39 lines
1.0 KiB
JavaScript
39 lines
1.0 KiB
JavaScript
/**
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* Copyright (c) 2015-present, Facebook, Inc.
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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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* @providesModule Number.es6
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* @polyfill
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* @nolint
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*/
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if (Number.EPSILON === undefined) {
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Object.defineProperty(Number, 'EPSILON', {
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value: Math.pow(2, -52),
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});
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}
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if (Number.MAX_SAFE_INTEGER === undefined) {
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Object.defineProperty(Number, 'MAX_SAFE_INTEGER', {
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value: Math.pow(2, 53) - 1,
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});
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}
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if (Number.MIN_SAFE_INTEGER === undefined) {
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Object.defineProperty(Number, 'MIN_SAFE_INTEGER', {
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value: -(Math.pow(2, 53) - 1),
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});
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}
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if (!Number.isNaN) {
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// https://github.com/dherman/tc39-codex-wiki/blob/master/data/es6/number/index.md#polyfill-for-numberisnan
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const globalIsNaN = global.isNaN;
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Object.defineProperty(Number, 'isNaN', {
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configurable: true,
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enumerable: false,
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value: function isNaN(value) {
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return typeof value === 'number' && globalIsNaN(value);
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},
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writable: true,
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});
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}
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