'use strict';
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Object.defineProperty(exports, '__esModule', {
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value: true
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});
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exports.default = getPlatformExtension;
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/**
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* Copyright (c) Facebook, Inc. and its affiliates. All Rights Reserved.
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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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const SUPPORTED_PLATFORM_EXTS = new Set(['android', 'ios', 'native', 'web']); // Extract platform extension: index.ios.js -> ios
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function getPlatformExtension(file, platforms) {
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const last = file.lastIndexOf('.');
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const secondToLast = file.lastIndexOf('.', last - 1);
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if (secondToLast === -1) {
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return null;
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}
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const platform = file.substring(secondToLast + 1, last); // If an overriding platform array is passed, check that first
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if (platforms && platforms.indexOf(platform) !== -1) {
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return platform;
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}
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return SUPPORTED_PLATFORM_EXTS.has(platform) ? platform : null;
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}
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