import { CheckboxRequiredValidator, EmailValidator, MaxLengthValidator, MinLengthValidator, PatternValidator, RequiredValidator } from '@angular/forms';
export declare const EXPRESSION_REQUIRED_VALIDATOR: any;
export declare class ExpressionRequiredValidatorDirective extends RequiredValidator {
}
export declare const EXPRESSION_EMAIL_VALIDATOR: any;
export declare class ExpressionEmailValidatorDirective extends EmailValidator {
}
export declare const EXPRESSION_CHECKBOX_REQUIRED_VALIDATOR: any;
export declare class ExpressionCheckboxRequiredValidatorDirective extends CheckboxRequiredValidator {
}
export declare const EXPRESSION_MIN_LENGTH_VALIDATOR: any;
export declare class ExpressionMinLengthValidatorDirective extends MinLengthValidator {
}
export declare const EXPRESSION_MAX_LENGTH_VALIDATOR: any;
export declare class ExpressionMaxLengthValidatorDirective extends MaxLengthValidator {
}
export declare const EXPRESSION_PATTERN_VALIDATOR: any;
export declare class ExpressionPatternValidatorDirective extends PatternValidator {
}