34 lines
1.1 KiB
JavaScript
34 lines
1.1 KiB
JavaScript
/**
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* Copyright (c) 2015-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 crypto = require('crypto');
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const macroCheck = new RegExp('[./]macro');
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module.exports = function () {
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return {
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// This function transforms the Babel configuration on a per-file basis
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config(config, { source }) {
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// Babel Macros are notoriously hard to cache, so they shouldn't be
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// https://github.com/babel/babel/issues/8497
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// We naively detect macros using their package suffix and add a random token
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// to the caller, a valid option accepted by Babel, to compose a one-time
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// cacheIdentifier for the file. We cannot tune the loader options on a per
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// file basis.
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if (macroCheck.test(source)) {
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return Object.assign({}, config.options, {
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caller: Object.assign({}, config.options.caller, {
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craInvalidationToken: crypto.randomBytes(32).toString('hex'),
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}),
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});
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}
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return config.options;
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},
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};
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};
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