/** The audio output formats `std::speech.speak` supports, and their expected
 *  returned MIME types. Single source of truth — the stdlib speak helper and the
 *  DeterministicClient both import from here rather than each keeping a copy.
 *  Mirrors smoltalk's own `SPEECH_FORMAT_TO_MIME` (not publicly exported). */
export declare const SPEAK_FORMATS: readonly ["mp3", "opus", "aac", "flac", "wav", "pcm"];
export type SpeakFormat = (typeof SPEAK_FORMATS)[number];
export declare const SPEECH_FORMAT_TO_MIME: Record<SpeakFormat, string>;
export declare function isSpeakFormat(value: string): value is SpeakFormat;