            {
-                operation: 'openNextIncrementalCacheGet',
-                name: cacheKey,
-            },
-            async (span) => {
-                span.setAttribute('cacheType', cacheType ?? 'cache');
-                const r2 = getCloudflareContext().env[BINDING_NAME];
-                const localCache = await this.getCacheInstance();
-                if (!r2) throw new Error('No R2 bucket');
-                try {
-                    // Check local cache first if available
-                    const localCacheEntry = await localCache.match(this.getCacheUrlKey(cacheKey));
-                    if (localCacheEntry) {
-                        span.setAttribute('cacheHit', 'local');
-                        const result = (await localCacheEntry.json()) as WithLastModified<
-                            CacheValue<CacheType>
-                        >;
-                        return this.returnNullOn404(result);
-                    }
 
-                    const r2Object = await r2.get(cacheKey);
-                    if (!r2Object) return null;
+        const r2 = getCloudflareContext().env[BINDING_NAME];
+        if (!r2) throw new Error('No R2 bucket');
+        if (process.env.SHOULD_BYPASS_CACHE === 'true') {
+            // We are in a local middleware environment, we should bypass the cache
+            // and go directly to the server.
+            return null;
+        }
+        try {
+            const r2Object = await r2.get(cacheKey);
+            if (!r2Object) return null;
 
-                    span.setAttribute('cacheHit', 'r2');
-                    return this.returnNullOn404({
-                        value: await r2Object.json(),
-                        lastModified: r2Object.uploaded.getTime(),
-                    });
-                } catch (e) {
-                    console.error('Failed to get from cache', e);
-                    return null;
-                }
-            }
-        );
+            const json = (await r2Object.json()) as CacheValue<CacheType>;
+            const lastModified = r2Object.uploaded.getTime();
+
+            if (!json) return null;
+
+            return this.returnNullOn404({
+                value: json,
+                lastModified,
+            });
+        } catch (e) {
+            console.error('Failed to get from cache', e);
+            return null;
+        }
     }
 
     //TODO: This is a workaround to handle 404 responses in the cache.
@@ -89,97 +76,49 @@ class GitbookIncrementalCache implements IncrementalCache {
         cacheType?: CacheType
     ): Promise<void> {
         const cacheKey = this.getR2Key(key, cacheType);
-        return trace(
-            {
-                operation: 'openNextIncrementalCacheSet',
-                name: cacheKey,
-            },
-            async (span) => {
-                span.setAttribute('cacheType', cacheType ?? 'cache');
-                const localCache = await this.getCacheInstance();
 
-                try {
-                    await this.writeToR2(cacheKey, JSON.stringify(value));
-
-                    //TODO: Check if there is any places where we don't have tags
-                    // Ideally we should always have tags, but in case we don't, we need to decide how to handle it
-                    // For now we default to a build ID tag, which allow us to invalidate the cache in case something is wrong in this deployment
-                    const tags = this.getTagsFromCacheEntry(value) ?? [
-                        `build_id/${process.env.NEXT_BUILD_ID}`,
-                    ];
-
-                    // We consider R2 as the source of truth, so we update the local cache
-                    // only after a successful R2 write
-                    await localCache.put(
-                        this.getCacheUrlKey(cacheKey),
-                        new Response(
-                            JSON.stringify({
-                                value,
-                                // Note: `Date.now()` returns the time of the last IO rather than the actual time.
-                                //       See https://developers.cloudflare.com/workers/reference/security-model/
-                                lastModified: Date.now(),
-                            }),
-                            {
-                                headers: {
-                                    // Cache-Control default to 30 minutes, will be overridden by `revalidate`
-                                    // In theory we should always get the `revalidate` value
-                                    'cache-control': `max-age=${value.revalidate ?? 60 * 30}`,
-                                    'cache-tag': tags.join(','),
-                                },
-                            }
-                        )
-                    );
-                } catch (e) {
-                    console.error('Failed to set to cache', e);
-                }
-            }
-        );
+        try {
+            await this.writeToR2(cacheKey, JSON.stringify(value));
+        } catch (e) {
+            console.error('Failed to set to cache', e);
+        }
     }
 
     async delete(key: string): Promise<void> {
         const cacheKey = this.getR2Key(key);
-        return trace(
-            {
-                operation: 'openNextIncrementalCacheDelete',
-                name: cacheKey,
-            },
-            async () => {
-                const r2 = getCloudflareContext().env[BINDING_NAME];
-                const localCache = await this.getCacheInstance();
-                if (!r2) throw new Error('No R2 bucket');
 
-                try {
-                    await r2.delete(cacheKey);
+        const r2 = getCloudflareContext().env[BINDING_NAME];
+        if (!r2) throw new Error('No R2 bucket');
 
-                    // Here again R2 is the source of truth, so we delete from local cache first
-                    await localCache.delete(this.getCacheUrlKey(cacheKey));
-                } catch (e) {
-                    console.error('Failed to delete from cache', e);
-                }
-            }
-        );
+        try {
+            await r2.delete(cacheKey);
+        } catch (e) {
+            console.error('Failed to delete from cache', e);
+        }
     }
 
     async writeToR2(key: string, value: string): Promise<void> {
-        const env = getCloudflareContext().env as {
-            WRITE_BUFFER: DurableObjectNamespace<
-                Rpc.DurableObjectBranded & {
-                    write: (key: string, value: string) => Promise<void>;
-                }
-            >;
-        };
-        const id = env.WRITE_BUFFER.idFromName(key);
+        try {
+            const env = getCloudflareContext().env as {
+                WRITE_BUFFER: DurableObjectNamespace<
+                    Rpc.DurableObjectBranded & {
+                        write: (key: string, value: string) => Promise<void>;
+                    }
+                >;
+            };
+            const id = env.WRITE_BUFFER.idFromName(key);
 
-        // A stub is a client used to invoke methods on the Durable Object
-        const stub = env.WRITE_BUFFER.get(id);
+            // A stub is a client used to invoke methods on the Durable Object
+            const stub = env.WRITE_BUFFER.get(id);
 
-        await stub.write(key, value);
-    }
-
-    async getCacheInstance(): Promise<Cache> {
-        if (this.localCache) return this.localCache;
-        this.localCache = await caches.open('incremental-cache');
-        return this.localCache;
+            await stub.write(key, value);
+        } catch {
+            // We fallback to writing directly to R2
+            // it can fail locally because the limit is 1Mb per args
+            // It is 32Mb in production, so we should be fine
+            const r2 = getCloudflareContext().env[BINDING_NAME];
+            r2?.put(key, value);
+        }
     }
 
     // Utility function to generate keys for R2/Cache API
@@ -197,28 +136,13 @@ class GitbookIncrementalCache implements IncrementalCache {
             '/'
         );
     }
-
-    getCacheUrlKey(cacheKey: string): string {
-        return `http://cache.local/${cacheKey}`;
-    }
-
-    getTagsFromCacheEntry<CacheType extends CacheEntryType>(
-        entry: CacheValue<CacheType>
-    ): string[] | undefined {
-        if ('tags' in entry && entry.tags) {
-            return entry.tags;
-        }
-
-        if ('meta' in entry && entry.meta && 'headers' in entry.meta && entry.meta.headers) {
-            const rawTags = entry.meta.headers['x-next-cache-tags'];
-            if (typeof rawTags === 'string') {
-                return rawTags.split(',');
-            }
-        }
-        if ('value' in entry) {
-            return entry.tags;
-        }
-    }
 }
 
-export default new GitbookIncrementalCache();
+export default withRegionalCache(new GitbookIncrementalCache(), {
+    mode: 'long-lived',
+    // We can do it because we use our own logic to invalidate the cache
+    bypassTagCacheOnCacheHit: true,
+    defaultLongLivedTtlSec: 60 * 60 * 24 /* 24 hours */,
+    // We don't want to update the cache entry on every cache hit
+    shouldLazilyUpdateOnCacheHit: false,
+});

packages/gitbook/openNext/queue/middleware.ts

@@ -1,4 +1,3 @@
-import { trace } from '@/lib/tracing';
 import type { Queue } from '@opennextjs/aws/types/overrides.js';
 import { getCloudflareContext } from '@opennextjs/cloudflare';
 import doQueue from '@opennextjs/cloudflare/overrides/queue/do-queue';
@@ -6,9 +5,7 @@ import doQueue from '@opennextjs/cloudflare/overrides/queue/do-queue';
 export default {
     name: 'GitbookISRQueue',
     send: async (msg) => {
-        return trace({ operation: 'gitbookISRQueueSend', name: msg.MessageBody.url }, async () => {
-            const { ctx } = getCloudflareContext();
-            ctx.waitUntil(doQueue.send(msg));
-        });
+        const { ctx } = getCloudflareContext();
+        ctx.waitUntil(doQueue.send(msg));
     },
 } satisfies Queue;

