/**
 *  Copyright (c) 2021 GraphQL Contributors.
 *
 *  This source code is licensed under the MIT license found in the
 *  LICENSE file in the root directory of this source tree.
 */

/**
 * Provided a duration and a function, returns a new function which is called
 * `duration` milliseconds after the last call.
 */
export default function debounce<F extends (...args: any[]) => any>(
  duration: number,
  fn: F,
) {
  let timeout: number | null;
  return function (this: any, ...args: Parameters<F>) {
    if (timeout) {
      window.clearTimeout(timeout);
    }
    timeout = window.setTimeout(() => {
      timeout = null;
      fn.apply(this, args);
    }, duration);
  };
}