export declare const SPEECH_NO_TEXT_ERROR = "No speech detected. Please try again.";
export declare const SPEECH_RATE_LIMIT_ERROR = "Too many requests. Please wait a moment and try again.";
export declare const SPEECH_TRANSCRIBE_FAILED_ERROR = "Failed to transcribe audio. Please try again.";
export type SpeechToTextFile = {
    uri: string;
    mimeType?: string;
    name?: string;
};
export declare function transcribeAudio({ authToken, baseUrl, file, headers, }: {
    authToken: string;
    baseUrl: string;
    file: SpeechToTextFile;
    headers?: Record<string, string>;
}): Promise<string>;
/** Elapsed-recording label for the dictation bar, e.g. 0:07, 1:32. */
export declare function formatRecordingDuration(totalSeconds: number): string;
/**
 * Fast-attack / slow-decay envelope for waveform levels: a loud sample snaps the
 * display up immediately, silence lets it fall off gradually — the standard
 * metering ballistics that keep a voice waveform from flickering.
 */
export declare function smoothLevel(previousDisplay: number, sample: number, decay?: number): number;
/** Map a 0..1 level onto a waveform bar height in px. */
export declare function levelToWaveHeight(level: number, minHeight: number, maxHeight: number): number;
/**
 * Synthetic mic-level source for hosts whose recorder can't meter (and the web
 * demo without mic permission): a bounded random walk with occasional speech-like
 * bursts, so the waveform still reads as alive. `random` is injectable for tests.
 */
export declare function createSyntheticLevelSource(random?: () => number): () => number;
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