client/src/main.ts


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import { enableProdMode } from '@angular/core'
import { platformBrowserDynamic } from '@angular/platform-browser-dynamic'

import { AppModule } from './app/app.module'
import { environment } from './environments/environment'

import { hmrBootstrap } from './hmr'

if (environment.production) {
  enableProdMode()
}

const bootstrap = () => platformBrowserDynamic()
  .bootstrapModule(AppModule)
  .then(bootstrapModule => {
    // TODO: Remove when https://github.com/angular/angular-cli/issues/8779 is fixed?
    if ('serviceWorker' in navigator && environment.production) {
      navigator.serviceWorker.register('/ngsw-worker.js')
        .catch(err => console.error('Cannot register service worker.', err))
    }

    return bootstrapModule
  })
  .catch(err => {
    console.error(err)
    return null
  })

if (environment.hmr) {
  if (module[ 'hot' ]) {
    hmrBootstrap(module, bootstrap)
  } else {
    console.error('HMR is not enabled for webpack-dev-server!')
    console.log('Are you using the --hmr flag for ng serve?')
  }
} else {
  bootstrap()
}