Method emit

packages/react-devtools-shared/src/events.js:28–57

(event: Event, ...args: Events[Event])

  }

  emit<Event: $Keys<Events>>(event: Event, ...args: Events[Event]): void {
    const listeners = this.listenersMap.get(event);
    if (listeners !== undefined) {
      if (listeners.length === 1) {
        // No need to clone or try/catch
        const listener = listeners[0];
        listener.apply(null, args);
      } else {
        let didThrow = false;
        let caughtError = null;

        const clonedListeners = Array.from(listeners);
        for (let i = 0; i < clonedListeners.length; i++) {
          const listener = clonedListeners[i];
          try {
            listener.apply(null, args);
          } catch (error) {
            if (caughtError === null) {
              didThrow = true;
              caughtError = error;
            }
          }
        }

        if (didThrow) {
          throw caughtError;
        }
      }
    }
  }

  removeAllListeners(): void {
    this.listenersMap.clear();