/**

* Copyright (c) Meta Platforms, Inc. and affiliates.

*

* This source code is licensed under the MIT license found in the

* LICENSE file in the root directory of this source tree.

*/

import * as esbuild from 'esbuild';

import fs from 'fs';

import path from 'path';

import {fileURLToPath} from 'url';

const __dirname = path.dirname(fileURLToPath(import.meta.url));

const root = path.resolve(__dirname, '..');

const sandboxBase = path.resolve(

root,

'src/components/MDX/Sandpack/sandpack-rsc/sandbox-code/src'

);

// 1. Bundle the server Worker runtime (React server build + RSDW/server.browser + Sucrase → IIFE)

// Minified because this runs inside a Web Worker (not parsed by Sandpack's Babel).

const workerOutfile = path.resolve(sandboxBase, 'worker-bundle.dist.js');

await esbuild.build({

entryPoints: [path.resolve(sandboxBase, 'rsc-server.js')],

bundle: true,

format: 'iife',

platform: 'browser',

conditions: ['react-server', 'browser'],

outfile: workerOutfile,

define: {'process.env.NODE_ENV': '"production"'},

minify: true,

});

// Post-process worker bundle:

// Prepend the webpack shim so __webpack_require__ (used by react-server-dom-webpack)

// is defined before the IIFE evaluates. The shim sets globalThis.__webpack_require__,

// which is accessible as a bare identifier since globalThis IS the Worker's global scope.

let workerCode = fs.readFileSync(workerOutfile, 'utf8');

const shimPath = path.resolve(sandboxBase, 'webpack-shim.js');

const shimCode = fs.readFileSync(shimPath, 'utf8');

workerCode = shimCode + '\n' + workerCode;

fs.writeFileSync(workerOutfile, workerCode);