import type { SeededRng } from '../types.js';
/** Tiny fast seeded PRNG: returns a `() => number` yielding uniform values in [0, 1). Same seed → same stream. */
export declare function mulberry32(seed: number): () => number;
/** Stateless 2D coordinate hash to [0, 1) — cheap lattice noise, no seed state. */
export declare function hash2(x: number, y: number): number;
/** Stateless 3D coordinate hash to [0, 1). */
export declare function hash3(x: number, y: number, z: number): number;
/** Linear interpolation from `a` to `b` by `t`. */
export declare function lerp(a: number, b: number, t: number): number;
/** Hermite smoothstep: 0 below `edge0`, 1 above `edge1`, smooth in between. */
export declare function smoothstep(edge0: number, edge1: number, x: number): number;
/**
 * Seeded random stream with the fork-per-consumer determinism API: seed
 * once, `fork(label)` a deterministic sub-stream per consumer, and build
 * order or replay never changes the output.
 *
 * @param seed - Any integer.
 * @returns A `SeededRng` with `next`/`range`/`int`/`pick`/`fork`.
 * @example
 * const rng = createSeededRng(42)
 * const grass = rng.fork('grass')   // stable regardless of call order
 */
export declare function createSeededRng(seed: number): SeededRng;
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