src/vs/base/common/event.ts/Emitter/constructor
class Emitter:	constructor(options?: EmitterOptions) {
		this._options = options;
		this._leakageMon = _globalLeakWarningThreshold > 0 || this._options?.leakWarningThreshold ? new LeakageMonitor(this._options?.leakWarningThreshold ?? _globalLeakWarningThreshold) : undefined;
		this._perfMon = this._options?._profName ? new EventProfiling(this._options._profName) : undefined;
		this._deliveryQueue = this._options?.deliveryQueue;
	}