Method event

src/platform/common/utils/events.ts:63–73

()

    private _event: Event<T> | undefined;

    public get event(): Event<T> {
        if (!this._event) {
            this._event = (listener: (e: T) => unknown, thisArg?: unknown, disposables?: Disposable[]): Disposable => {
                this._listeners.add(thisArg ? listener.bind(thisArg) : listener);
                const disposable = new Disposable(() => this._listeners.delete(listener));
                disposables?.push(disposable);
                return disposable;
            };
        }
        return this._event;
    }

    async fireAsync(data: IWaitUntilData<T>, token: CancellationToken): Promise<void> {
        if (!this._listeners) {