/**
 * In-place custom element class patching.
 *
 * Vite HMR re-executes an edited component module, which calls
 * `customElements.define()` again with a freshly evaluated class. The
 * platform registry can't re-define a tag, and live instances keep their
 * original prototype chain, so instead of swapping classes we intercept the
 * duplicate define and patch the originally-registered class in place:
 * copy prototype + static descriptors from the new class onto the old one
 * and nudge live instances to re-render.
 *
 * This module is dependency-free and duck-typed against ReactiveElement so
 * it never imports lit (keeps it version-agnostic and safe for non-Lit
 * custom elements, which get prototype/static patching only).
 */
import { type ChildStateMode } from './child-state.js';
export interface PatchOptions {
    /**
     * Cycle `disconnectedCallback()`/`connectedCallback()` on live instances
     * after a hot patch. Defaults to `false`.
     */
    reconnect?: boolean;
    /**
     * What to do when a component can't be hot-patched in place (e.g.
     * standard `accessor` decorators). Defaults to `'reload'`.
     */
    onIncompatible?: 'reload' | 'warn';
    /**
     * What happens to custom elements a hot patch re-creates (an edited
     * template clones fresh DOM): `'reset'` leaves them at their defaults,
     * `'transfer'` copies the old element's state onto the new one, `'reuse'`
     * puts the old element back where the new one carries no bindings (and
     * transfers otherwise). Defaults to `'transfer'`.
     */
    childState?: ChildStateMode;
}
/**
 * Syncs own members `source` → `target`: deletes own keys of `target` that
 * vanished from `source`, then copies every own descriptor of `source`.
 * Individual copies are best-effort (non-configurable slots are skipped).
 */
export declare const syncOwnMembers: (target: object, source: object, skip: ReadonlyArray<PropertyKey>) => void;
/**
 * Installs the `customElements.define` interceptor. Idempotent (per-page
 * global guard); no-ops in environments without `customElements` (SSR).
 */
export declare const install: (options?: PatchOptions) => void;
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