import { TemplateRef } from '@angular/core';
import { Observable } from 'rxjs/Observable';
import { JsonService } from '../json/json.service';
import { Http } from '@angular/http';
export declare class HeaderService extends JsonService {
    http: Http;
    private _state;
    readonly contents: Observable<TemplateRef<any> | null>;
    constructor(http: Http);
    setContents(ref: TemplateRef<any>): void;
    clearContents(): void;
}