src/vs/base/parts/ipc/common/ipc.ts/requestTypeToStr
function requestTypeToStr(type: RequestType): string {
	switch (type) {
		case RequestType.Promise:
			return 'req';
		case RequestType.PromiseCancel:
			return 'cancel';
		case RequestType.EventListen:
			return 'subscribe';
		case RequestType.EventDispose:
			return 'unsubscribe';
	}
}