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react-scripts

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if (typeof Promise === 'undefined') { // Rejection tracking prevents a common issue where React gets into an // inconsistent state due to an error, but it gets swallowed by a Promise, // and the user has no idea what causes React's erratic future behavior. require('promise/lib/rejection-tracking').enable(); window.Promise = require('promise/lib/es6-extensions.js'); } require('whatwg-fetch');