JavaScript Angular 6: setTimeout function is not working in my custom validator angular settimeout function,angularjs settimeout function,angular timeout function,angular

Async validators should be the third argument to FormControl, so you should initialize yours like this:

form = new FormGroup({
    username: new FormControl('', 
    [
      // regular validators
      Validators.required,
      Validators.minLength(3),
      UsernameValidator.cannotContainSpace
    ], 
    [
      // async validators
      UsernameValidator.shouldBeUnique
    ]),
    password: new FormControl('' , Validators.required)
  });
Answer:1

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