node/test/fixtures/es-modules/require-cjs.mjs

import { createRequire } from "node:module";
const require = createRequire(import.meta.url);
const exports = require('./required-cjs');
console.log(exports.hello);
export default exports;
module: support require()ing synchronous ESM graphs This patch adds `require()` support for synchronous ESM graphs under the flag `--experimental-require-module` This is based on the the following design aspect of ESM: - The resolution can be synchronous (up to the host) - The evaluation of a synchronous graph (without top-level await) is also synchronous, and, by the time the module graph is instantiated (before evaluation starts), this is is already known. If `--experimental-require-module` is enabled, and the ECMAScript module being loaded by `require()` meets the following requirements: - Explicitly marked as an ES module with a `"type": "module"` field in the closest package.json or a `.mjs` extension. - Fully synchronous (contains no top-level `await`). `require()` will load the requested module as an ES Module, and return the module name space object. In this case it is similar to dynamic `import()` but is run synchronously and returns the name space object directly. ```mjs // point.mjs export function distance(a, b) { return (b.x - a.x) 2 + (b.y - a.y) 2; } class Point { constructor(x, y) { this.x = x; this.y = y; } } export default Point; ``` ```cjs const required = require('./point.mjs'); // [Module: null prototype] { // default: [class Point], // distance: [Function: distance] // } console.log(required); (async () => { const imported = await import('./point.mjs'); console.log(imported === required); // true })(); ``` If the module being `require()`'d contains top-level `await`, or the module graph it `import`s contains top-level `await`, [`ERR_REQUIRE_ASYNC_MODULE`][] will be thrown. In this case, users should load the asynchronous module using `import()`. If `--experimental-print-required-tla` is enabled, instead of throwing `ERR_REQUIRE_ASYNC_MODULE` before evaluation, Node.js will evaluate the module, try to locate the top-level awaits, and print their location to help users fix them. PR-URL: https://github.com/nodejs/node/pull/51977 Reviewed-By: Chengzhong Wu <legendecas@gmail.com> Reviewed-By: Matteo Collina <matteo.collina@gmail.com> Reviewed-By: Guy Bedford <guybedford@gmail.com> Reviewed-By: Antoine du Hamel <duhamelantoine1995@gmail.com> Reviewed-By: Geoffrey Booth <webadmin@geoffreybooth.com> 2024-03-11 17:50:24 +00:00			`import { createRequire } from "node:module";`
			`const require = createRequire(import.meta.url);`
			`const exports = require('./required-cjs');`
			`console.log(exports.hello);`
			`export default exports;`