// fetch() polyfill for making API calls.
// Support for...of (a commonly used syntax feature that requires Symbols)
import 'core-js/es/symbol'

// Support iterable spread (...Set, ...Map)
import 'core-js/features/array/from'

// React 16+ relies on Map, Set, and requestAnimationFrame
import 'core-js/es/map'

import 'core-js/es/set'

if (process.env.NODE_ENV !== 'test') {
  require('whatwg-fetch')
}

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')
}

// 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)
}