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`process.getBuiltinModule(id)` provides a way to load built-in modules
in a globally available function. ES Modules that need to support
other environments can use it to conditionally load a Node.js built-in
when it is run in Node.js, without having to deal with the resolution
error that can be thrown by `import` in a non-Node.js environment or
having to use dynamic `import()` which either turns the module into an
asynchronous module, or turns a synchronous API into an asynchronous
one.
```mjs
if (globalThis.process.getBuiltinModule) {
// Run in Node.js, use the Node.js fs module.
const fs = globalThis.process.getBuiltinModule('fs');
// If `require()` is needed to load user-modules, use
// createRequire()
const module = globalThis.process.getBuiltinModule('module');
const require = module.createRequire(import.meta.url);
const foo = require('foo');
}
```
If `id` specifies a built-in module available in the current Node.js
process, `process.getBuiltinModule(id)` method returns the
corresponding built-in module. If `id` does not correspond to any
built-in module, `undefined` is returned.
`process.getBuiltinModule(id)` accept built-in module IDs that are
recognized by `module.isBuiltin(id)`. Some built-in modules must be
loaded with the `node:` prefix.
The built-in modules returned by `process.getBuiltinModule(id)` are
always the original modules - that is, it's not affected by
`require.cache`.
PR-URL: https://github.com/nodejs/node/pull/52762
Fixes: https://github.com/nodejs/node/issues/52599
Reviewed-By: Matteo Collina <matteo.collina@gmail.com>
Reviewed-By: Moshe Atlow <moshe@atlow.co.il>
Reviewed-By: Stephen Belanger <admin@stephenbelanger.com>
Reviewed-By: James M Snell <jasnell@gmail.com>
Reviewed-By: Chengzhong Wu <legendecas@gmail.com>
Reviewed-By: Rafael Gonzaga <rafael.nunu@hotmail.com>
Reviewed-By: Marco Ippolito <marcoippolito54@gmail.com>
Reviewed-By: Michaël Zasso <targos@protonmail.com>
Reviewed-By: Zijian Liu <lxxyxzj@gmail.com>
Reviewed-By: Geoffrey Booth <webadmin@geoffreybooth.com>
Reviewed-By: Mohammed Keyvanzadeh <mohammadkeyvanzade94@gmail.com>
56 lines
2.0 KiB
JavaScript
56 lines
2.0 KiB
JavaScript
import { isMainThread, hasCrypto, hasIntl } from '../common/index.mjs';
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import assert from 'node:assert';
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import { builtinModules } from 'node:module';
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for (const invalid of [1, undefined, null, false, [], {}, () => {}, Symbol('test')]) {
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assert.throws(() => process.getBuiltinModule(invalid), { code: 'ERR_INVALID_ARG_TYPE' });
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}
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for (const invalid of [
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'invalid', 'test', 'sea', 'test/reporter', 'internal/bootstrap/realm',
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'internal/deps/undici/undici', 'internal/util',
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]) {
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assert.strictEqual(process.getBuiltinModule(invalid), undefined);
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}
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// Check that createRequire()(id) returns the same thing as process.getBuiltinModule(id).
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const require = process.getBuiltinModule('module').createRequire(import.meta.url);
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const publicBuiltins = new Set(builtinModules);
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// Remove built-ins not available in the current setup.
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if (!isMainThread) {
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publicBuiltins.delete('trace_events');
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}
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if (!hasCrypto) {
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publicBuiltins.delete('crypto');
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publicBuiltins.delete('tls');
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publicBuiltins.delete('_tls_common');
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publicBuiltins.delete('_tls_wrap');
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publicBuiltins.delete('http2');
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publicBuiltins.delete('https');
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publicBuiltins.delete('inspector');
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publicBuiltins.delete('inspector/promises');
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}
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if (!hasIntl) {
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publicBuiltins.delete('inspector');
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publicBuiltins.delete('trace_events');
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}
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for (const id of publicBuiltins) {
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assert.strictEqual(process.getBuiltinModule(id), require(id));
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}
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// Check that import(id).default returns the same thing as process.getBuiltinModule(id).
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for (const id of publicBuiltins) {
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const imported = await import(`node:${id}`);
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assert.strictEqual(process.getBuiltinModule(id), imported.default);
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}
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// publicBuiltins does not include 'test' which requires the node: prefix.
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const ids = publicBuiltins.add('test');
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// Check that import(id).default returns the same thing as process.getBuiltinModule(id).
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for (const id of ids) {
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const prefixed = `node:${id}`;
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const imported = await import(prefixed);
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assert.strictEqual(process.getBuiltinModule(prefixed), imported.default);
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}
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