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https://github.com/angular/angular
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9cd89569f5
Replaces the existing ESM loader for dealing with external module imports. This loader was introduced by Aspect for AIO `.mjs` scripts. The loader will be used as foundation for a more extensive loader that also properly handles first-party packages. Additionally another loader is added, all packed as a single loader because our current NodeJS version only supports a single loader per node invocation. So we implement chaining ourselves. The new loader will attempt rewriting `.js` extensions to `.mjs`, also it will add `.mjs` if not already done. This is necessary in the transition phase because we don't/cannot use explicit `.mts` extensions and also we don't specify extensions in imports yet. Long-term we would likely use `.mts` and explicit import extensions, but it's not yet clear how we would sync this into g3 too. PR Close #48521
39 lines
1.3 KiB
JavaScript
39 lines
1.3 KiB
JavaScript
/**
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* @license
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* Copyright Google LLC All Rights Reserved.
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*
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* Use of this source code is governed by an MIT-style license that can be
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* found in the LICENSE file at https://angular.io/license
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*/
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import {extname} from 'path';
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import {fileURLToPath} from 'url';
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import * as extensionLoader from './esm-extension-loader.mjs';
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import * as nodeModuleLoader from './esm-node-module-loader.mjs';
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const loaders = [extensionLoader, nodeModuleLoader];
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export async function resolve(initialSpecifier, initialCtx, defaultResolve) {
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let nextFn = (i) => (s, c) => {
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if (i === loaders.length) {
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return defaultResolve(s, c, defaultResolve);
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}
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return loaders[i].resolve(s, c, nextFn(i + 1));
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};
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return nextFn(0)(initialSpecifier, initialCtx);
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}
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export async function load(url, context, defaultLoad) {
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// Using `--loader` causes non-ESM extension-less files like
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// for `typescript/bin/tsc` to be considered as ESM. This is a bug
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// via: https://github.com/nodejs/node/issues/33226.
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// Workaround is to load such extension-less files as CommonJS. Similar
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// to how they are loaded without `--loader` being specified.
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if (url.startsWith('file://') && extname(fileURLToPath(url)) === '') {
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context.format = 'commonjs';
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}
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return defaultLoad(url, context, defaultLoad);
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}
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