/**
 * Seeded pseudo-random number generator using the mulberry32 algorithm.
 * Produces deterministic sequences for reproducible test runs.
 */
export declare class SeededRandom {
    private state;
    constructor(seed: number);
    /** Returns a float in [0, 1). */
    next(): number;
    /** Returns an integer in [min, max] inclusive. */
    nextInt(min: number, max: number): number;
    /** Pick a random element from an array. */
    pick<T>(items: readonly T[]): T;
    /** Pick `count` random elements from an array (with replacement). */
    pickN<T>(items: readonly T[], count: number): T[];
    /** Shuffle array in place (Fisher-Yates). */
    shuffle<T>(items: T[]): T[];
    /** Returns true with probability p (0-1). */
    chance(p: number): boolean;
    /**
     * Generate a hex id of the given length.
     * By default produces 12-char ids matching the MEMORY_ID_PATTERN.
     */
    hexId(length?: number): string;
}
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