/TypeScript/Based on previous make validation for required in reactive forms

Based on previous make validation for required in reactive forms

this.userCustomForm.get('age').valueChanges.subscribe(val => {
  if (condition) {
    this.userCustomForm.controls['licenseNo'].setValidators([Validators.required]);
  } else {
    this.userCustomForm.controls['licenseNo'].clearValidators();
  }
  this.userCustomForm.controls['licenseNo'].updateValueAndValidity();
});

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