/**
 * A small deterministic PRNG for the search's variation and selection, seeded
 * from the master seed string. Threading one RNG through the whole run (plus the
 * seeded battle sub-seeds) is what makes a discovery reproducible.
 */
export declare class Rng {
    private state;
    constructor(seed: string | number);
    /** Next float in [0, 1). */
    next(): number;
    /** Integer in [0, n). */
    int(n: number): number;
    /** A uniformly-random element (undefined for an empty array). */
    pick<T>(items: readonly T[]): T | undefined;
    /** True with probability p. */
    chance(p: number): boolean;
}