clear active timers in Javascript

clear_timers.js

for (handle of process._getActiveHandles()) {
  // if (handle instanceof Timer) { // doesn't work because Timer isn't defined, even though handle.constructor.name=="Timer"
  if ('_list' in handle) {
    for (timername in handle._list) {
      clearTimeout(handle._list[timername]);
    }
  }
}