如何在反应式角度窗体上初始化时根据另一个窗体控件的值禁用该窗体控件？

formGroup: FormGroup;

constructor() {
  this.formGroup = new FormGroup({
    control1: new FormControl()
  });
}

import { Subscription } from 'rxjs';

subscription: Subscription;

ngOnInit() {
  this.subscription = this.formGroup.get('control2').valueChanges.subscribe(value => {
    if (value === 'some value') {
      this.formGroup.get('control1').disable();
    } else {
      this.formGroup.get('control1').enable();
    }
  });
}

ngOnDestroy() {
  this.subscription.unsubscribe();
}