import type { Nullable } from '../../../Types/Nullable';
import type { ElementValidationError } from './Abstracts/Interfaces/IElementValidator';
/**
 * Validator that requires the control have a non-empty value.
 *
 * State:
 * * badInput
 *
 * @public
 * @param control
 * @returns null if the validation check passes, otherwise an object containing information.
 */
export declare function blankValidator(control: HTMLElement & {
    value: string | null;
}): Nullable<ElementValidationError>;
/**
 * Checks if the value is blank.
 *
 * @param value - The value to check.
 * @returns True if the value is blank, false otherwise.
 */
export declare function isBlankValue(value: unknown): boolean;
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