export interface UseFormProps<T> {
    initialValues: T;
    validate?: (values: T) => FormErrors<T> | Promise<FormErrors<T>> | undefined | Promise<undefined> | void | Promise<void>;
    onSubmit?: (values: T, helpers: FormSetters<T>) => Promise<void> | void;
    onChange?: (values: T) => Promise<void> | void;
}
export interface FormHandler<T> extends FormSetters<T> {
    submit: () => Promise<void>;
    reset: () => void;
    validate: () => void;
    values: T;
    errors: FormErrors<T>;
    changes: FormChanged<T>;
    submitting: boolean;
    submitCount: number;
    changed: boolean;
}
export interface FormSetters<T> {
    setFieldError: (field: keyof T, message?: string) => void;
    setFieldValue: {
        (field: keyof T): (value: T[keyof T]) => void;
        (field: keyof T, value: T[keyof T]): void;
    };
    setValues: (values: Partial<T>) => void;
    setSubmitting: (submitting: boolean) => void;
    setErrors: (errors: FormErrors<T>) => void;
    reset: () => void;
}
export type FormErrors<T> = {
    [key in keyof T]?: string;
};
export type FormChanged<T> = {
    [key in keyof T]?: boolean;
};
export declare function useForm<T>(props: UseFormProps<T>): FormHandler<T>;