/**
 * Two octaves of value noise at an irrational ratio, −1 … 1. One octave eases
 * into every lattice point and the pause there shows as a beat; the second,
 * off the first's grid, fills it in.
 */
export declare function organicNoise(seed: number, x: number): number;
/** Lobe `index`'s height at organic time `t`, −1 … 1. */
export declare function organicLobeLift(index: number, t: number): number;
/** Lobe `index`'s sideways drift at organic time `t`, −1 … 1 — slower than its height. */
export declare function organicLobeShift(index: number, t: number): number;
/** The whole arch's sway, −1 … 1: two periods (1.73 s, 2.89 s) that never line up. */
export declare function organicSway(t: number): number;
/** Which way the band's bell leans, −1 … 1: added to its skew, so one side runs long. */
export declare function organicLean(t: number): number;
/** How far the arch's crest rises past its share of the level, −1 … 1. */
export declare function organicCrest(t: number): number;
/** One frame of the band line's bumps: each wave's amplitude and drift at one instant. */
export interface OrganicRippleFrame {
    amplitude: number[];
    shift: number[];
}
/**
 * The bumps' state at organic time `t`, written into `out`. Computed once per
 * frame: only where along the line each sample sits changes between samples.
 */
export declare function organicRippleFrame(t: number, out: OrganicRippleFrame): OrganicRippleFrame;
/** The band line's displacement at `u` (−1 … 1 across the bell) for one frame, −1 … 1. */
export declare function organicRippleAt(u: number, frame: OrganicRippleFrame): number;
/** The band line's displacement at `u` and organic time `t`, −1 … 1: both steps at once. */
export declare function organicRipple(u: number, t: number): number;