Function makeEventHandler

lib/internal/event_target.js:1121–1132

(handler)

}

function makeEventHandler(handler) {
  // Event handlers are dispatched in the order they were first set
  // See https://github.com/nodejs/node/pull/35949#issuecomment-722496598
  function eventHandler(...args) {
    if (typeof eventHandler.handler !== 'function') {
      return;
    }
    return ReflectApply(eventHandler.handler, this, args);
  }
  eventHandler.handler = handler;
  return eventHandler;
}

function defineEventHandler(emitter, name, event = name) {
  // 8.1.5.1 Event handlers - basically `on[eventName]` attributes