import { OpaqueToken } from '@angular/core';

export const EAGER_PROVIDER = new OpaqueToken('EAGER_PROVIDER');

import { InjectionToken } from '@angular/core';

export const EAGER_PROVIDER = new InjectionToken<any>('EAGER_PROVIDER');

Use `InjectionToken` instead of `OpaqueToken` to support Angular 5
Use `InjectionToken` instead of `OpaqueToken` to support Angular 5
