Function updateValueAndValidity

packages/forms/src/model/abstract_model.ts:1397–1427

(
    opts: {onlySelf?: boolean; emitEvent?: boolean; sourceControl?: AbstractControl} = {},
  )

    sourceControl?: AbstractControl;
  }): void;
  updateValueAndValidity(
    opts: {onlySelf?: boolean; emitEvent?: boolean; sourceControl?: AbstractControl} = {},
  ): void {
    this._setInitialStatus();
    this._updateValue();

    if (this.enabled) {
      const shouldHaveEmitted = this._cancelExistingSubscription();

      (this as Writable<this>).errors = this._runValidator();
      this.status = this._calculateStatus();

      if (this.status === VALID || this.status === PENDING) {
        // If the canceled subscription should have emitted
        // we make sure the async validator emits the status change on completion
        this._runAsyncValidator(shouldHaveEmitted, opts.emitEvent);
      }
    }

    const sourceControl = opts.sourceControl ?? this;
    if (opts.emitEvent !== false) {
      this._events.next(new ValueChangeEvent<TValue>(this.value, sourceControl));
      this._events.next(new StatusChangeEvent(this.status, sourceControl));
      (this.valueChanges as EventEmitter<TValue>).emit(this.value);
      (this.statusChanges as EventEmitter<FormControlStatus>).emit(this.status);
    }

    if (!opts.onlySelf) {
      this._parent?.updateValueAndValidity({...opts, sourceControl});
    }
  }

  /** @internal */
  _updateTreeValidity(opts: {emitEvent?: boolean} = {emitEvent: true}): void {