/** Unlock iOS audio during a user gesture. No-op on non-iOS. */
export declare function unlockIosAudioForSession(): void;
/**
 * Listen for the first user interaction on the page and unlock iOS audio in
 * the capture phase, before application click handlers run. Covers callers
 * (such as the convai widget) that `await` before `Conversation.startSession`.
 */
export declare function installIosAudioUnlockListener(): void;
export declare function takeUnlockedAudioContext(): AudioContext | null;
export declare function discardStashedAudioContext(): void;
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