All files theme.reducer.ts

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import { Injectable, Provider } from '@angular/core';
import { createReducer, on } from '@ngrx/store';
 
import { themeAction } from './theme.actions';
import { themeReducerConfig } from './theme.interface';
 
@Injectable({
  providedIn: 'root',
})
export class AppThemeReducer {
  public createReducer() {
    return createReducer(
      themeReducerConfig.initialState,
      on(themeAction.enableDarkTheme, () => ({ darkThemeEnabled: true })),
      on(themeAction.disableDarkTheme, () => ({ darkThemeEnabled: false })),
    );
  }
}
 
export const themeReducerProvider: Provider = {
  provide: themeReducerConfig.token,
  deps: [AppThemeReducer],
  useFactory: (reducer: AppThemeReducer) => reducer.createReducer(),
};