import type{LitElement}from'lit';
/** A write to the public `form` IDL may name an owner by id while reads stay element-valued. */
export type FormOwnerValue=string|HTMLFormElement|null;
/** Reflects a form-owner ID without changing the element-valued read contract. */
export declare function setFormOwner(host:HTMLElement,owner:FormOwnerValue):void;
/** Returns the browser-resolved form owner for a form-associated custom element. */
export declare function getFormOwner(internals:ElementInternals):HTMLFormElement|null;interface DirectCustomErrorHost extends LitElement{setCustomValidity(message:string):void;resetValidity?():void;}
/** Installs the reflected `customError` IDL on a control that manages ElementInternals directly. */
export declare function installCustomErrorProperty(host:DirectCustomErrorHost,getCustomValidityMessage:()=>string):void;export{};