import type { AttributeEdit, TextEdit } from './object-urls.js';
/**
 * Whether a checkbox or a radio is ticked now, or `undefined` for any other element.
 *
 * The one reading of `checked` both the accessibility state and the form state
 * take: the property, which a click moves, and never the attribute, which says
 * only how the markup started.
 */
export declare function liveChecked(element: Element): boolean | undefined;
/** The edit that makes one control's markup say what it holds. */
export type FormEdit = {
    readonly attribute: 'value' | 'checked' | 'selected';
    /** `null` removes the attribute. */
    readonly value: string | null;
} | {
    readonly text: string;
};
export interface FormState {
    /** The edit `element` needs, or `undefined` when its markup already says it. */
    editOf(element: Element): FormEdit | undefined;
    /**
     * `root.outerHTML`, with every edit in the subtree written in, and `also`:
     * attributes and text another reading of the page found it must write, by
     * element.
     *
     * The edits go onto a copy imported into an inert document, never onto the
     * page. Writing them on the live tree and taking them off again is not an
     * inspection: adding `selected` back to an option the page's script moved
     * away from re-selects it, and adding `checked` back to a radio its group
     * unchecked unchecks the other one. An inert document has no browsing
     * context, so the copy runs no custom element constructor and fetches
     * nothing. With no edit, the copy is never made.
     */
    serialize(root: Element, also?: ReadonlyMap<Element, readonly (AttributeEdit | TextEdit)[]>): string;
}
/** One reader per acquisition: it remembers each `<select>` it has asked about. */
export declare function formState(ownerDocument: Document): FormState;
/**
 * `attributes` as the control's markup would carry them, given its edit.
 *
 * The record the snapshot holds, so a key is added or deleted rather than set to
 * an empty marker: a removed `checked` is absent, as it would be in the markup.
 */
export declare function editedAttributes(attributes: Record<string, string>, edit: FormEdit): Record<string, string>;
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