Add a new packages @gitbook/colors (#2854)

Co-authored-by: Zeno Kapitein <zenomilan@me.com>

.changeset/breezy-seals-yell.md

@@ -0,0 +1,5 @@
+---
+'@gitbook/colors': minor
+---
+
+Initial release

bun.lock

@@ -22,6 +22,13 @@
         "wrangler": "3.82.0",
       },
     },
+    "packages/colors": {
+      "name": "@gitbook/colors",
+      "version": "0.1.0",
+      "devDependencies": {
+        "typescript": "^5.5.3",
+      },
+    },
     "packages/emoji-codepoints": {
       "name": "@gitbook/emoji-codepoints",
       "version": "0.2.0",
@@ -35,6 +42,7 @@
       "dependencies": {
         "@gitbook/api": "^0.93.0",
         "@gitbook/cache-do": "workspace:*",
+        "@gitbook/colors": "workspace:*",
         "@gitbook/emoji-codepoints": "workspace:*",
         "@gitbook/icons": "workspace:*",
         "@gitbook/openapi-parser": "workspace:*",
@@ -594,6 +602,8 @@
 
     "@gitbook/cache-do": ["@gitbook/cache-do@workspace:packages/cache-do"],
 
+    "@gitbook/colors": ["@gitbook/colors@workspace:packages/colors"],
+
     "@gitbook/emoji-codepoints": ["@gitbook/emoji-codepoints@workspace:packages/emoji-codepoints"],
 
     "@gitbook/fontawesome-pro": ["@gitbook/fontawesome-pro@1.0.8", "", { "dependencies": { "@fortawesome/fontawesome-common-types": "^6.6.0" } }, "sha512-i4PgiuGyUb52Muhc52kK3aMJIMfMkA2RbPW30tre8a6M8T6mWTfYo6gafSgjNvF1vH29zcuB8oBYnF0gO4XcHA=="],

packages/colors/.gitignore

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

packages/colors/README.md

@@ -0,0 +1,3 @@
+# `@gitbook/colors`
+
+A set of default colors and transformation functions used throughout the GitBook Open and app.

packages/colors/package.json

@@ -0,0 +1,26 @@
+{
+    "name": "@gitbook/colors",
+    "type": "module",
+    "exports": {
+        ".": {
+            "types": "./dist/index.d.ts",
+            "development": "./src/index.ts",
+            "default": "./dist/index.js"
+        }
+    },
+    "version": "0.1.0",
+    "devDependencies": {
+        "typescript": "^5.5.3"
+    },
+    "scripts": {
+        "build": "tsc",
+        "typecheck": "tsc --noEmit",
+        "dev": "tsc -w"
+    },
+    "files": [
+        "dist",
+        "src",
+        "README.md",
+        "CHANGELOG.md"
+    ]
+}

packages/colors/src/colors.ts

@@ -0,0 +1,39 @@
+/**
+ * Default primary color throughout the GitBook ecosystem.
+ */
+export const DEFAULT_PRIMARY_COLOR = '#346DDB';
+
+/**
+ * The darkest color that exists in GitBook, used as the relative minimum of every generated color scale.
+ */
+export const DARK_BASE = '#1D1D1D';
+
+/**
+ * The lightest color that exists in GitBook, used as the relative maximum of every generated color scale.
+ */
+export const LIGHT_BASE = '#FFFFFF';
+
+/**
+ * Used as the basis of all UI elements that are not colored by the primary color. Neutral gray by default, overridden by site customization.
+ */
+export const DEFAULT_TINT_COLOR = '#787878';
+
+/**
+ * Used for informational messages and neutral alerts.
+ */
+export const DEFAULT_HINT_INFO_COLOR = '#787878';
+
+/**
+ * Used for showing important information or non-critical warnings.
+ */
+export const DEFAULT_HINT_WARNING_COLOR = '#FE9A00';
+
+/**
+ * Used for destructive actions or raising attention to critical information.
+ */
+export const DEFAULT_HINT_DANGER_COLOR = '#FB2C36';
+
+/**
+ * Used for showing positive actions or achievements.
+ */
+export const DEFAULT_HINT_SUCCESS_COLOR = '#00C950';

packages/colors/src/index.ts

@@ -0,0 +1,2 @@
+export * from './colors';
+export * from './transformations';

packages/colors/src/transformations.ts

@@ -1,3 +1,5 @@
+import { DARK_BASE, LIGHT_BASE, DEFAULT_TINT_COLOR } from './colors';
+
 type ColorShades = {
     [key: string]: string;
 };
@@ -6,9 +8,6 @@ type RGBColor = [number, number, number];
 type OKLABColor = { L: number; A: number; B: number };
 type OKLCHColor = { L: number; C: number; H: number };
 
