app.module.ts

...
import { NgReduxModule, DevToolsExtension } from '@angular-redux/store';

import { ColorActions } from './color/color.action';

@NgModule({
  ...
  imports: [
    BrowserModule,
    IonicModule.forRoot(MyApp),
    NgReduxModule
  ],
  providers: [
    StatusBar,
    SplashScreen,
    {provide: ErrorHandler, useClass: IonicErrorHandler},
    ColorActions,
    DevToolsExtension
  ]
})
export class AppModule {}