/**
 * `<bs-form>` — a thin wrapper around a native `<form>`.
 *
 * Wraps its children in a real light-DOM `<form>` so they participate in
 * native form submission, validation, and FormData / `<input>` autofill
 * out of the box. Hoists submit into a single cancellable `bs-submit`
 * event whose `detail.formData` is a fresh snapshot.
 *
 * **Why a light-DOM `<form>`?** Browser autofill heuristics and password
 * managers (Chrome, Safari, Firefox, 1Password, Bitwarden, …) walk the
 * light-DOM tree looking for `<input name="…" autocomplete="…">` inside
 * a `<form>`. They also anchor their autofill UI to the focused
 * light-DOM control. Our `bs-input` / `bs-textarea` / `bs-select` /
 * `bs-range` / `bs-form-check` therefore render their native control
 * into light DOM (Ionic, Adobe Spectrum, Lion, Carbon all do the same)
 * — `bs-form` simply provides the `<form>` ancestor.
 *
 * Implementation detail: extends `HTMLElement` directly (not
 * `LitElement`). When `createRenderRoot()` returns the host (light DOM),
 * Lit's render pipeline replaces the host's contents on every render —
 * which would blow away the `<form>` we just created. The component's
 * DOM is trivial enough that hand-rolling on `HTMLElement` with
 * `attributeChangedCallback` is both simpler and correct.
 *
 * Attributes:
 * - `action`, `method`, `target`, `enctype` — passed through to the
 *   inner `<form>`.
 * - `novalidate` — disable native constraint validation before submit.
 * - `validated` — applies Bootstrap's `.was-validated` state for
 *   validation styling. Set automatically after the first submit unless
 *   `novalidate` is present.
 *
 * Events:
 * - `bs-submit` — fires on submit with `{ detail: { formData, form,
 *   originalEvent } }`. Cancellable — `preventDefault()` stops the
 *   underlying form submission.
 */
export declare class BsForm extends HTMLElement {
    static observedAttributes: string[];
    private _form?;
    private _observer?;
    private _upgraded;
    connectedCallback(): void;
    disconnectedCallback(): void;
    attributeChangedCallback(): void;
    get action(): string | null;
    set action(v: string | null);
    get method(): string | null;
    set method(v: string | null);
    get target(): string | null;
    set target(v: string | null);
    get enctype(): string | null;
    set enctype(v: string | null);
    get novalidate(): boolean;
    set novalidate(v: boolean);
    get validated(): boolean;
    set validated(v: boolean);
    /** Resets the inner form and clears the `validated` state. */
    reset(): void;
    checkValidity(): boolean;
    reportValidity(): boolean;
    /** Returns a fresh FormData snapshot. */
    get formData(): FormData;
    /** The native `<form>` instance (read-only after first connect). */
    get nativeForm(): HTMLFormElement | null;
    private _ensureForm;
    private _syncFormAttrs;
    private _onMutate;
    private _onSubmit;
}
declare global {
    interface HTMLElementTagNameMap {
        'bs-form': BsForm;
    }
}
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