packages/gitbook/openNext/queue/server.ts

@@ -1,9 +1,11 @@
+import { getLogger } from '@/lib/logger';
 import type { Queue } from '@opennextjs/aws/types/overrides.js';
 
 export default {
     name: 'GitbookISRQueue',
     send: async (msg) => {
+        const logger = getLogger().subLogger('GitbookISRQueue');
         // We should never reach this point in the server. If that's the case, we should log it.
-        console.warn('GitbookISRQueue: send called on server side, this should not happen.', msg);
+        logger.warn('send called on server side, this should not happen.', msg);
     },
 } satisfies Queue;

packages/gitbook/openNext/tagCache/middleware.ts

@@ -1,4 +1,4 @@
-import { trace } from '@/lib/tracing';
+import { createLogger, getLogger } from '@/lib/logger';
 import type { NextModeTagCache } from '@opennextjs/aws/types/overrides.js';
 import doShardedTagCache from '@opennextjs/cloudflare/overrides/tag-cache/do-sharded-tag-cache';
 import { softTagFilter } from '@opennextjs/cloudflare/overrides/tag-cache/tag-cache-filter';
@@ -6,8 +6,9 @@ import { softTagFilter } from '@opennextjs/cloudflare/overrides/tag-cache/tag-ca
 const originalTagCache = doShardedTagCache({
     baseShardSize: 12,
     regionalCache: true,
-    // We can probably increase this value even further
-    regionalCacheTtlSec: 60,
+    regionalCacheTtlSec: 60 * 5 /* 5 minutes */,
+    // Because we invalidate the Cache API on update, we can safely set this to true
+    regionalCacheDangerouslyPersistMissingTags: true,
     shardReplication: {
         numberOfSoftReplicas: 2,
         numberOfHardReplicas: 1,
@@ -20,62 +21,39 @@ const originalTagCache = doShardedTagCache({
 export default {
     name: 'GitbookTagCache',
     mode: 'nextMode',
+    // We don't really use this one, as of now it is only used for soft tags
     getLastRevalidated: async (tags: string[]) => {
         const tagsToCheck = tags.filter(softTagFilter);
         if (tagsToCheck.length === 0) {
-            // If we reach here, it probably means that there is an issue that we'll need to address.
-            console.warn(
-                'getLastRevalidated - No valid tags to check for last revalidation, original tags:',
-                tags
-            );
             return 0; // If no tags to check, return 0
         }
-        return trace(
-            {
-                operation: 'gitbookTagCacheGetLastRevalidated',
-                name: tagsToCheck.join(', '),
-            },
-            async () => {
-                return await originalTagCache.getLastRevalidated(tagsToCheck);
-            }
-        );
+
+        return await originalTagCache.getLastRevalidated(tagsToCheck);
     },
     hasBeenRevalidated: async (tags: string[], lastModified?: number) => {
-        const tagsToCheck = tags.filter(softTagFilter);
-        if (tagsToCheck.length === 0) {
-            // If we reach here, it probably means that there is an issue that we'll need to address.
-            console.warn(
-                'hasBeenRevalidated - No valid tags to check for revalidation, original tags:',
-                tags
-            );
-            return false; // If no tags to check, return false
-        }
-        return trace(
-            {
-                operation: 'gitbookTagCacheHasBeenRevalidated',
-                name: tagsToCheck.join(', '),
-            },
-            async () => {
-                const result = await originalTagCache.hasBeenRevalidated(tagsToCheck, lastModified);
-                return result;
+        try {
+            const tagsToCheck = tags.filter(softTagFilter);
+            if (tagsToCheck.length === 0) {
+                return false; // If no tags to check, return false
             }
-        );
+
+            return await originalTagCache.hasBeenRevalidated(tagsToCheck, lastModified);
+        } catch (e) {
+            createLogger('gitbookTagCache', {}).error(
+                `hasBeenRevalidated - Error checking tags ${tags.join(', ')}`,
+                e
+            );
+            return false; // In case of error, return false
+        }
     },
     writeTags: async (tags: string[]) => {
-        return trace(
-            {
-                operation: 'gitbookTagCacheWriteTags',
-                name: tags.join(', '),
-            },
-            async () => {
-                const tagsToWrite = tags.filter(softTagFilter);
-                if (tagsToWrite.length === 0) {
-                    console.warn('writeTags - No valid tags to write');
-                    return; // If no tags to write, exit early
-                }
-                // Write only the filtered tags
-                await originalTagCache.writeTags(tagsToWrite);
-            }
-        );
+        const tagsToWrite = tags.filter(softTagFilter);
+        if (tagsToWrite.length === 0) {
+            const logger = getLogger().subLogger('gitbookTagCache');
+            logger.warn('writeTags - No valid tags to write');
+            return; // If no tags to write, exit early
+        }
+
+        await originalTagCache.writeTags(tagsToWrite);
     },
 } satisfies NextModeTagCache;

packages/gitbook/package.json

@@ -1,79 +1,87 @@
 {
     "name": "gitbook",
-    "version": "0.13.1",
+    "version": "0.19.0",
     "private": true,
     "dependencies": {
         "@gitbook/api": "catalog:",
+        "@gitbook/expr": "workspace:*",
+        "@gitbook/browser-types": "workspace:*",
         "@gitbook/cache-tags": "workspace:*",
-        "@opennextjs/cloudflare": "1.2.1",
-        "@sindresorhus/fnv1a": "^3.1.0",
-        "assert-never": "^1.2.1",
-        "jwt-decode": "^4.0.0",
-        "next": "^15.3.2",
-        "react": "^19.0.0",
-        "react-dom": "^19.0.0",
-        "rison": "^0.1.1",
-        "server-only": "^0.0.1",
-        "warn-once": "^0.1.1",
-        "object-identity": "^0.1.2",
         "@gitbook/colors": "workspace:*",
         "@gitbook/emoji-codepoints": "workspace:*",
-        "@gitbook/icons": "workspace:*",
         "@gitbook/fonts": "workspace:*",
+        "@gitbook/icons": "workspace:*",
         "@gitbook/openapi-parser": "workspace:*",
         "@gitbook/react-contentkit": "workspace:*",
         "@gitbook/react-math": "workspace:*",
         "@gitbook/react-openapi": "workspace:*",
+        "@modelcontextprotocol/sdk": "^1.17.5",
+        "@opennextjs/cloudflare": "^1.8.3",
         "@radix-ui/react-checkbox": "^1.0.4",
         "@radix-ui/react-dropdown-menu": "^2.1.12",
+        "@radix-ui/react-hover-card": "^1.1.15",
         "@radix-ui/react-navigation-menu": "^1.2.3",
         "@radix-ui/react-popover": "^1.0.7",
         "@radix-ui/react-tooltip": "^1.1.8",
+        "@sindresorhus/fnv1a": "^3.1.0",
         "@tailwindcss/container-queries": "^0.1.1",
         "@tailwindcss/typography": "^0.5.16",
+        "@tusbar/cache-control": "^1.0.2",
         "ai": "^4.2.2",
+        "assert-never": "^1.2.1",
+        "bidc": "catalog:",
         "bun-types": "^1.1.20",
         "classnames": "^2.5.1",
+        "direction": "^2.0.1",
         "event-iterator": "^2.0.0",
         "framer-motion": "^10.16.14",
+        "image-size": "^2.0.2",
         "js-cookie": "^3.0.5",
         "jsontoxml": "^1.0.1",
+        "jwt-decode": "^4.0.0",
         "katex": "^0.16.9",
         "mathjax": "^3.2.2",
-        "mdast-util-to-markdown": "^2.1.2",
+        "mcp-handler": "^1.0.2",
         "mdast-util-from-markdown": "^2.0.2",
         "mdast-util-frontmatter": "^2.0.1",
         "mdast-util-gfm": "^3.1.0",
-        "micromark-extension-gfm": "^3.0.0",
-        "micromark-extension-frontmatter": "^2.0.0",
-        "unist-util-remove": "^4.0.0",
-        "unist-util-visit": "^5.0.0",
+        "mdast-util-to-markdown": "^2.1.2",
         "memoizee": "^0.4.17",
-        "next-themes": "^0.2.1",
+        "micromark-extension-frontmatter": "^2.0.0",
+        "micromark-extension-gfm": "^3.0.0",
+        "motion": "^12.23.12",
+        "next": "15.4.0",
+        "next-themes": "^0.4.6",
         "nuqs": "^2.2.3",
         "object-hash": "^3.0.0",
+        "object-identity": "^0.1.2",
         "openapi-types": "^12.1.3",
         "p-map": "^7.0.3",
-        "parse-cache-control": "^1.0.1",
+        "quick-lru": "^7.0.1",
         "react-hotkeys-hook": "^4.4.1",
         "rehype-sanitize": "^6.0.0",
         "rehype-stringify": "^10.0.1",
         "remark-gfm": "^4.0.1",
         "remark-parse": "^11.0.0",
         "remark-rehype": "^11.1.1",
+        "rison": "^0.1.1",
+        "server-only": "^0.0.1",
         "shiki": "^3.2.0",
         "tailwind-merge": "^2.2.0",
         "tailwind-shades": "^1.1.2",
         "unified": "^11.0.5",
+        "unist-util-remove": "^4.0.0",
+        "unist-util-visit": "^5.0.0",
         "url-join": "^5.0.0",
         "usehooks-ts": "^3.1.0",
-        "zustand": "^5.0.3",
-        "image-size": "^2.0.2",
-        "direction": "^2.0.1"
+        "warn-once": "^0.1.1",
+        "zod": "^3",
+        "zustand": "^5.0.3"
     },
     "devDependencies": {
-        "@argos-ci/playwright": "^5.0.5",
-        "@playwright/test": "^1.51.1",
+        "@argos-ci/playwright": "^5.0.9",
+        "@playwright/test": "^1.54.2",
+        "@tailwindcss/postcss": "^4.1.11",
         "@types/js-cookie": "^3.0.6",
         "@types/jsontoxml": "^1.0.5",
         "@types/jsonwebtoken": "^9.0.6",
@@ -81,36 +89,37 @@
         "@types/node": "^20",
         "@types/object-hash": "^3.0.6",
         "@types/parse-cache-control": "^1.0.4",
-        "@types/psi": "^4.1.6",
         "@types/react": "18.3.13",
         "@types/react-dom": "18.3.1",
         "@types/rison": "^0.0.9",
-        "autoprefixer": "^10",
         "deepmerge": "^4.3.1",
         "env-cmd": "^10.1.0",
         "jsonwebtoken": "^9.0.2",
         "postcss": "^8",
-        "psi": "^4.1.0",
         "stylelint": "^16.16.0",
-        "tailwindcss": "^3.4.0",
+        "tailwindcss": "^4.1.11",
         "ts-essentials": "^10.0.1",
         "typescript": "^5.5.3",
         "vercel": "^39.3.0"
     },
     "scripts": {
-        "generate": "gitbook-icons ./public/~gitbook/static/icons custom-icons && gitbook-math ./public/~gitbook/static/math && wrangler types",
-        "copy:icons": "gitbook-icons ./public/~gitbook/static/icons",
+        "generate": "./scripts/generate.sh",
         "clean": "rm -rf ./.next && rm -rf ./public/~gitbook/static/icons && rm -rf ./public/~gitbook/static/math",
-        "dev": "env-cmd --silent -f ../../.env.local next --turbopack",
+        "dev": "env-cmd --silent -f ../../.env.local next",
         "build": "next build",
-        "start": "next start",
+        "build:local": "GITBOOK_URL=http://localhost:3000 next build",
+        "start": "GITBOOK_URL=http://localhost:3000 next start",
         "build:cloudflare": "opennextjs-cloudflare build",
         "dev:cloudflare": "wrangler dev --port 8771 --env preview",
         "dev:cf:middleware": "wrangler dev --port 8771 --inspector-port 9230 --env dev --config ./openNext/customWorkers/middlewareWrangler.jsonc",
         "dev:cf:server": "wrangler dev --port 8772 --env dev --config ./openNext/customWorkers/defaultWrangler.jsonc",
-        "e2e": "playwright test e2e/internal.spec.ts e2e/pdf.spec.ts",
-        "e2e-customers": "playwright test e2e/customers.spec.ts",
+        "e2e": "playwright test e2e/internal.spec.ts e2e/pdf.spec.ts --project=chromium",
+        "e2e-customers": "playwright test e2e/customers.spec.ts --project=chromium",
         "unit": "bun test {src,packages} --preload ./tests/preload-bun.ts",
+        "e2e-browserless": "bun test ./tests/",
         "typecheck": "tsc --noEmit"
-    }
+    },
+    "browserslist": [
+        ">0.3%, chrome >= 64, edge >= 79, firefox >= 67, opera >= 51, safari >= 12 and not dead"
+    ]
 }

