sourcecred/config/polyfills.js

// @no-flow
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");
}

// fetch() polyfill for making API calls.
require("whatwg-fetch");

// Object.assign() is commonly used with React.
// It will use the native implementation if it's present and isn't buggy.
Object.assign = require("object-assign");

// In tests, polyfill requestAnimationFrame since jsdom doesn't provide it yet.
// We don't polyfill it in the browser--this is user's responsibility.
if (process.env.NODE_ENV === "test") {
  require("raf").polyfill(global);
}