ValidatorFn
interface
A function that receives a control and synchronously returns a map of validation errors if present, otherwise null.
API
interface ValidatorFn { (control: AbstractControl<any, any>): ValidationErrors | null;}
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A function that receives a control and synchronously returns a map of validation errors if present, otherwise null.
interface ValidatorFn { (control: AbstractControl<any, any>): ValidationErrors | null;}