packages/gitbook/playwright.config.ts

@@ -10,9 +10,15 @@ export default defineConfig({
         ['@argos-ci/playwright/reporter', { uploadToArgos: !!process.env.CI }],
     ],
     projects: [
+        // To speed up CI, we only test on Chrome.
+        // https://github.com/microsoft/playwright/issues/14434
+        // https://playwright.dev/docs/browsers#google-chrome--microsoft-edge
         {
             name: 'chromium',
-            use: { ...devices['Desktop Chrome'] },
+            use: {
+                ...devices['Desktop Chrome'],
+                channel: 'chrome',
+            },
         },
     ],
     use: {

packages/gitbook/postcss.config.js

@@ -1,6 +1,5 @@
 module.exports = {
     plugins: {
-        tailwindcss: {},
-        autoprefixer: {},
+        '@tailwindcss/postcss': {},
     },
 };

packages/gitbook/scripts/clean.sh

@@ -0,0 +1,9 @@
+#!/bin/bash
+
+set -o errexit
+set -o pipefail
+
+rm -rf ./.next
+rm -rf ./public/~gitbook/static/icons
+rm -rf ./public/~gitbook/static/math
+rm -rf ./public/~gitbook/static/embed

packages/gitbook/scripts/generate.sh

@@ -0,0 +1,12 @@
+#!/bin/bash
+
+set -o errexit
+set -o pipefail
+
+# Copy the assets
+gitbook-icons ./public/~gitbook/static/icons custom-icons
+gitbook-math ./public/~gitbook/static/math
+cp -r ../embed/standalone/ ./public/~gitbook/static/embed
+
+# Generate the types
+wrangler types

packages/gitbook/src/app/sites/dynamic/[mode]/[siteURL]/[siteData]/(content)/layout.tsx

@@ -5,8 +5,9 @@ import {
     generateSiteLayoutMetadata,
     generateSiteLayoutViewport,
 } from '@/components/SiteLayout';
-import { GITBOOK_DISABLE_TRACKING } from '@/lib/env';
 import { getThemeFromMiddleware } from '@/lib/middleware';
+import { shouldTrackEvents } from '@/lib/tracking';
+import { headers } from 'next/headers';
 
 interface SiteDynamicLayoutProps {
     params: Promise<RouteLayoutParams>;
@@ -18,13 +19,14 @@ export default async function SiteDynamicLayout({
 }: React.PropsWithChildren<SiteDynamicLayoutProps>) {
     const { context, visitorAuthClaims } = await getDynamicSiteContext(await params);
     const forcedTheme = await getThemeFromMiddleware();
+    const withTracking = shouldTrackEvents(await headers());
 
     return (
-        <CustomizationRootLayout forcedTheme={forcedTheme} customization={context.customization}>
+        <CustomizationRootLayout forcedTheme={forcedTheme} context={context}>
             <SiteLayout
                 context={context}
                 forcedTheme={forcedTheme}
-                withTracking={!GITBOOK_DISABLE_TRACKING}
+                withTracking={withTracking}
                 visitorAuthClaims={visitorAuthClaims}
             >
                 {children}

packages/gitbook/src/app/sites/dynamic/[mode]/[siteURL]/[siteData]/~gitbook/embed/assistant/page.tsx

@@ -0,0 +1,16 @@
+import type { RouteLayoutParams } from '@/app/utils';
+import { EmbeddableAssistantPage } from '@/components/Embeddable';
+import { getEmbeddableDynamicContext } from '@/lib/embeddable';
+
+export const dynamic = 'force-static';
+
+type PageProps = {
+    params: Promise<RouteLayoutParams>;
+};
+
+export default async function Page(props: PageProps) {
+    const params = await props.params;
+    const { context } = await getEmbeddableDynamicContext(params);
+
+    return <EmbeddableAssistantPage context={context} />;
+}

packages/gitbook/src/app/sites/dynamic/[mode]/[siteURL]/[siteData]/~gitbook/embed/layout.tsx

@@ -0,0 +1,41 @@
+import type { RouteLayoutParams } from '@/app/utils';
+import {
+    EmbeddableRootLayout,
+    generateEmbeddableMetadata,
+    generateEmbeddableViewport,
+} from '@/components/Embeddable';
+import { getEmbeddableStaticContext } from '@/lib/embeddable';
+import { shouldTrackEvents } from '@/lib/tracking';
+import { headers } from 'next/headers';
+
+interface SiteStaticLayoutProps {
+    params: Promise<RouteLayoutParams>;
+}
+
+export default async function RootLayout({
+    params,
+    children,
+}: React.PropsWithChildren<SiteStaticLayoutProps>) {
+    const { context, visitorAuthClaims } = await getEmbeddableStaticContext(await params);
+    const withTracking = shouldTrackEvents(await headers());
+
+    return (
+        <EmbeddableRootLayout
+            context={context}
+            withTracking={withTracking}
+            visitorAuthClaims={visitorAuthClaims}
+        >
+            {children}
+        </EmbeddableRootLayout>
+    );
+}
+
+export async function generateViewport({ params }: SiteStaticLayoutProps) {
+    const { context } = await getEmbeddableStaticContext(await params);
+    return generateEmbeddableViewport({ context });
+}
+
+export async function generateMetadata({ params }: SiteStaticLayoutProps) {
+    const { context } = await getEmbeddableStaticContext(await params);
+    return generateEmbeddableMetadata({ context });
+}

packages/gitbook/src/app/sites/dynamic/[mode]/[siteURL]/[siteData]/~gitbook/embed/page/[pagePath]/page.tsx

