export declare const memoizeOnce: <A, B>(f: (x: A) => B) => (x: A) => B;
export declare const cheksumConfig: (x: any) => number;
export declare const cheksum64str: (str: string) => string;
export declare const isExternalLink: (link: string) => boolean;
export declare const symmetricDifference: <T>(arrayA: T[], arrayB: T[]) => T[];