import { HttpEvent, HttpHandler, HttpInterceptor, HttpRequest } from '@angular/common/http';
import { Observable } from 'rxjs';
import { TranslateService } from '@ngx-translate/core';
import * as i0 from "@angular/core";
export declare const LANG_PARAM_KEY = "X-Lang-Param";
/**
 * Interceptor for adding the current language as parameter
 * Add the header (LANG_PARAM_KEY, <language parameter>) to your request http headers
 */
export declare class AddLangParamInterceptor implements HttpInterceptor {
    protected translateService: TranslateService;
    constructor(translateService: TranslateService);
    intercept<T>(req: HttpRequest<T>, next: HttpHandler): Observable<HttpEvent<T>>;
    static ɵfac: i0.ɵɵFactoryDeclaration<AddLangParamInterceptor, never>;
    static ɵprov: i0.ɵɵInjectableDeclaration<AddLangParamInterceptor>;
}
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