/**
 * Triggers native-like implicit form submission (e.g. from an Enter key press).
 * Native behavior:
 * 1. If form has a submit button (native or custom), click it.
 * 2. If it has no submit button, it submits implicitly ONLY IF there is 1 single-line text input.
 */
export declare const triggerImplicitSubmit: (form: HTMLFormElement | null | undefined, hostEl?: HTMLElement, activeEl?: Element | null) => void;