@@ -0,0 +1,23 @@
+import { type RouteParams, getPagePathFromParams } from '@/app/utils';
+import { EmbeddableDocsPage, generateEmbeddableDocsPageMetadata } from '@/components/Embeddable';
+import { getEmbeddableDynamicContext } from '@/lib/embeddable';
+import type { Metadata } from 'next';
+
+type PageProps = {
+    params: Promise<RouteParams>;
+};
+
+export default async function Page(props: PageProps) {
+    const params = await props.params;
+    const { context } = await getEmbeddableDynamicContext(params);
+    const pathname = getPagePathFromParams(params);
+
+    return <EmbeddableDocsPage context={context} pageParams={{ pathname }} />;
+}
+
+export async function generateMetadata(props: PageProps): Promise<Metadata> {
+    const params = await props.params;
+    const { context } = await getEmbeddableDynamicContext(params);
+    const pathname = getPagePathFromParams(params);
+    return generateEmbeddableDocsPageMetadata({ context, pageParams: { pathname } });
+}

packages/gitbook/src/app/sites/static/[mode]/[siteURL]/[siteData]/(content)/layout.tsx

@@ -5,7 +5,7 @@ import {
     generateSiteLayoutMetadata,
     generateSiteLayoutViewport,
 } from '@/components/SiteLayout';
-import { GITBOOK_DISABLE_TRACKING } from '@/lib/env';
+import { shouldTrackEvents } from '@/lib/tracking';
 
 interface SiteStaticLayoutProps {
     params: Promise<RouteLayoutParams>;
@@ -16,12 +16,13 @@ export default async function SiteStaticLayout({
     children,
 }: React.PropsWithChildren<SiteStaticLayoutProps>) {
     const { context, visitorAuthClaims } = await getStaticSiteContext(await params);
+    const withTracking = shouldTrackEvents();
 
     return (
-        <CustomizationRootLayout customization={context.customization}>
+        <CustomizationRootLayout context={context}>
             <SiteLayout
                 context={context}
-                withTracking={!GITBOOK_DISABLE_TRACKING}
+                withTracking={withTracking}
                 visitorAuthClaims={visitorAuthClaims}
             >
                 {children}

packages/gitbook/src/app/sites/static/[mode]/[siteURL]/[siteData]/llms-full.txt/[page]/route.ts

@@ -0,0 +1,20 @@
+import type { NextRequest } from 'next/server';
+
+import { type RouteLayoutParams, getStaticSiteContext } from '@/app/utils';
+import { serveLLMsFullTxt } from '@/routes/llms-full';
+
+export const dynamic = 'force-static';
+
+export async function GET(
+    _request: NextRequest,
+    { params }: { params: Promise<RouteLayoutParams & { page: string }> }
+) {
+    const awaitedParams = await params;
+    const page = Number(awaitedParams.page);
+    // If page is not a number, not an integer, or less than 0, return an error
+    if (Number.isNaN(page) || !Number.isInteger(page) || page < 0) {
+        return new Response('Invalid page', { status: 400 });
+    }
+    const { context } = await getStaticSiteContext(awaitedParams);
+    return serveLLMsFullTxt(context, page);
+}

packages/gitbook/src/app/sites/static/[mode]/[siteURL]/[siteData]/~gitbook/embed/assistant/page.tsx

@@ -0,0 +1,16 @@
+import type { RouteLayoutParams } from '@/app/utils';
+import { EmbeddableAssistantPage } from '@/components/Embeddable';
+import { getEmbeddableStaticContext } from '@/lib/embeddable';
+
+export const dynamic = 'force-static';
+
+type PageProps = {
+    params: Promise<RouteLayoutParams>;
+};
+
+export default async function Page(props: PageProps) {
+    const params = await props.params;
+    const { context } = await getEmbeddableStaticContext(params);
+
+    return <EmbeddableAssistantPage context={context} />;
+}

packages/gitbook/src/app/sites/static/[mode]/[siteURL]/[siteData]/~gitbook/embed/demo/route.ts

