export declare class HelpersService {
    private getHiddenProperty;
    isBrowserTabActive(): boolean;
    areCaseInsensitiveEqual(value1: string, value2: string): boolean;
    shortId(): string;
    isBrowser(): boolean;
    base64Encode(input: string): string;
    base64Decode(input: string): string;
    stringToByteArray(str: string, base64Encoded?: boolean): Uint8Array;
    concatenateArrays(...arrays: Uint8Array[]): Uint8Array;
    calculateMD5(str: string | Uint8Array): string;
}