How to fire the `valueChanges` programmatically?

I found a solution which worked for me. I forgot two parameters in the updateValueAndValidity function.

• onlySelf: will only update this FormControl when true.
• emitEvent: will cause valueChanges event to be fired when true.

So as result you will get something like:
FormGroup.updateValueAndValidity({ onlySelf: false, emitEvent: true });