| 1 | ;
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| 2 |
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| 3 | require('core-js/es6/map')
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| 4 | require('core-js/es6/set')
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| 5 | require('raf/polyfill')
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| 6 | require('babel-polyfill')
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| 7 |
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| 8 | if (typeof Promise === 'undefined') {
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| 9 | // Rejection tracking prevents a common issue where React gets into an
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| 10 | // inconsistent state due to an error, but it gets swallowed by a Promise,
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| 11 | // and the user has no idea what causes React's erratic future behavior.
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| 12 | require('promise/lib/rejection-tracking').enable();
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| 13 | window.Promise = require('promise/lib/es6-extensions.js');
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| 14 | }
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| 15 |
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| 16 | // fetch() polyfill for making API calls.
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| 17 | require('whatwg-fetch');
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| 18 |
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| 19 | // Object.assign() is commonly used with React.
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| 20 | // It will use the native implementation if it's present and isn't buggy.
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| 21 | Object.assign = require('object-assign');
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| 22 |
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| 23 | // In tests, polyfill requestAnimationFrame since jsdom doesn't provide it yet.
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| 24 | // We don't polyfill it in the browser--this is user's responsibility.
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| 25 | if (process.env.NODE_ENV === 'test') {
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| 26 | require('raf').polyfill(global);
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| 27 | }
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