Function debounce

src/helpers/helpers.extras.ts:50–61

(fn: (...args: TArgs) => void, delay: number)

 * Debounces calling `fn` for `delay` ms
 */
export function debounce<TArgs extends Array<any>>(fn: (...args: TArgs) => void, delay: number) {
  let timeout;
  return function(...args: TArgs) {
    if (delay) {
      clearTimeout(timeout);
      timeout = setTimeout(fn, delay, args);
    } else {
      fn.apply(this, args);
    }
    return delay;
  };
}

/**
 * Converts 'start' to 'left', 'end' to 'right' and others to 'center'