import type { BackendExplanation, MediaSessionAction, MediaSessionActionDetails, MediaSessionBackend, MediaSessionMetadata, MediaSessionPlaybackState, MediaSessionPositionState } from '@flighthq/types/contract';
export declare function clearMediaSessionActionHandler(action: MediaSessionAction): void;
export declare function clearMediaSessionMetadata(): void;
export declare function clearMediaSessionPositionState(): void;
export declare function createWebMediaSessionBackend(): MediaSessionBackend;
export declare function explainMediaSessionBackend(): BackendExplanation;
export declare function getMediaSessionBackend(): MediaSessionBackend;
export declare function installMediaSessionHostBackend(backend: MediaSessionBackend): void;
export declare function observeMediaSessionHostResult(operation: string, succeeded: boolean): void;
export declare function resetMediaSessionBackendForTest(): void;
export declare function setMediaSessionActionHandler(action: MediaSessionAction, handler: (details: Readonly<MediaSessionActionDetails>) => void): void;
export declare function setMediaSessionBackend(backend: MediaSessionBackend | null): void;
export declare function setMediaSessionMetadata(metadata: Readonly<MediaSessionMetadata>): void;
export declare function setMediaSessionPlaybackState(state: MediaSessionPlaybackState): void;
export declare function setMediaSessionPositionState(state: Readonly<MediaSessionPositionState>): void;
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