typescript - Issue with globally visible service in Angular 2 -

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i tying make service, visible without importing in component.

my bootstrap function: 

export function main(initialhmrstate?: any): promise<any> {   console.log(app_providers);   return bootstrap(app, [     ...platform_providers,     ...env_providers,     ...app_providers   ])   .then(decoratecomponentref)   .catch(err => console.error(err)); }

app providers definition: 

export * './app.component'; export * './user.state'; export * './app.service';  import { userstate } './user.state'; import { appstate } './app.service';  // application wide providers export const app_providers = [   userstate,   appstate ];

and can not call in components constructor

 constructor( private userstate: userstate ) {}

how can fix problem?

either importing or using string token or opaquetoken , `@inject()

export const app_providers = [   {provide: 'userstate', useclass: userstate},   appstate ]; 
constructor(@inject('userstate') private userstate: ) {}

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