获取最后发出的值FormGroup.valueChanges Angular SwitchMap rxjs

Question

我目前正在使用debounceTime(400)作为解决方法。我试图获取FormGroup.valueChanges的最后一个发出的值，该值在启动时会触发6次。我希望它仅使用最后发出的值触发一次。

listenToFormChanges(): void {
    this.requestFormGroup.valueChanges.pipe(SwitchMap(data => of (data)), ).subscribe(
        (data: any) => {
            if (this.model.isEditable) {
                this.model.requestType = data.requestType;
                this.model.requestDeviceType = data.requestDeviceType;
                this.model.requestSubtype = data.requestSubtype;
                this.model.requestDeviceSerialNumber = data.requestDeviceSerialNumber;
                this.model.title = data.title;
                this.model.phase = data.phase;
                this.model.quantity = data.quantity;
                this.model.description = data.description;
                this.model.pickupLocation = data.pickupLocation;
                this.model.state = data.state;
                this.model.priority = data.priority;
                this.model.team = data.team;
                this.isChanged = this.isFormChanged(this.originalRequestFormGroup, this.requestFormGroup);
            }
        }
    );
}