/**
 * Create a random jitter generator function.
 * @param r - Jitter factor around median.
 * @param x - Median value.
 * @returns Jitter generator function.
 *
 * @remarks
 * Each time the returned jitter generator function is called, it returns a number within
 * `[x*(1-r), x*(1+r)]` range. For example, `randomJitter(0.1, 2)` creates a jitter generator
 * function that returns random values within `[1.8, 2.2]` range.
 */
export declare function randomJitter(r: number, x?: number): () => number;
export declare namespace randomJitter {
    /** Create a random generator function between `[min,max]`. */
    function between(min: number, max: number): () => number;
}