/**
 * 1D Perlin noise. Returns a value in [-1, 1] that varies smoothly with the input `x` —
 * small changes in `x` produce small changes in output (no wild jumps). Three separate calls
 * with different `x` offsets (e.g. `perlin1d(t)`, `perlin1d(t + 100)`, `perlin1d(t + 200)`)
 * produce three independent but individually smooth noise channels.
 *
 * This is the canonical Perlin noise algorithm with the 256-entry permutation table from
 * Bevy's `2d_screen_shake` example. Use for camera shake, procedural terrain, organic
 * motion, and any effect that needs smooth pseudo-random variation.
 */
export declare function perlin1d(x: number): number;
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