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1. No WhiteSpace Validator for reactive... No WhiteSpace Validator for reactive form control

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   import { AbstractControl } from '@angular/forms';

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   public noWhitespaceValidator(control: AbstractControl) { 

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   	if (control.value.length === 0) {

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   		return null;

2. Empty validator to reactive form con... Empty validator to reactive form control

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   import { AbstractControl, ValidationErrors } from '@angular/forms';

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   public customIsEmpty(control: AbstractControl): ValidationErrors {

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   	if (control.value.trim().length === 0) {

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   		return {isEmpty: true};