/**
 * To throttle a function means to ensure that the function is called at most once in a specified
 * time period (for instance, once every 10 seconds). This means throttling will prevent
 * a function from running if it has run “recently”.
 *
 * Throttling also ensures a function is run regularly at a fixed rate.
 *
 * @param callback The function the throttle.
 * @param delay Time in milliseconds
 * @returns The throttled function.
 */
export declare function throttle<T extends (...args: Array<any>) => void>(callback: T, delay: number): T;