mirror of
https://github.com/facebook/react-native.git
synced 2025-11-01 09:14:26 +00:00
Kevin Gozali
a89e9323fc
Summary: For better perf with TurboModule, cache the return value of NativePlatformConstants*.getConstants() in JS so that we avoid going back into native (from JS) for each call. This specific method is called very frequently throughout RN codebase. Reviewed By: mdvacca Differential Revision: D15893289 fbshipit-source-id: ce8016ed7d3efb420df93e27dbfa77d7d4f06cf8
46 lines
997 B
JavaScript
46 lines
997 B
JavaScript
/**
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* Copyright (c) Facebook, Inc. and its affiliates.
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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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* @format
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* @flow
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*/
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'use strict';
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import NativePlatformConstantsAndroid from './NativePlatformConstantsAndroid';
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export type PlatformSelectSpec<A, D> = {
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android?: A,
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default?: D,
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};
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const Platform = {
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__constants: null,
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OS: 'android',
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get Version() {
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return this.constants.Version;
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},
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get constants() {
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if (this.__constants == null) {
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this.__constants = NativePlatformConstantsAndroid.getConstants();
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}
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return this.__constants;
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},
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get isTesting(): boolean {
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if (__DEV__) {
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return this.constants.isTesting;
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}
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return false;
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},
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get isTV(): boolean {
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return this.constants.uiMode === 'tv';
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},
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select: <A, D>(spec: PlatformSelectSpec<A, D>): A | D =>
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'android' in spec ? spec.android : spec.default,
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};
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module.exports = Platform;
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