directive
A Directive that adds the required
validator to checkbox controls marked with the required
attribute. The directive is provided with the NG_VALIDATORS
multi-provider list.
input[type=checkbox][required][formControlName]
input[type=checkbox][required][formControl]
input[type=checkbox][required][ngModel]
RequiredValidator
The following example shows how to add a checkbox required validator to an input attached to an ngModel binding.
<input type="checkbox" name="active" ngModel required>
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https://v10.angular.io/api/forms/CheckboxRequiredValidator