import { HttpClient } from '@angular/common/http';
import { AuthenticationService } from './authentication.service';
import { Observable } from 'rxjs';
import * as i0 from "@angular/core";
export declare class PliCnfLetterTemplateTypeService {
    private environment;
    private httpClient;
    private authService;
    private headerJson;
    constructor(environment: any, httpClient: HttpClient, authService: AuthenticationService);
    /** It returns the letter template types */
    getAll(): Observable<any>;
    static ɵfac: i0.ɵɵFactoryDeclaration<PliCnfLetterTemplateTypeService, never>;
    static ɵprov: i0.ɵɵInjectableDeclaration<PliCnfLetterTemplateTypeService>;
}