src/util/isHotReloading.js
// @flow
const isHotReloading = (): boolean => {
const castModule: any = typeof module !== 'undefined' && module
return !!(
castModule &&
castModule.hot &&
typeof castModule.hot.status === 'function' &&
castModule.hot.status() === 'apply'
)
}
export default isHotReloading