courses.tokens.ts

import {InjectionToken} from '@angular/core';
import {StoreConfig} from '@ngrx/store/src/store_module';
import * as fromReducer from './reducers/courses.reducer';
import * as fromActions from './actions/courses.actions';

export const COURSES_STORAGE_KEYS = 
  new InjectionToken<keyof fromReducer.State[]>('CoursesStorageKeys');
export const COURSES_LOCAL_STORAGE_KEY =
  new InjectionToken<string[]>('CoursesStorage');
export const COURSES_CONFIG_TOKEN = 
 new InjectionToken<StoreConfig<fromReducer.State, fromActions.CoursesActions>>('CoursesConfigToken');