react-native/Libraries/polyfills/Number.es6.js

39 lines
1016 B
JavaScript

/**
* Copyright (c) Facebook, Inc. and its affiliates.
*
* This source code is licensed under the MIT license found in the
* LICENSE file in the root directory of this source tree.
*
* @format
* @polyfill
* @nolint
*/
if (Number.EPSILON === undefined) {
Object.defineProperty(Number, 'EPSILON', {
value: Math.pow(2, -52),
});
}
if (Number.MAX_SAFE_INTEGER === undefined) {
Object.defineProperty(Number, 'MAX_SAFE_INTEGER', {
value: Math.pow(2, 53) - 1,
});
}
if (Number.MIN_SAFE_INTEGER === undefined) {
Object.defineProperty(Number, 'MIN_SAFE_INTEGER', {
value: -(Math.pow(2, 53) - 1),
});
}
if (!Number.isNaN) {
// https://github.com/dherman/tc39-codex-wiki/blob/master/data/es6/number/index.md#polyfill-for-numberisnan
const globalIsNaN = global.isNaN;
Object.defineProperty(Number, 'isNaN', {
configurable: true,
enumerable: false,
value: function isNaN(value) {
return typeof value === 'number' && globalIsNaN(value);
},
writable: true,
});
}