Method emit

packages/muya/src/event/index.ts:119–132

* emit custom event

(event: string, ...data: unknown[])

     * emit custom event
     */
    emit(event: string, ...data: unknown[]) {
        const eventListener = this.listeners[event];

        if (eventListener && Array.isArray(eventListener)) {
            // Snapshot before iterating: a once-listener removes itself via
            // off() during emit, which mutates the same array and causes
            // forEach to skip the adjacent element. Iterate a copy instead.
            eventListener.slice().forEach(({ listener, once }) => {
                listener(...data);
                if (once)
                    this.off(event, listener);
            });
        }
    }

    /**
     * Remove all pub/sub subscriptions. Called from muya.destroy() to