/**
 * Telling a server-rendered element apart, from the DOM alone.
 *
 * Lit's server renderer marks each template it writes with a
 * `<!--lit-part DIGEST-->` comment, and hydration keeps those markers; a
 * template rendered in the browser marks its parts differently. So a shadow
 * root that holds one at its top level came from the server, before and
 * after hydration. Dependency-free: the HMR patch and the inspector both
 * ask.
 *
 * @module
 */
/** Whether `root` holds HTML Lit rendered on the server. */
export declare const hasServerRender: (root: ParentNode) => boolean;
/**
 * Where a server-rendered element stands: held back by `defer-hydration`,
 * waiting for its first update, or hydrated. `undefined` for an element the
 * browser rendered.
 */
export type HydrationState = 'deferred' | 'pending' | 'hydrated';
export declare const hydrationStateOf: (el: Element & {
    hasUpdated?: boolean;
}) => HydrationState | undefined;
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