/**
 * Seeded pseudo-random number generator (Mulberry32).
 * Deterministic: same seed always produces same sequence.
 */
export declare class SeededRNG {
    private state;
    constructor(seed: number);
    /** Returns a float in [0, 1) */
    next(): number;
    /** Returns a float in [min, max) */
    range(min: number, max: number): number;
    /** Returns an integer in [min, max] */
    int(min: number, max: number): number;
    /** Pick a random element from an array */
    pick<T>(arr: T[]): T;
    /** Gaussian-distributed random (Box-Muller), mean 0, stddev 1 */
    gaussian(): number;
    /** Returns a boolean with given probability */
    chance(probability: number): boolean;
}