VSCode源码分析 - 事件分发

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    if (this._listeners) {
        // 内部/嵌套方式通过emit发出.
        // this调用事件驱动
        if (!this._deliveryQueue) {
            this._deliveryQueue = new LinkedList();
        }
        for (let iter = this._listeners.iterator(), e = iter.next(); !e.done; e = iter.next()) {
            this._deliveryQueue.push([e.value, event]);
        }
            const [listener, event] = this._deliveryQueue.shift()!;
            try {
                if (typeof listener === 'function') {
                } else {
                    listener[0].call(listener[1], event);
                }
            } catch (e) {
                onUnexpectedError(e);
            }
        }