/**
 * Element that user can interact with,
 * includes `<input>`, `<select>` and `<textarea>`.
 */
export type FieldElement = HTMLInputElement | HTMLSelectElement | HTMLTextAreaElement;
/**
 * HTML Element that can be used as a form control,
 * includes `<input>`, `<select>`, `<textarea>` and `<button>`.
 */
export type FormControl = FieldElement | HTMLButtonElement;
/**
 * Form Control element. It can either be a submit button or a submit input.
 */
export type Submitter = HTMLInputElement | HTMLButtonElement;
/**
 * A type guard to check if the provided element is a form control
 */
export declare function isFormControl(element: unknown): element is FormControl;
/**
 * A type guard to check if the provided element is a field element, which
 * is a form control excluding submit, button and reset type.
 */
export declare function isFieldElement(element: unknown): element is FieldElement;
/**
 * Resolves the action from the submit event
 * with respect to the submitter `formaction` attribute.
 */
export declare function getFormAction(event: SubmitEvent): string;
/**
 * Resolves the encoding type from the submit event
 * with respect to the submitter `formenctype` attribute.
 */
export declare function getFormEncType(event: SubmitEvent): 'application/x-www-form-urlencoded' | 'multipart/form-data';
/**
 * Resolves the method from the submit event
 * with respect to the submitter `formmethod` attribute.
 */
export declare function getFormMethod(event: SubmitEvent): 'GET' | 'POST' | 'PUT' | 'PATCH' | 'DELETE';
/**
 * Trigger a form submit event with an optional submitter.
 * If the submitter is not mounted, it will be appended to the form and removed after submission.
 */
export declare function requestSubmit(form: HTMLFormElement | null | undefined, submitter: Submitter | null): void;