unpkg/config/polyfills.js

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"use strict"
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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.
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require("promise/lib/rejection-tracking").enable()
window.Promise = require("promise/lib/es6-extensions.js")
}
// fetch() polyfill for making API calls.
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require("whatwg-fetch")
// Object.assign() is commonly used with React.
// It will use the native implementation if it's present and isn't buggy.
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Object.assign = require("object-assign")