/**
 * iOS audio session category.
 *
 * On iOS the Bluetooth profile follows the page's audio session category, not
 * what the page is actually doing: `play-and-record` puts the headset on the
 * bidirectional HFP/SCO link — mono, narrowband, audibly worse — while
 * `playback` leaves it on A2DP. Safari's default `"auto"` infers the category
 * from capture, but does not reliably hand it back once the capture ends, so a
 * viewer who shared a microphone once keeps listening through the degraded
 * profile for the rest of the page's life. Declaring the category is the only
 * way back onto A2DP.
 *
 * Every other browser leaves `navigator.audioSession` undefined and pays a
 * property read.
 */
export type AudioSessionType = "auto" | "playback" | "transient" | "transient-solo" | "ambient" | "play-and-record";
/**
 * Declare that this document plays audio.
 *
 * Call before creating the `AudioContext`: iOS routes the output when the
 * context is created, so a category set afterwards only takes effect on the
 * next one.
 */
export declare function claimPlaybackAudioSession(): void;
/** Hold the session in a recording-capable category for one live capture. */
export declare function retainRecordingAudioSession(): void;
/** Drop one capture's claim, returning to playback when the last one ends. */
export declare function releaseRecordingAudioSession(): void;
/** Test seam: forget both claims. */
export declare function resetAudioSessionForTests(): void;
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