gitbook/packages/gitbook-v2/openNext/customWorkers/script/updateWrangler.ts

// In this script, we use the args from the cli to update the PREVIEW_URL vars in the wrangler config file for the middleware
import fs from 'node:fs';
import path from 'node:path';

const wranglerConfigPath = path.join(__dirname, '../middlewareWrangler.jsonc');

const file = fs.readFileSync(wranglerConfigPath, 'utf-8');

const args = process.argv.slice(2);
// The versionId is in the format xxx-xxx-xxx-xxx, we need the first part to reconstruct the preview URL
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`;

let updatedFile = file.replace(
    /"PREVIEW_HOSTNAME": "TO_REPLACE"/,
    `"PREVIEW_HOSTNAME": "${previewHostname}"`
);

updatedFile = updatedFile.replaceAll(
    /"WORKER_VERSION_ID": "TO_REPLACE"/g,
    `"WORKER_VERSION_ID": "${versionId}"`
);

fs.writeFileSync(wranglerConfigPath, updatedFile);