import { HttpHeaders } from '@angular/common/http';
import { Observable, BehaviorSubject } from 'rxjs';
export declare class Constants {
    static protocol: string;
    static identityServer: string;
    static fileServer: string;
    static eventServer: string;
    static nameServer: string;
    static max_file_size: number;
    static httpOptions: {
        headers: HttpHeaders;
        withCredentials: boolean;
    };
    static change: BehaviorSubject<boolean>;
    static onChange: Observable<boolean>;
    static broadcast(): void;
    static apply(settings: any): void;
}