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GeezerVison is showing next.angular.dev — AsyncValidatorFn • Angular

API

    
      interface AsyncValidatorFn {  (control: AbstractControl<any, any, any>): Promise<ValidationErrors | null> | Observable<ValidationErrors | null>;}

@paramcontrolAbstractControl<any, any, any>

@returnsPromise<ValidationErrors | null> | Observable<ValidationErrors | null>

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