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Filename : getPlatformExtension.js

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'use strict';

Object.defineProperty(exports, '__esModule', {
  value: true
});
exports.default = getPlatformExtension;

/**
 * Copyright (c) Facebook, Inc. and its affiliates. All Rights Reserved.
 *
 * This source code is licensed under the MIT license found in the
 * LICENSE file in the root directory of this source tree.
 */
const SUPPORTED_PLATFORM_EXTS = new Set(['android', 'ios', 'native', 'web']); // Extract platform extension: index.ios.js -> ios

function getPlatformExtension(file, platforms) {
  const last = file.lastIndexOf('.');
  const secondToLast = file.lastIndexOf('.', last - 1);

  if (secondToLast === -1) {
    return null;
  }

  const platform = file.substring(secondToLast + 1, last); // If an overriding platform array is passed, check that first

  if (platforms && platforms.indexOf(platform) !== -1) {
    return platform;
  }

  return SUPPORTED_PLATFORM_EXTS.has(platform) ? platform : null;
}