/**
 * A random number generator. Should return floats in the interval [0, 1), like
 * Math.random().
 */
export type RNG = () => number;
export declare const seededRNG: (seed: number) => RNG;
/**
 * Shuffle an array using a given random seed or function.
 * If `ensurePermuted` is true, the input and output are guaranteed to be
 * distinct permutations.
 */
export declare function shuffle<T>(array: ReadonlyArray<T>, randomSeed: number | RNG, ensurePermuted?: boolean): T[];
export declare function constrainedShuffle<T>(array: readonly T[], random: RNG, isValidShuffle: (shuffled: readonly T[]) => boolean): T[];
export declare function randomIntInRange(min: number, max: number, random: RNG): number;
export declare const random: RNG;