on()

in packages/rc-components/rc-console-menu/src/eventEmitter.ts [8:12]

• 5 lines of code
• 2 McCabe index (conditional complexity)

  on(event: string, listener: L) {
    if (!this.events[event]) this.events[event] = [];
    this.events[event].push(listener);
    return () => this.removeListener(event, listener);
  }