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Move `Number` polyfills into the `/polyfills/` directory 

Reviewed By: vjeux

Differential Revision: D3223317

fb-gh-sync-id: a49a14f217b27d6542b65c4780c557e73da2443f
fbshipit-source-id: a49a14f217b27d6542b65c4780c557e73da2443f
This commit is contained in:
Steven Luscher 2016-04-26 11:23:47 -07:00 committed by Facebook Github Bot 6
parent ca409964fc
commit d07a52d887
2 changed files with 49 additions and 0 deletions
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15
react-packager/src/Resolver/polyfills/Number.es6.js
View File

@ -10,6 +10,21 @@
* @polyfill
*/
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;

34
react-packager/src/Resolver/polyfills/__tests__/Number.es6.js → react-packager/src/Resolver/polyfills/__tests__/Number.es6-test.js
View File

@ -12,6 +12,40 @@
jest.autoMockOff();
describe('Number (ES6)', () => {
describe('EPSILON', () => {
beforeEach(() => {
delete Number.EPSILON;
jest.resetModuleRegistry();
require('../Number.es6');
});
it('is 2^(-52)', () => {
expect(Number.EPSILON).toBe(Math.pow(2, -52));
});
it('can be used to test equality', () => {
// https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Number/EPSILON#Testing_equality
expect(Number.EPSILON).toBeGreaterThan(Math.abs(0.2 - 0.3 + 0.1));
});
});
describe('MAX_SAFE_INTEGER', () => {
beforeEach(() => {
delete Number.MAX_SAFE_INTEGER;
jest.resetModuleRegistry();
require('../Number.es6');
});
it('is 2^53 - 1', () => {
expect(Number.MAX_SAFE_INTEGER).toBe(Math.pow(2, 53) - 1);
});
});
describe('MIN_SAFE_INTEGER', () => {
beforeEach(() => {
delete Number.MIN_SAFE_INTEGER;
jest.resetModuleRegistry();
require('../Number.es6');
});
it('is -(2^53 - 1)', () => {
expect(Number.MIN_SAFE_INTEGER).toBe(-(Math.pow(2, 53) - 1));
});
});
describe('isNaN()', () => {
// https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Number/isNaN#Examples
beforeEach(() => {