-export const DARK_BASE = '#1d1d1d';
-export const LIGHT_BASE = '#ffffff';
-export const DEFAULT_TINT_COLOR = '#787878';
 const D65 = [95.047, 100.0, 108.883]; // Reference white (D65)
 
 export enum ColorCategory {
@@ -226,7 +225,7 @@ export function colorScale(
 /**
  * Convert a hex color to an RGB color set.
  */
-function hexToRgbArray(hex: string): RGBColor {
+export function hexToRgbArray(hex: string): RGBColor {
     const originalHex = hex;
 
     let value = hex.replace('#', '');
@@ -252,7 +251,7 @@ function hexToRgbArray(hex: string): RGBColor {
 /**
  * Convert a RGB color set to a hex color.
  */
-function rgbArrayToHex(rgb: RGBColor): string {
+export function rgbArrayToHex(rgb: RGBColor): string {
     return `#${rgb
         .map((channel) => {
             const component = channel.toString(16);
@@ -262,7 +261,7 @@ function rgbArrayToHex(rgb: RGBColor): string {
         .join('')}`;
 }
 
-function getColor(percentage: number, start: RGBColor, end: RGBColor) {
+export function getColor(percentage: number, start: RGBColor, end: RGBColor) {
     const rgb = end.map((channel, index) => {
         return Math.round(channel + percentage * (start[index] - channel));
     });
@@ -271,21 +270,21 @@ function getColor(percentage: number, start: RGBColor, end: RGBColor) {
 }
 
 // Utility constants and helper functions
-function rgbToLinear(rgb: RGBColor): [number, number, number] {
+export function rgbToLinear(rgb: RGBColor): [number, number, number] {
     return rgb.map((v) => {
         const scaled = v / 255;
         return scaled <= 0.04045 ? scaled / 12.92 : ((scaled + 0.055) / 1.055) ** 2.4;
     }) as [number, number, number];
 }
 
-function linearToRgb(linear: [number, number, number]): RGBColor {
+export function linearToRgb(linear: [number, number, number]): RGBColor {
     return linear.map((v) => {
         const scaled = v <= 0.0031308 ? 12.92 * v : 1.055 * v ** (1 / 2.4) - 0.055;
         return Math.round(Math.max(0, Math.min(1, scaled)) * 255);
     }) as RGBColor;
 }
 
-function rgbToOklab(rgb: RGBColor): OKLABColor {
+export function rgbToOklab(rgb: RGBColor): OKLABColor {
     const [r, g, b] = rgbToLinear(rgb);
 
     const l = 0.4122214708 * r + 0.5363325363 * g + 0.0514459929 * b;
@@ -303,7 +302,7 @@ function rgbToOklab(rgb: RGBColor): OKLABColor {
     };
 }
 
-function oklabToRgb(oklab: OKLABColor): RGBColor {
+export function oklabToRgb(oklab: OKLABColor): RGBColor {
     const { L, A, B } = oklab;
 
     const lRoot = L + 0.3963377774 * A + 0.2158037573 * B;
@@ -321,14 +320,14 @@ function oklabToRgb(oklab: OKLABColor): RGBColor {
     return linearToRgb([r, g, b]);
 }
 
-function oklabToOklch(oklab: OKLABColor): OKLCHColor {
+export function oklabToOklch(oklab: OKLABColor): OKLCHColor {
     const { L, A, B } = oklab;
     const C = Math.sqrt(A ** 2 + B ** 2);
     const H = (Math.atan2(B, A) * 180) / Math.PI;
     return { L, C, H: H < 0 ? H + 360 : H };
 }
 
-function oklchToOklab(oklch: OKLCHColor): OKLABColor {
+export function oklchToOklab(oklch: OKLCHColor): OKLABColor {
     const { L, C, H } = oklch;
     const rad = (H * Math.PI) / 180;
     return {
@@ -338,15 +337,15 @@ function oklchToOklab(oklch: OKLCHColor): OKLABColor {
     };
 }
 
-function rgbToOklch(rgb: RGBColor): OKLCHColor {
+export function rgbToOklch(rgb: RGBColor): OKLCHColor {
     return oklabToOklch(rgbToOklab(rgb));
 }
 
-function oklchToRgb(oklch: OKLCHColor): RGBColor {
+export function oklchToRgb(oklch: OKLCHColor): RGBColor {
     return oklabToRgb(oklchToOklab(oklch));
 }
 
-function rgbToXyz(rgb: RGBColor): [number, number, number] {
+export function rgbToXyz(rgb: RGBColor): [number, number, number] {
     const [r, g, b] = rgbToLinear(rgb);
     return [
         (r * 0.4124564 + g * 0.3575761 + b * 0.1804375) * 100,
@@ -355,7 +354,11 @@ function rgbToXyz(rgb: RGBColor): [number, number, number] {
     ];
 }
 
-function xyzToLab65(xyz: [number, number, number]): { L: number; A: number; B: number } {
+export function xyzToLab65(xyz: [number, number, number]): {
+    L: number;
+    A: number;
+    B: number;
+} {
     const [x, y, z] = xyz.map((v, i) => {
         const scaled = v / D65[i];
         return scaled > 0.008856 ? Math.cbrt(scaled) : 7.787 * scaled + 16 / 116;
@@ -368,7 +371,7 @@ function xyzToLab65(xyz: [number, number, number]): { L: number; A: number; B: n
     };
 }
 