@@ -0,0 +1,129 @@
+import { type RouteLayoutParams, getStaticSiteContext } from '@/app/utils';
+import type { NextRequest } from 'next/server';
+
+export const dynamic = 'force-static';
+
+/**
+ * This route serves a quick demo to test the script.js script.
+ * It is not used in production.
+ */
+export async function GET(
+    _request: NextRequest,
+    { params }: { params: Promise<RouteLayoutParams> }
+) {
+    const { context } = await getStaticSiteContext(await params);
+
+    return new Response(
+        `
+<html>
+    <head>
+        <meta name="color-scheme" content="light dark">
+    </head>
+    <body>
+        <svg style="position: absolute; bottom: 6rem; right: 4rem;" width="719" height="644" viewBox="0 0 719 644" fill="none" xmlns="http://www.w3.org/2000/svg">
+            <rect opacity="0.1" x="0.566895" y="208" width="529.567" height="228" rx="16" fill="#A4A7B0"/>
+            <g opacity="0.2">
+                <line x1="141.567" y1="472" x2="4.56689" y2="472" stroke="#A4A7B0" stroke-width="8" stroke-linecap="round"/>
+                <line x1="416.067" y1="472" x2="165.567" y2="472" stroke="#A4A7B0" stroke-width="8" stroke-linecap="round"/>
+                <line x1="526.567" y1="472" x2="440.067" y2="472" stroke="#A4A7B0" stroke-width="8" stroke-linecap="round"/>
+                <line x1="194.567" y1="496" x2="4.56689" y2="496" stroke="#A4A7B0" stroke-width="8" stroke-linecap="round"/>
+                <line x1="324.067" y1="496" x2="218.567" y2="496" stroke="#A4A7B0" stroke-width="8" stroke-linecap="round"/>
+                <line x1="473.567" y1="496" x2="348.067" y2="496" stroke="#A4A7B0" stroke-width="8" stroke-linecap="round"/>
+                <line x1="231.901" y1="520" x2="4.56689" y2="520" stroke="#A4A7B0" stroke-width="8" stroke-linecap="round"/>
+                <line x1="291.186" y1="520" x2="255.901" y2="520" stroke="#A4A7B0" stroke-width="8" stroke-linecap="round"/>
+                <line x1="442.058" y1="520" x2="315.186" y2="520" stroke="#A4A7B0" stroke-width="8" stroke-linecap="round"/>
+                <line x1="526.567" y1="520" x2="466.058" y2="520" stroke="#A4A7B0" stroke-width="8" stroke-linecap="round"/>
+                <line x1="141.567" y1="544" x2="4.56689" y2="544" stroke="#A4A7B0" stroke-width="8" stroke-linecap="round"/>
+                <line x1="348.191" y1="544" x2="165.567" y2="544" stroke="#A4A7B0" stroke-width="8" stroke-linecap="round"/>
+                <line x1="184.017" y1="592" x2="4.56689" y2="592" stroke="#A4A7B0" stroke-width="8" stroke-linecap="round"/>
+                <line x1="312.848" y1="592" x2="208.017" y2="592" stroke="#A4A7B0" stroke-width="8" stroke-linecap="round"/>
+                <line x1="386.574" y1="592" x2="336.848" y2="592" stroke="#A4A7B0" stroke-width="8" stroke-linecap="round"/>
+                <line x1="448.401" y1="592" x2="410.574" y2="592" stroke="#A4A7B0" stroke-width="8" stroke-linecap="round"/>
+                <line x1="126.633" y1="616" x2="4.56689" y2="616" stroke="#A4A7B0" stroke-width="8" stroke-linecap="round"/>
+                <line x1="401.133" y1="616" x2="150.633" y2="616" stroke="#A4A7B0" stroke-width="8" stroke-linecap="round"/>
+                <line x1="526.567" y1="616" x2="425.133" y2="616" stroke="#A4A7B0" stroke-width="8" stroke-linecap="round"/>
+                <line x1="179.457" y1="640" x2="4.56689" y2="640" stroke="#A4A7B0" stroke-width="8" stroke-linecap="round"/>
+                <line x1="329.569" y1="640" x2="203.457" y2="640" stroke="#A4A7B0" stroke-width="8" stroke-linecap="round"/>
+            </g>
+            <g opacity="0.2">
+                <line x1="141.567" y1="4" x2="4.56689" y2="4" stroke="#A4A7B0" stroke-width="8" stroke-linecap="round"/>
+                <line x1="416.067" y1="4" x2="165.567" y2="4" stroke="#A4A7B0" stroke-width="8" stroke-linecap="round"/>
+                <line x1="526.567" y1="4" x2="440.067" y2="4" stroke="#A4A7B0" stroke-width="8" stroke-linecap="round"/>
+                <line x1="194.567" y1="28" x2="4.56689" y2="28" stroke="#A4A7B0" stroke-width="8" stroke-linecap="round"/>
+                <line x1="324.067" y1="28" x2="218.567" y2="28" stroke="#A4A7B0" stroke-width="8" stroke-linecap="round"/>
+                <line x1="473.567" y1="28" x2="348.067" y2="28" stroke="#A4A7B0" stroke-width="8" stroke-linecap="round"/>
+                <line x1="231.901" y1="52" x2="4.56689" y2="52" stroke="#A4A7B0" stroke-width="8" stroke-linecap="round"/>
+                <line x1="291.186" y1="52" x2="255.901" y2="52" stroke="#A4A7B0" stroke-width="8" stroke-linecap="round"/>
+                <line x1="442.058" y1="52" x2="315.186" y2="52" stroke="#A4A7B0" stroke-width="8" stroke-linecap="round"/>
+                <line x1="526.567" y1="52" x2="466.058" y2="52" stroke="#A4A7B0" stroke-width="8" stroke-linecap="round"/>
+                <line x1="141.567" y1="76" x2="4.56689" y2="76" stroke="#A4A7B0" stroke-width="8" stroke-linecap="round"/>
+                <line x1="348.191" y1="76" x2="165.567" y2="76" stroke="#A4A7B0" stroke-width="8" stroke-linecap="round"/>
+                <line x1="184.017" y1="124" x2="4.56689" y2="124" stroke="#A4A7B0" stroke-width="8" stroke-linecap="round"/>
+                <line x1="312.848" y1="124" x2="208.017" y2="124" stroke="#A4A7B0" stroke-width="8" stroke-linecap="round"/>
+                <line x1="386.574" y1="124" x2="336.848" y2="124" stroke="#A4A7B0" stroke-width="8" stroke-linecap="round"/>
+                <line x1="448.401" y1="124" x2="410.574" y2="124" stroke="#A4A7B0" stroke-width="8" stroke-linecap="round"/>
+                <line x1="126.633" y1="148" x2="4.56689" y2="148" stroke="#A4A7B0" stroke-width="8" stroke-linecap="round"/>
+                <line x1="401.133" y1="148" x2="150.633" y2="148" stroke="#A4A7B0" stroke-width="8" stroke-linecap="round"/>
+                <line x1="526.567" y1="148" x2="425.133" y2="148" stroke="#A4A7B0" stroke-width="8" stroke-linecap="round"/>
+                <line x1="179.457" y1="172" x2="4.56689" y2="172" stroke="#A4A7B0" stroke-width="8" stroke-linecap="round"/>
+                <line x1="329.569" y1="172" x2="203.457" y2="172" stroke="#A4A7B0" stroke-width="8" stroke-linecap="round"/>
+            </g>
+                <rect x="563" y="208" width="156" height="256" rx="16" fill="#A4A7B0" opacity="0.05"/>
+            <g opacity="0.2">
+                <line x1="682.214" y1="228" x2="583" y2="228" stroke="#656973" stroke-width="8" stroke-linecap="round"/>
+            </g>
+            <g opacity="0.2">
+                <line x1="638.472" y1="252" x2="583" y2="252" stroke="#A4A7B0" stroke-width="8" stroke-linecap="round"/>
+                <line x1="681.396" y1="252" x2="654.472" y2="252" stroke="#A4A7B0" stroke-width="8" stroke-linecap="round"/>
+            </g>
+            <g opacity="0.2">
+                <line x1="617.989" y1="276" x2="583" y2="276" stroke="#A4A7B0" stroke-width="8" stroke-linecap="round"/>
+                <line x1="699" y1="276" x2="633.989" y2="276" stroke="#A4A7B0" stroke-width="8" stroke-linecap="round"/>
+            </g>
+            <g opacity="0.2">
+                <line x1="603.168" y1="300" x2="583" y2="300" stroke="#A4A7B0" stroke-width="8" stroke-linecap="round"/>
+                <line x1="657.873" y1="300" x2="619.168" y2="300" stroke="#A4A7B0" stroke-width="8" stroke-linecap="round"/>
+            </g>
+            <g opacity="0.2">
+                <line x1="637" y1="324" x2="583" y2="324" stroke="#A4A7B0" stroke-width="8" stroke-linecap="round"/>
+                <line x1="688.836" y1="324" x2="653" y2="324" stroke="#A4A7B0" stroke-width="8" stroke-linecap="round"/>
+            </g>
+            <g opacity="0.2">
+                <line x1="657.474" y1="372" x2="583" y2="372" stroke="#656973" stroke-width="8" stroke-linecap="round"/>
+            </g>
+            <g opacity="0.2">
+                <line x1="633" y1="396" x2="583" y2="396" stroke="#A4A7B0" stroke-width="8" stroke-linecap="round"/>
+                <line x1="699" y1="396" x2="649" y2="396" stroke="#A4A7B0" stroke-width="8" stroke-linecap="round"/>
+            </g>
+            <g opacity="0.2">
+                <line x1="585.416" y1="420" x2="583" y2="420" stroke="#A4A7B0" stroke-width="8" stroke-linecap="round"/>
+                <line x1="621.731" y1="420" x2="601.416" y2="420" stroke="#A4A7B0" stroke-width="8" stroke-linecap="round"/>
+                <line x1="699" y1="420" x2="637.731" y2="420" stroke="#A4A7B0" stroke-width="8" stroke-linecap="round"/>
+            </g>
+            <g opacity="0.2">
+                <line x1="619.471" y1="444" x2="583" y2="444" stroke="#A4A7B0" stroke-width="8" stroke-linecap="round"/>
+                <line x1="658.186" y1="444" x2="635.471" y2="444" stroke="#A4A7B0" stroke-width="8" stroke-linecap="round"/>
+            </g>
+        </svg>
+    </body>
+    <script src="${context.linker.toAbsoluteURL(context.linker.toPathInSite('~gitbook/embed/script.js'))}"></script>
+    <script>
+    window.GitBook('configure', {
+        suggestions: [
+            'Help me get started',
+            'What can I ask you?',
+            'Show me tips and tricks',
+        ],
+    });
+        window.GitBook('open');
+    </script>
+</html>
+`,
+        {
+            headers: {
+                'Content-Type': 'text/html',
+                'Cache-Control': 'no-cache, no-store, must-revalidate',
+            },
+        }
+    );
+}

packages/gitbook/src/app/sites/static/[mode]/[siteURL]/[siteData]/~gitbook/embed/layout.tsx

@@ -0,0 +1,40 @@
+import type { RouteLayoutParams } from '@/app/utils';
+import {
+    EmbeddableRootLayout,
+    generateEmbeddableMetadata,
+    generateEmbeddableViewport,
+} from '@/components/Embeddable';
+import { getEmbeddableStaticContext } from '@/lib/embeddable';
+import { shouldTrackEvents } from '@/lib/tracking';
+
+interface SiteStaticLayoutProps {
+    params: Promise<RouteLayoutParams>;
+}
+
+export default async function RootLayout({
+    params,
+    children,
+}: React.PropsWithChildren<SiteStaticLayoutProps>) {
+    const { context, visitorAuthClaims } = await getEmbeddableStaticContext(await params);
+    const withTracking = shouldTrackEvents();
+
+    return (
+        <EmbeddableRootLayout
+            context={context}
+            withTracking={withTracking}
+            visitorAuthClaims={visitorAuthClaims}
+        >
+            {children}
+        </EmbeddableRootLayout>
+    );
+}
+
+export async function generateViewport({ params }: SiteStaticLayoutProps) {
+    const { context } = await getEmbeddableStaticContext(await params);
+    return generateEmbeddableViewport({ context });
+}
+
+export async function generateMetadata({ params }: SiteStaticLayoutProps) {
+    const { context } = await getEmbeddableStaticContext(await params);
+    return generateEmbeddableMetadata({ context });
+}

packages/gitbook/src/app/sites/static/[mode]/[siteURL]/[siteData]/~gitbook/embed/page/[pagePath]/page.tsx

@@ -0,0 +1,25 @@
+import { type RouteParams, getPagePathFromParams } from '@/app/utils';
+import { EmbeddableDocsPage, generateEmbeddableDocsPageMetadata } from '@/components/Embeddable';
+import { getEmbeddableStaticContext } from '@/lib/embeddable';
+import type { Metadata } from 'next';
+
+export const dynamic = 'force-static';
+
+type PageProps = {
+    params: Promise<RouteParams>;
+};
+
+export default async function Page(props: PageProps) {
+    const params = await props.params;
+    const { context } = await getEmbeddableStaticContext(params);
+    const pathname = getPagePathFromParams(params);
+
+    return <EmbeddableDocsPage context={context} pageParams={{ pathname }} />;
+}
+
+export async function generateMetadata(props: PageProps): Promise<Metadata> {
+    const params = await props.params;
+    const { context } = await getEmbeddableStaticContext(params);
+    const pathname = getPagePathFromParams(params);
+    return generateEmbeddableDocsPageMetadata({ context, pageParams: { pathname } });
+}

packages/gitbook/src/app/sites/static/[mode]/[siteURL]/[siteData]/~gitbook/embed/script.js/route.ts

