import { AssistantPreviewController } from './types';
/** The controller an `AssistantPreviewBridgeHost` above bridges, or null. */
export declare const HostedPreviewBridgeContext: import('react').Context<AssistantPreviewController | null>;
/**
 * The controller an ancestor already runs the bridge for, or null when none
 * does.
 */
export declare function useHostedAssistantPreviewBridge(): AssistantPreviewController | null;
/**
 * The controller the PANEL should run its own bridge for: its `preview`, unless
 * a host above it already runs the bridge for that very controller.
 *
 * ★ Identity, not presence. A host bridging controller A says nothing about a
 * panel handed controller B; B still needs a bridge, and only the panel has it.
 */
export declare function panelOwnedPreviewBridge(preview: AssistantPreviewController | null | undefined, hosted: AssistantPreviewController | null): AssistantPreviewController | null;
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