/**
 * The Lit DevTools app in Astro's dev toolbar: the panel the plugin serves at
 * `/__lit/`, in an iframe in a toolbar window. Loaded in the page by Astro
 * from the path `astro.ts` registers, so it imports nothing.
 *
 * The panel's RPC asks for devframe's one-time code unless client auth is
 * off, and devframe only prompts for it in a top-level page, never in a
 * frame. So the window asks instead, when the server says a code is needed
 * and this browser holds no token yet, and hands the code to the panel in
 * its URL fragment, where devframe reads it. The link devframe prints with
 * the code opens the panel at `/__lit/` itself, whose token then serves this
 * window too.
 */
/** The slice of Astro's `ToolbarAppEventTarget` the app uses. */
interface ToolbarApp {
    onToggled(callback: (options: {
        state: boolean;
    }) => void): void;
    onToolbarPlacementUpdated(callback: (options: {
        placement: string;
    }) => void): void;
}
/** The slice of Astro's toolbar `serverHelpers` the app uses. */
interface ToolbarServer {
    send(event: string, payload: unknown): void;
    on<T>(event: string, callback: (payload: T) => void): void;
}
declare const _default: {
    init(canvas: ShadowRoot, app: ToolbarApp, server: ToolbarServer): void;
};
export default _default;
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