@@ -0,0 +1,77 @@
+import type { RouteLayoutParams } from '@/app/utils';
+import { getAssetURL } from '@/lib/assets';
+import { buildVersion } from '@/lib/build';
+import { getEmbeddableStaticContext } from '@/lib/embeddable';
+import type { CreateGitBookOptions } from '@gitbook/embed';
+import type { NextRequest } from 'next/server';
+
+export const dynamic = 'force-static';
+
+/**
+ * This route is used to serve the assistant.js script.
+ */
+export async function GET(
+    _request: NextRequest,
+    { params }: { params: Promise<RouteLayoutParams> }
+) {
+    const { context } = await getEmbeddableStaticContext(await params);
+    const initOptions: CreateGitBookOptions = {
+        siteURL: context.linker.toAbsoluteURL(context.linker.toPathInSite('')),
+    };
+
+    return new Response(
+        `
+(function () {
+  const w = window;
+  const gb = w.GitBook;
+  const initOptions = window.gitbookSettings || ${JSON.stringify(initOptions)};
+
+  if (typeof gb === "function") {
+    gb('init', initOptions);
+  } else {
+    var d = document;
+
+    var g = function () {
+      g.c(arguments);
+    };
+    g.q = [];
+    g.c = function (args) {
+      g.q.push(args);
+    };
+    w.GitBook = g;
+
+    g('init', initOptions);
+
+    const load = function () {
+      const style = document.createElement('link');
+      style.rel = 'stylesheet';
+      style.href = ${JSON.stringify(getAssetURL(`embed/index.css?v=${buildVersion()}`))};
+      document.head.appendChild(style);
+
+      const script = d.createElement('script');
+      script.type = 'text/javascript';
+      script.async = true;
+      script.src = ${JSON.stringify(getAssetURL(`embed/index.js?v=${buildVersion()}`))};
+
+      var latestScript = d.getElementsByTagName('script')[0];
+      latestScript.parentNode.insertBefore(script, latestScript);
+    };
+
+    if (document.readyState === 'complete') {
+      load();
+    } else if (w.attachEvent) {
+      w.attachEvent('onload', load);
+    } else {
+      w.addEventListener('load', load, false);
+    }
+  }
+})();
+        `,
+        {
+            headers: {
+                'Content-Type': 'application/javascript',
+                'Cache-Control': 'public, max-age=86400, stale-while-revalidate=604800',
+            },
+        }
+    );
+}

packages/gitbook/src/app/sites/static/[mode]/[siteURL]/[siteData]/~gitbook/mcp/route.ts

@@ -0,0 +1,92 @@
+import { type RouteLayoutParams, getStaticSiteContext } from '@/app/utils';
+import { throwIfDataError } from '@/lib/data';
+import { joinPathWithBaseURL } from '@/lib/paths';
+import { findSiteSpaceBy } from '@/lib/sites';
+import { createMcpHandler } from 'mcp-handler';
+import type { NextRequest } from 'next/server';
+import { z } from 'zod';
+
+async function handler(
+    nextRequest: NextRequest,
+    { params }: { params: Promise<RouteLayoutParams> }
+) {
+    const { context } = await getStaticSiteContext(await params);
+    const { dataFetcher, linker, site } = context;
+
+    const mcpHandler = createMcpHandler(
+        (server) => {
+            server.tool(
+                'searchDocumentation',
+                `Search across the documentation to find relevant information, code examples, API references, and guides. Use this tool when you need to answer questions about ${site.title}, find specific documentation, understand how features work, or locate implementation details. The search returns contextual content with titles and direct links to the documentation pages.`,
+                {
+                    query: z.string(),
+                },
+                async ({ query }) => {
+                    const results = await throwIfDataError(
+                        dataFetcher.searchSiteContent({
+                            organizationId: context.organizationId,
+                            siteId: site.id,
+                            query,
+                            scope: { mode: 'all' },
+                        })
+                    );
+
+                    return {
+                        content: results.flatMap((spaceResult) => {
+                            const found = findSiteSpaceBy(
+                                context.structure,
+                                (siteSpace) => siteSpace.space.id === spaceResult.id
+                            );
+                            const spaceURL = found?.siteSpace.urls.published;
+                            if (!spaceURL) {
+                                return [];
+                            }
+
+                            return spaceResult.pages.map((pageResult) => {
+                                const pageURL = linker.toAbsoluteURL(
+                                    linker.toLinkForContent(
+                                        joinPathWithBaseURL(spaceURL, pageResult.path)
+                                    )
+                                );
+
+                                const body = pageResult.sections
+                                    ?.map((section) => section.body)
+                                    .join('\n');
+
+                                return {
+                                    type: 'text',
+                                    text: [
+                                        `Title: ${pageResult.title}`,
+                                        `Link: ${pageURL}`,
+                                        body ? `Content: ${body}` : '',
+                                    ]
+                                        .filter(Boolean)
+                                        .join('\n'),
+                                };
+                            });
+                        }),
+                    };
+                }
+            );
+        },
+        {},
+        {
+            basePath: context.linker.toPathInSite('~gitbook/'),
+            streamableHttpEndpoint: '/mcp',
+            maxDuration: 60,
+            verboseLogs: true,
+            disableSse: true,
+        }
+    );
+
+    // Next.js request.url is the original URL and not the rewritten one from the middleware
+    const requestURL = new URL(
+        context.linker.toAbsoluteURL(context.linker.toPathInSite('~gitbook/mcp'))
+    );
+    requestURL.search = nextRequest.nextUrl.search;
+
+    const request = new Request(requestURL, nextRequest);
+    return mcpHandler(request);
+}
+
+export { handler as GET, handler as POST };

packages/gitbook/src/app/~gitbook/revalidate/route.ts

@@ -1,5 +1,6 @@
 import { type NextRequest, NextResponse } from 'next/server';
 
+import { getLogger } from '@/lib/logger';
 import { withVerifySignature } from '@/lib/routes';
 import { revalidateTag } from 'next/cache';
 
@@ -12,6 +13,7 @@ interface JsonBody {
  * The body should be a JSON with { tags: string[] }
  */
 export async function POST(req: NextRequest) {
+    const logger = getLogger().subLogger('revalidate');
     return withVerifySignature<JsonBody>(req, async (body) => {
         if (!body.tags || !Array.isArray(body.tags)) {
             return NextResponse.json(
@@ -23,8 +25,7 @@ export async function POST(req: NextRequest) {
         }
 
         body.tags.forEach((tag) => {
-            // biome-ignore lint/suspicious/noConsole: we want to log here
-            console.log(`Revalidating tag: ${tag}`);
+            logger.log(`Revalidating tag: ${tag}`);
             revalidateTag(tag);
         });
 

packages/gitbook/src/components/AI/index.ts

@@ -1 +1,3 @@
+export * from './useAI';
 export * from './useAIChat';
+export type { RenderAIMessageOptions } from './server-actions';

packages/gitbook/src/components/AI/server-actions/AIMessageView.tsx

@@ -1,4 +1,5 @@
 import type { GitBookSiteContext } from '@/lib/context';
+import { tcls } from '@/lib/tailwind';
 import type { AIMessage } from '@gitbook/api';
 import { DocumentView } from '../../DocumentView';
 import { AIToolCallsSummary } from './AIToolCallsSummary';
@@ -13,24 +14,31 @@ export function AIMessageView(
         context: GitBookSiteContext;
     }
 ) {
-    const { message, context, renderToolCalls = true } = props;
+    const { message, context, withToolCalls = true, withLinkPreviews = true } = props;
 
     return (
         <div className="flex flex-col gap-2">
             {message.steps.map((step, index) => {
                 return (
-                    <div key={index} className="flex animate-[fadeIn_500ms_both] flex-col gap-2">
+                    <div
+                        key={index}
+                        className={tcls(
+                            'flex animate-fade-in-slow flex-col gap-2',
+                            step.content.nodes.length > 0 ? 'has-content' : ''
+                        )}
+                    >
                         <DocumentView
                             document={step.content}
                             context={{
                                 mode: 'default',
                                 contentContext: context,
                                 wrapBlocksInSuspense: false,
-                                shouldRenderLinkPreviews: true,
+                                withLinkPreviews,
                             }}
-                            style={['space-y-4']}
+                            style="mt-2 space-y-4 empty:hidden"
                         />
-                        {renderToolCalls && step.toolCalls && step.toolCalls.length > 0 ? (
+
+                        {withToolCalls && step.toolCalls && step.toolCalls.length > 0 ? (
                             <AIToolCallsSummary toolCalls={step.toolCalls} context={context} />
                         ) : null}
                     </div>

