export declare function randomDigits(prng: () => number, length: number): string;
export declare function randomChars(prng: () => number, alphabet: string, length: number): string;
export declare function randomNonRepeatedDigits(prng: () => number, length: number): string;
export declare function luhnCheckDigit(payload: string): number;
export declare function weightedSum(source: string, weights: readonly number[]): number;
export declare function groupEvery(value: string, size: number, delimiter: string): string;
export declare function groupFromRight(value: string, size: number, delimiter: string): string;
export declare function allSame(value: string): boolean;
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