Mufasa Mufasa - 1 year ago 376
TypeScript Question

Typescript warnings when using interface and OpaqueToken in Angular 2 app

I have been following the documentation here and use ng-cli.

I created the following configuration file (app-config.ts):

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

export interface AppConfig {
supportTelephoneNumber: string;

export let APP_CONFIG_t = new OpaqueToken('app.config');

export const APP_CONFIG: AppConfig = {
supportTelephoneNumber: '1111 111 1111'

and in my app.module.ts file I have:

declarations: [
imports: [
RouterModule.forRoot(ROUTES, { useHash: true }),
providers: [
{ provide: APP_CONFIG_t, useValue: APP_CONFIG },

I use this configuration in my app.component.ts file like this:

import { Component, Inject } from '@angular/core';
import { APP_CONFIG_t, AppConfig } from './app-config';

selector: 'app-root',
templateUrl: './app.component.html',
styleUrls: ['./app.component.less']
export class AppComponent {
constructor(@Inject(APP_CONFIG_t) public config: AppConfig) {

callSupport(): void {
window.location.href = 'tel:+' + this.config.supportTelephoneNumber;

When I serve my app using ng serve everything seems to work fine but I do see these warnings in the console from where I run ng server:

WARNING in ./src/app/app.component.ts

40:166 export 'AppConfig' was not found in './app-config'

WARNING in ./src/app/app.component.ts

40:195 export 'AppConfig' was not found in './app-config'

Does anyone know what these warnings mean and whether or not I should worry about them?

My Versions

  • OS: Mac OS X El Capitan v10.11.6

  • ng-cli: v1.0.0-beta.16

  • angular: v2.0.1

  • typescript: v2.0.2

Answer Source

As per comment on issue

having the same issue. (Works fine despite warning) are you exporting more than one interface/class/const from the file? issue stopped for me after i exported each interface from its own dedicated file.

meaning if i had one file with multiple exports - i got warnings in build (export 'MyInterface1' was not found in '../file')


export interface MyInterface1 {}
export interface MyInterface2 {}

after refactor - no warning


export interface MyInterface1 {}


export interface MyInterface2 {}
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