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2 years ago
/**
* Copyright (c) 2015-present, Facebook, Inc.
*
* This source code is licensed under the MIT license found in the
* LICENSE file in the root directory of this source tree.
*/
'use strict';
const crypto = require('crypto');
const macroCheck = new RegExp('[./]macro');
module.exports = function () {
return {
// This function transforms the Babel configuration on a per-file basis
config(config, { source }) {
// Babel Macros are notoriously hard to cache, so they shouldn't be
// https://github.com/babel/babel/issues/8497
// We naively detect macros using their package suffix and add a random token
// to the caller, a valid option accepted by Babel, to compose a one-time
// cacheIdentifier for the file. We cannot tune the loader options on a per
// file basis.
if (macroCheck.test(source)) {
return Object.assign({}, config.options, {
caller: Object.assign({}, config.options.caller, {
craInvalidationToken: crypto.randomBytes(32).toString('hex'),
}),
});
}
return config.options;
},
};
};