react-native/local-cli/link/android/patches/applyPatch.js

/**
 * 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.
 *
 * @format
 */

const fs = require('fs');

module.exports = function applyPatch(file, patch) {
  fs.writeFileSync(
    file,
    fs
      .readFileSync(file, 'utf8')
      .replace(patch.pattern, match => `${match}${patch.patch}`),
  );
};