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@angular/formscode
AsyncValidatorFn
interface
stable
A function that receives a control and returns a Promise or observable that emits validation errors if present, otherwise null.
Creating asynchronous validatorsOn this page
API
interface AsyncValidatorFn { (control: AbstractControl<any, any, any>): Promise<ValidationErrors | null> | Observable<ValidationErrors | null>;}
Promise<ValidationErrors | null> | Observable<ValidationErrors | null>@returns
Promise<ValidationErrors | null> | Observable<ValidationErrors | null>Jump to details