-function rgbTolab65(rgb: RGBColor): { L: number; A: number; B: number } {
+export function rgbTolab65(rgb: RGBColor): { L: number; A: number; B: number } {
     return xyzToLab65(rgbToXyz(rgb));
 }
 
@@ -376,7 +379,7 @@ function rgbTolab65(rgb: RGBColor): { L: number; A: number; B: number } {
   Delta Phi Star perceptual lightness contrast by Andrew Somers:
   https://github.com/Myndex/deltaphistar 
 */
-const PHI = 0.5 + Math.sqrt(1.25);
+export const PHI = 0.5 + Math.sqrt(1.25);
 
 export function dpsContrast(a: RGBColor, b: RGBColor) {
     const dps = Math.abs(rgbTolab65(a).L ** PHI - rgbTolab65(b).L ** PHI);
@@ -387,7 +390,10 @@ export function dpsContrast(a: RGBColor, b: RGBColor) {
 export function colorContrast(background: string, foreground: string[] = [LIGHT_BASE, DARK_BASE]) {
     const bg = hexToRgbArray(background);
 
-    const best: { color?: RGBColor; contrast: number } = { color: undefined, contrast: 0 };
+    const best: { color?: RGBColor; contrast: number } = {
+        color: undefined,
+        contrast: 0,
+    };
     for (const color of foreground) {
         const c = hexToRgbArray(color);
 

packages/colors/tsconfig.json

@@ -0,0 +1,24 @@
+{
+    "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",
+        "incremental": true,
+        "types": [
+            "bun-types" // add Bun global
+        ]
+    },
+    "include": ["src/**/*.ts", "src/**/*.tsx"],
+    "exclude": ["node_modules"]
+}

packages/gitbook/package.json

@@ -19,6 +19,7 @@
     "dependencies": {
         "@gitbook/api": "^0.93.0",
         "@gitbook/cache-do": "workspace:*",
+        "@gitbook/colors": "workspace:*",
         "@gitbook/emoji-codepoints": "workspace:*",
         "@gitbook/icons": "workspace:*",
         "@gitbook/openapi-parser": "workspace:*",

packages/gitbook/src/app/middleware/(site)/(core)/~gitbook/ogimage/[pageId]/route.tsx

@@ -1,11 +1,11 @@
 import { CustomizationHeaderPreset } from '@gitbook/api';
+import { colorContrast } from '@gitbook/colors';
 import { redirect } from 'next/navigation';
 import { ImageResponse } from 'next/og';
 import { NextRequest } from 'next/server';
 import React from 'react';
 
 import { googleFontsMap } from '@/fonts';
-import { colorContrast } from '@/lib/colors';
 import { getAbsoluteHref } from '@/lib/links';
 import { filterOutNullable } from '@/lib/typescript';
 import { getContentTitle } from '@/lib/utils';

packages/gitbook/src/components/Ads/AdCoverRendering.tsx

@@ -1,7 +1,7 @@
 import { SiteInsightsAd } from '@gitbook/api';
+import { hexToRgba } from '@gitbook/colors';
 import * as React from 'react';
 
-import { hexToRgba } from '@/lib/colors';
 import { getResizedImageURL } from '@/lib/images';
 import { tcls } from '@/lib/tailwind';
 

packages/gitbook/src/components/RootLayout/CustomizationRootLayout.tsx

@@ -9,18 +9,18 @@ import {
     type CustomizationTint,
     type SiteCustomizationSettings,
 } from '@gitbook/api';
-import { IconsProvider, IconStyle } from '@gitbook/icons';
-
-import { fontNotoColorEmoji, fonts, ibmPlexMono } from '@/fonts';
-import { getSpaceLanguage } from '@/intl/server';
-import { getStaticFileURL } from '@/lib/assets';
 import {
     colorContrast,
     colorScale,
     type ColorScaleOptions,
     DEFAULT_TINT_COLOR,
     hexToRgb,
-} from '@/lib/colors';
+} from '@gitbook/colors';
+import { IconsProvider, IconStyle } from '@gitbook/icons';
+
+import { fontNotoColorEmoji, fonts, ibmPlexMono } from '@/fonts';
+import { getSpaceLanguage } from '@/intl/server';
+import { getStaticFileURL } from '@/lib/assets';
 import { tcls } from '@/lib/tailwind';
 
 import { ClientContexts } from './ClientContexts';

packages/gitbook/tailwind.config.ts

@@ -3,7 +3,7 @@ import typography from '@tailwindcss/typography';
 import type { Config } from 'tailwindcss';
 import plugin from 'tailwindcss/plugin';
 
-import { ColorCategory, hexToRgb, scale, shadesOfColor } from './src/lib/colors';
+import { ColorCategory, hexToRgb, scale, shadesOfColor } from '@gitbook/colors';
 
 export const shades = [50, 100, 200, 300, 400, 500, 600, 700, 800, 900];
 export const opacities = [0, 4, 8, 12, 16, 24, 40, 64, 72, 88, 96, 100];