packages/gitbook/src/components/AI/server-actions/AIToolCallsSummary.tsx

@@ -4,11 +4,13 @@ import { getSpaceLanguage } from '@/intl/server';
 import { t } from '@/intl/translate';
 import type { GitBookSiteContext } from '@/lib/context';
 import { resolveContentRef } from '@/lib/references';
+import { tcls } from '@/lib/tailwind';
 import type {
     AIToolCall,
     AIToolCallGetPageContent,
     AIToolCallGetPages,
     AIToolCallMCP,
+    AIToolCallOther,
     AIToolCallSearch,
     ContentRef,
 } from '@gitbook/api';
@@ -37,7 +39,7 @@ function ToolCallSummary(props: { toolCall: AIToolCall; context: GitBookSiteCont
     const { toolCall, context } = props;
 
     return (
-        <div className="flex items-start gap-2 text-sm text-tint-subtle">
+        <div className="flex origin-left animate-scale-in-slow items-start gap-2 text-sm text-tint-subtle">
             <Icon
                 icon={getIconForToolCall(toolCall)}
                 className="mt-1 size-3 shrink-0 text-tint-subtle/8"
@@ -57,6 +59,8 @@ function getDescriptionForToolCall(toolCall: AIToolCall, context: GitBookSiteCon
             return <DescriptionForGetPagesToolCall toolCall={toolCall} context={context} />;
         case 'mcp':
             return <DescriptionForMCPToolCall toolCall={toolCall} context={context} />;
+        case 'other':
+            return <DescriptionForOtherToolCall toolCall={toolCall} context={context} />;
         default:
             return <>{toolCall.tool}</>;
     }
@@ -68,7 +72,7 @@ function DescriptionForPageContentToolCall(props: {
 }) {
     const { toolCall, context } = props;
 
-    const language = getSpaceLanguage(context.customization);
+    const language = getSpaceLanguage(context);
 
     return (
         <p>
@@ -98,7 +102,7 @@ function DescriptionForMCPToolCall(props: {
 }) {
     const { toolCall, context } = props;
 
-    const language = getSpaceLanguage(context.customization);
+    const language = getSpaceLanguage(context);
 
     return (
         <p>
@@ -111,13 +115,22 @@ function DescriptionForMCPToolCall(props: {
     );
 }
 
+function DescriptionForOtherToolCall(props: {
+    toolCall: AIToolCallOther;
+    context: GitBookSiteContext;
+}) {
+    const { toolCall } = props;
+
+    return <p>{toolCall.summary.text}</p>;
+}
+
 async function DescriptionForSearchToolCall(props: {
     toolCall: AIToolCallSearch;
     context: GitBookSiteContext;
 }) {
     const { toolCall, context } = props;
 
-    const language = getSpaceLanguage(context.customization);
+    const language = getSpaceLanguage(context);
 
     // Resolve all hrefs for search results in parallel
     const searchResultsWithHrefs = await Promise.all(
@@ -144,69 +157,80 @@ async function DescriptionForSearchToolCall(props: {
         })
     );
 
+    const hasResults = toolCall.results.length > 0;
+
     return (
-        <details className="-ml-5 group flex w-full flex-col gap-2">
-            <summary className="-mx-2 -mt-2 flex cursor-pointer list-none items-center gap-2 rounded-corners:rounded-md py-2 pr-4 pl-7 transition-colors marker:hidden hover:bg-primary-hover">
-                <div className="flex flex-col">
+        <details className={tcls('-ml-5 group flex w-full flex-col', hasResults ? 'gap-2' : '')}>
+            <summary
+                className={tcls(
+                    '-mx-2 flex list-none items-center gap-2 circular-corners:rounded-2xl rounded-corners:rounded-md pr-4 pl-7 transition-colors marker:hidden',
+                    hasResults ? '-my-2 cursor-pointer py-2 hover:bg-primary-hover' : ''
+                )}
+            >
+                <div className="flex min-w-0 flex-col break-words leading-snug">
                     <p>{t(language, 'searched_for', <strong>{toolCall.query}</strong>)}</p>
-                    <p className="text-tint-subtle text-xs">
-                        {toolCall.results.length
+                    <p className="mt-0.5 text-tint-subtle text-xs">
+                        {hasResults
                             ? t(language, 'search_results_count', toolCall.results.length)
                             : t(language, 'search_no_results')}
                     </p>
                 </div>
-                <div className="ml-auto flex items-center gap-1">
-                    <span className="block group-open:hidden">{t(language, 'view')}</span>
-                    <span className="hidden group-open:block">{t(language, 'close')}</span>
-                    <Icon
-                        icon="chevron-right"
-                        className="size-3 shrink-0 transition-transform group-open:rotate-90"
-                    />
-                </div>
+                {hasResults ? (
+                    <div className="ml-auto flex items-center gap-1">
+                        <span className="block group-open:hidden">{t(language, 'view')}</span>
+                        <span className="hidden group-open:block">{t(language, 'close')}</span>
+                        <Icon
+                            icon="chevron-right"
+                            className="size-3 shrink-0 transition-transform group-open:rotate-90"
+                        />
+                    </div>
+                ) : null}
             </summary>
-            <div className="max-h-0 overflow-y-auto circular-corners:rounded-2xl rounded-corners:rounded-lg border border-tint-subtle p-2 opacity-0 transition-all duration-500 [transition-behavior:allow-discrete] group-open:max-h-96 group-open:opacity-11">
-                <ol className="space-y-1">
-                    {searchResultsWithHrefs.map((result, index) => (
-                        <li
-                            key={`${result.pageId}-${index}`}
-                            className="animate-fadeIn"
-                            style={{
-                                animationDelay: `${index * 25}ms`,
-                            }}
-                        >
-                            <Link
-                                href={result.href}
-                                className="flex items-start gap-2 circular-corners:rounded-2xl rounded-corners:rounded-md px-3 py-2 transition-colors hover:bg-primary-hover"
+            {hasResults ? (
+                <div className="hide-scrollbar mt-1 max-h-0 overflow-y-auto circular-corners:rounded-2xl rounded-corners:rounded-lg border border-tint-subtle p-2 opacity-0 transition-all transition-discrete duration-500 group-open:max-h-96 group-open:opacity-11">
+                    <ol className="space-y-1">
+                        {searchResultsWithHrefs.map((result, index) => (
+                            <li
+                                key={`${result.pageId}-${index}`}
+                                className="animate-fade-in-slow"
+                                style={{
+                                    animationDelay: `${index * 25}ms`,
+                                }}
                             >
-                                <Icon
-                                    icon="memo"
-                                    className="mt-1 size-3 shrink-0 text-tint-subtle"
-                                />
-                                <div className="flex flex-col gap-1 text-tint">
-                                    <h3 className="line-clamp-2 font-medium text-sm text-tint">
-                                        <HighlightQuery
-                                            query={toolCall.query}
-                                            text={result.title}
-                                        />
-                                    </h3>
-                                    {result.description && (
-                                        <p className="line-clamp-2 text-tint-subtle text-xs">
+                                <Link
+                                    href={result.href}
+                                    className="flex items-start gap-2 circular-corners:rounded-2xl rounded-corners:rounded-md px-3 py-2 transition-colors hover:bg-primary-hover"
+                                >
+                                    <Icon
+                                        icon="memo"
+                                        className="mt-1 size-3 shrink-0 text-tint-subtle"
+                                    />
+                                    <div className="flex flex-col gap-1 text-tint">
+                                        <h3 className="line-clamp-2 font-medium text-sm text-tint">
                                             <HighlightQuery
                                                 query={toolCall.query}
-                                                text={result.description}
+                                                text={result.title}
                                             />
-                                        </p>
-                                    )}
-                                </div>
-                                <Icon
-                                    icon="chevron-right"
-                                    className="ml-auto size-3 shrink-0 self-center"
-                                />
-                            </Link>
-                        </li>
-                    ))}
-                </ol>
-            </div>
+                                        </h3>
+                                        {result.description && (
+                                            <p className="line-clamp-2 text-tint-subtle text-xs">
+                                                <HighlightQuery
+                                                    query={toolCall.query}
+                                                    text={result.description}
+                                                />
+                                            </p>
+                                        )}
+                                    </div>
+                                    <Icon
+                                        icon="chevron-right"
+                                        className="ml-auto size-3 shrink-0 self-center"
+                                    />
+                                </Link>
+                            </li>
+                        ))}
+                    </ol>
+                </div>
+            ) : null}
         </details>
     );
 }
@@ -217,7 +241,7 @@ function DescriptionForGetPagesToolCall(props: {
 }) {
     const { toolCall, context } = props;
 
