Basic javascript stopwatch object

stopwatch.js

function StopWatch() {
  let started = Date.now(),
    time = 0,
    running = false;

  function getTime() {
    return running ? Date.now() - started : time;
  }

  function start() {
    if (!running) {
      started = Date.now() - time;
      running = true;
    }
  }

  function stop() {
    if (running) {
      time = getTime();
      running = false;
    }
  }

  function toggle() {
    (running ? stop : start)();
  }

  function reset() {
    started = Date.now();
    time = 0;
  }

  return {
    getTime,
    start,
    stop,
    toggle,
    reset,
  }
}