dex/src/lib/tap-code.js

/**
 * Fire `fn` after `count` taps/clicks land on `node` within `windowMs` of
 * each other — a quiet way to hide a shortcut behind a bit of fidgeting.
 * Returns an unbind.
 */
export function onTapCode(node, fn, { count = 7, windowMs = 1500 } = {}) {
  let n = 0;
  let timer = null;
  const onClick = () => {
    n += 1;
    clearTimeout(timer);
    timer = setTimeout(() => (n = 0), windowMs);
    if (n >= count) {
      n = 0;
      fn();
    }
  };
  node.addEventListener('click', onClick);
  return () => {
    clearTimeout(timer);
    node.removeEventListener('click', onClick);
  };
}