/**
 * This function aggregate events and call the callback with aggregated events every {delay}
 *
 * @param delay delay between each call
 * @param map a function to transform event from {INPUT} to {OUTPUT}
 * @param callback a callback called with aggregated events every x ms
 * @returns a function that take as argument (INPUT)=>void
 */
export declare function aggregate<INPUT, OUTPUT>(delay: number, map: (input: INPUT) => OUTPUT, callback: (aggregated: OUTPUT[]) => void): (arg: INPUT) => void;