mirror of
https://github.com/angular/angular
synced 2026-05-24 09:28:37 +00:00
58 lines
2.3 KiB
JavaScript
58 lines
2.3 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.dev/license
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*/
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const explicitExtensionRe = /\.[mc]?js$/;
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const explicitJsExtensionRe = /\.js$/;
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const builtinNamespaceImportRe = /^node:/;
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/*
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* NodeJS resolver that enables the interop with the current Bazel setup.
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*
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* The loader will attempt resolution by replacing explicit extension with
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* their ESM variants. It also tries completing import specifiers in case no
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* extension of explicit file is specified.
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*
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* There are a few cases:
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*
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* * Relative imports without an extension. This happens because our
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* source files cannot use explicit `.mjs` extensions yet.
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* * Relative imports with an explicit extension to `.js`. This may
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* be generated by TypeScript as we have `.ts` source files.
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* * Local module imports. In NPM, extensions are not needed as the
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* `package.json` `exports` help resolving. In Bazel when dealing with
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* 1st-party packages- `package.json` is not consulted in resolution.
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* 1. The NPM artifacts differ from the source compilation output.
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* 2. It results in additional churn, having to put `package.json` into `bin`.
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*/
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export async function resolve(specifier, context, nextResolve) {
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const interopAttempts = [];
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if (explicitJsExtensionRe.test(specifier)) {
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interopAttempts.push(specifier.replace(explicitJsExtensionRe, '.mjs'));
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}
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// If there is no explicit extension and we are not dealing with a
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// builtin namespace module, attempt various subpaths to prioritize ESM.
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if (!explicitExtensionRe.test(specifier) && !builtinNamespaceImportRe.test(specifier)) {
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interopAttempts.push(`${specifier}.mjs`);
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interopAttempts.push(`${specifier}/index.mjs`);
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// Last attempts are normal `.js` extensions. These could still
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// be valid ESM when there is an type:module `package.json` file
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interopAttempts.push(`${specifier}.js`);
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interopAttempts.push(`${specifier}/index.js`);
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}
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for (const attempt of interopAttempts) {
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try {
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return await nextResolve(attempt, context);
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} catch {}
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}
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// Original specifier is attempted at the end because
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// we want to prioritize the ESM variants first.
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return await nextResolve(specifier, context);
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}
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