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8cbc16f0fa
* Unify the way we fork modules * Replace rollup-plugin-alias with our own plugin This does exactly what we need and doesn't suffer from https://github.com/rollup/rollup-plugin-alias/issues/34. * Move the new plugin to its own file * Rename variable for consistency I settled on calling them "forks" since we already have a different concept of "shims". * Move fork config into its own file
50 lines
1.4 KiB
JavaScript
50 lines
1.4 KiB
JavaScript
/**
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* Copyright (c) 2013-present, Facebook, Inc.
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*
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* This source code is licensed under the MIT license found in the
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* LICENSE file in the root directory of this source tree.
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*/
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'use strict';
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const path = require('path');
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let resolveCache = new Map();
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function useForks(forks) {
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let resolvedForks = {};
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Object.keys(forks).forEach(srcModule => {
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const targetModule = forks[srcModule];
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resolvedForks[require.resolve(srcModule)] = require.resolve(targetModule);
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});
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return {
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resolveId(importee, importer) {
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if (!importer || !importee) {
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return null;
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}
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let resolvedImportee = null;
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let cacheKey = `${importer}:::${importee}`;
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if (resolveCache.has(cacheKey)) {
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// Avoid hitting file system if possible.
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resolvedImportee = resolveCache.get(cacheKey);
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} else {
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try {
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resolvedImportee = require.resolve(importee, {
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paths: [path.dirname(importer)],
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});
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} catch (err) {
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// Not our fault, let Rollup fail later.
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}
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if (resolvedImportee) {
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resolveCache.set(cacheKey, resolvedImportee);
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}
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}
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if (resolvedImportee && resolvedForks.hasOwnProperty(resolvedImportee)) {
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// We found a fork!
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return resolvedForks[resolvedImportee];
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}
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return null;
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},
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};
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}
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module.exports = useForks;
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