import { Observable } from 'rxjs';
export declare class HelperService {
    constructor();
    roleFilter(ref: any, role: any, uid: any, type?: string): any;
}
export declare function componentDestroyed(component: {
    ngOnDestroy(): void;
}): Observable<true>;
export declare function untilComponentDestroyed<T>(component: {
    ngOnDestroy(): void;
}): (source: Observable<T>) => Observable<T>;
export declare function getInterpolation(text: string): string[];