I'm use https://angular.io/guide/quickstart to start learn Angular2, but I notice there's console log "Angular 2 is running in the development mode. Call enableProdMode() to enable the production mode." So I added to main.ts as following.
import { bootstrap } from '@angular/platform-browser-dynamic';
import { AppComponent } from './app.component';
enableProdMode();
bootstrap(AppComponent);
enableProdMode is not defined(…)
Seems like you missed to import enableProdMode
import {enableProdMode} from '@angular/core';