/**
 * Basic validation and submit handling for a form with a single input.
 */
export default function useFormValidation(fieldName: string): {
    valid: import("@preact/signals-core").Signal<boolean>;
    submitting: import("@preact/signals-core").Signal<boolean>;
    handleSubmit: (event: any) => void;
    handleBlur: (value: string) => void;
    handleInput: (value: string) => void;
};