-    const language = getSpaceLanguage(context.customization);
+    const language = getSpaceLanguage(context);
 
     return (
         <p>
@@ -235,6 +259,8 @@ function getIconForToolCall(toolCall: AIToolCall): IconName {
             return 'magnifying-glass';
         case 'getPages':
             return 'files';
+        case 'other':
+            return (toolCall.summary.icon as IconName) ?? 'hammer';
         default:
             return 'hammer';
     }

packages/gitbook/src/components/AI/server-actions/api.tsx

@@ -1,6 +1,7 @@
 'use server';
 import type { GitBookBaseContext } from '@/lib/context';
 import { fetchServerActionSiteContext } from '@/lib/server-actions';
+import { traceErrorOnly } from '@/lib/tracing';
 import {
     type AIMessage,
     AIMessageRole,
@@ -19,97 +20,103 @@ export async function streamRenderAIMessage(
     rawStream: AsyncIterable<AIStreamResponse>,
     options?: RenderAIMessageOptions
 ) {
-    const message: AIMessage = {
-        id: '',
-        role: AIMessageRole.Assistant,
-        steps: [],
-    };
-
-    const updateProcessingMessageStep = (
-        stepIndex: number,
-        callback: (step: AIMessageStep) => void
-    ) => {
-        if (stepIndex > message.steps.length) {
-            throw new Error(
-                `Step index out of bounds ${stepIndex} (${message.steps.length} steps)`
-            );
-        }
-
-        if (message.steps[stepIndex]) {
-            message.steps = [...message.steps];
-            message.steps[stepIndex] = { ...message.steps[stepIndex] };
-            callback(message.steps[stepIndex]);
-        } else {
-            message.steps = [
-                ...message.steps,
-                {
-                    content: {
-                        object: 'document',
-                        data: {},
-                        nodes: [],
-                    },
-                },
-            ];
-            callback(message.steps[stepIndex]);
-        }
-    };
-
-    // Fetch the full-context in the background to avoid blocking the stream.
-    const promiseContext = fetchServerActionSiteContext(baseContext);
-
-    return parseResponse<{
-        content: React.ReactNode;
-        event: AIStreamResponse;
-    }>(rawStream, async (event) => {
-        switch (event.type) {
-            /**
-             * The agent is processing a tool call in a new message.
-             */
-            case 'response_tool_call': {
-                updateProcessingMessageStep(event.stepIndex, (step) => {
-                    step.toolCalls ??= [];
-                    step.toolCalls.push(event.toolCall);
-                });
-                break;
-            }
-
-            /**
-             * The agent is writing the content of a new message.
-             */
-            case 'response_reasoning':
-            case 'response_document': {
-                updateProcessingMessageStep(event.stepIndex, (step) => {
-                    const container = event.type === 'response_reasoning' ? 'reasoning' : 'content';
-
-                    step[container] ??= {
-                        object: 'document',
-                        data: {},
-                        nodes: [],
-                    };
-                    step[container] = {
-                        ...step[container],
-                        nodes: [...step[container].nodes],
-                    };
-                    if (event.operation === 'insert') {
-                        step[container].nodes.push(...event.blocks);
-                    } else {
-                        step[container].nodes.splice(
-                            -event.blocks.length,
-                            event.blocks.length,
-                            ...event.blocks
-                        );
-                    }
-                });
-                break;
-            }
-        }
-
-        return {
-            event,
-            content: (
-                <AIMessageView message={message} context={await promiseContext} {...options} />
-            ),
+    return traceErrorOnly('AI.streamRenderAIMessage', async () => {
+        const message: AIMessage = {
+            id: '',
+            role: AIMessageRole.Assistant,
+            steps: [],
         };
+
+        const updateProcessingMessageStep = (
+            stepIndex: number,
+            callback: (step: AIMessageStep) => void
+        ) => {
+            if (stepIndex > message.steps.length) {
+                throw new Error(
+                    `Step index out of bounds ${stepIndex} (${message.steps.length} steps)`
+                );
+            }
+
+            if (message.steps[stepIndex]) {
+                message.steps = [...message.steps];
+                // @ts-expect-error
+                message.steps[stepIndex] = { ...message.steps[stepIndex] };
+                // @ts-expect-error
+                callback(message.steps[stepIndex]);
+            } else {
+                message.steps = [
+                    ...message.steps,
+                    {
+                        content: {
+                            object: 'document',
+                            data: {},
+                            nodes: [],
+                        },
+                    },
+                ];
+                // @ts-expect-error
+                callback(message.steps[stepIndex]);
+            }
+        };
+
+        // Fetch the full-context in the background to avoid blocking the stream.
+        const promiseContext = fetchServerActionSiteContext(baseContext);
+
+        return parseResponse<{
+            content: React.ReactNode;
+            event: AIStreamResponse;
+        }>(rawStream, async (event) => {
+            switch (event.type) {
+                /**
+                 * The agent is processing a tool call in a new message.
+                 */
+                case 'response_tool_call': {
+                    updateProcessingMessageStep(event.stepIndex, (step) => {
+                        step.toolCalls ??= [];
+                        step.toolCalls.push(event.toolCall);
+                    });
+                    break;
+                }
+
+                /**
+                 * The agent is writing the content of a new message.
+                 */
+                case 'response_reasoning':
+                case 'response_document': {
+                    updateProcessingMessageStep(event.stepIndex, (step) => {
+                        const container =
+                            event.type === 'response_reasoning' ? 'reasoning' : 'content';
+
+                        step[container] ??= {
+                            object: 'document',
+                            data: {},
+                            nodes: [],
+                        };
+                        step[container] = {
+                            ...step[container],
+                            nodes: [...step[container].nodes],
+                        };
+                        if (event.operation === 'insert') {
+                            step[container].nodes.push(...event.blocks);
+                        } else {
+                            step[container].nodes.splice(
+                                -event.blocks.length,
+                                event.blocks.length,
+                                ...event.blocks
+                            );
+                        }
+                    });
+                    break;
+                }
+            }
+
+            return {
+                event,
+                content: (
+                    <AIMessageView message={message} context={await promiseContext} {...options} />
+                ),
+            };
+        });
     });
 }
 

packages/gitbook/src/components/AI/server-actions/chat.ts

@@ -1,7 +1,15 @@
 'use server';
+import { getEmbeddableLinker } from '@/lib/embeddable';
 import { getSiteURLDataFromMiddleware } from '@/lib/middleware';
 import { getServerActionBaseContext } from '@/lib/server-actions';
-import { type AIMessageContext, AIMessageRole, AIModel } from '@gitbook/api';
+import { traceErrorOnly } from '@/lib/tracing';
+import {
+    type AIMessageContext,
+    AIMessageRole,
+    AIModel,
+    type AIToolCallResult,
+    type AIToolDefinition,
+} from '@gitbook/api';
 import { streamRenderAIMessage } from './api';
 import type { RenderAIMessageOptions } from './types';
 
@@ -12,32 +20,48 @@ export async function* streamAIChatResponse({
     message,
     messageContext,
     previousResponseId,
+    toolCall,
+    tools,
     options,
 }: {
-    message: string;
+    message?: string;
     messageContext: AIMessageContext;
     previousResponseId?: string;
+    toolCall?: AIToolCallResult;
+    tools?: AIToolDefinition[];
     options?: RenderAIMessageOptions;
 }) {
-    const context = await getServerActionBaseContext();
-    const siteURLData = await getSiteURLDataFromMiddleware();
+    const { stream } = await traceErrorOnly('AI.streamAIChatResponse', async () => {
+        let context = await getServerActionBaseContext();
+        if (options?.asEmbeddable) {
+            context = { ...context, linker: getEmbeddableLinker(context.linker) };
+        }
 
-    const api = await context.dataFetcher.api();
-    const rawStream = api.orgs.streamAiResponseInSite(siteURLData.organization, siteURLData.site, {
-        mode: 'assistant',
-        input: [
+        const siteURLData = await getSiteURLDataFromMiddleware();
+
+        const api = await context.dataFetcher.api();
+        const rawStream = api.orgs.streamAiResponseInSite(
+            siteURLData.organization,
+            siteURLData.site,
             {
-                role: AIMessageRole.User,
-                content: message,
-                context: messageContext,
-            },
-        ],
-        output: { type: 'document' },
-        model: AIModel.ReasoningLow,
-        previousResponseId,
-    });
+                input: message
+                    ? [
+                          {
+                              role: AIMessageRole.User,
+                              content: message,
+                              context: messageContext,
+                          },
+                      ]
+                    : [],
+                model: AIModel.ReasoningLow,
+                previousResponseId,
+                toolCall,
+                tools,
+            }
+        );
 
-    const { stream } = await streamRenderAIMessage(context, rawStream, options);
+        return await streamRenderAIMessage(context, rawStream, options);
+    });
 
     for await (const output of stream) {
         yield output;

packages/gitbook/src/components/AI/server-actions/index.ts

@@ -1,3 +1,2 @@
 export * from './types';
-export * from './responses';
 export * from './chat';