import { LitElement } from './LitElement.ts';
import { Runtime } from './makeRuntime.ts';
/**
 * Add this static property to your component to disable shadow root.
 *
 * @remarks
 * Without shadow root, any styles added using the `styles` property will
 * be applied to the entire DOM that the component is attached to, not just to
 * the insides of this component.
 *
 * @example
 * ```ts
 *   static override shadowRootOptions = noShadowRoot;
 * ```
 *
 * @privateRemarks
 * This property is an empty object at runtime for bundle size reasons.
 * While empty object is not a valid shadowRootOption, it is never passed to
 * attachShadow() since we use this exact empty object as a magic value to opt
 * out of shadow root.
 */
export declare const noShadowRoot: ShadowRootInit;
export declare function emptyFunction(): undefined;
/**
 * Exposed as a dev-only util for use by Lumina's mount() test helper. We need
 * to expose a wrapper util because private properties are mangled and so cannot
 * be reliably accessed outside the package.
 * @private
 */
export declare const devOnly$getLitElementTagNameAndRuntime: ((componentClass: typeof LitElement) => {
    tagName: string | undefined;
    runtime: Runtime | undefined;
}) | undefined;