/**
 * Message protocol between {@link TextToSpeech} and the TTS Web Worker.
 *
 * The worker owns the WASM synthesizer so {@link TextToSpeech.say} can run
 * synthesis off the main thread. Sync {@link TextToSpeech.synthesize} stays on
 * the main thread and is out of scope here.
 */
export type TtsWorkerRequest = {
    type: 'setEngine';
    id: number;
    language: string;
    keys: string[];
    /** Parallel to keys; structured-cloned (not transferred) so the host keeps a copy. */
    buffers: Uint8Array[];
    optionNames: string[];
    optionValues: string[];
    /** Base URL for moonshine.wasm / pthread workers, ending with `/`. */
    wasmBaseUrl: string;
} | {
    type: 'synthesize';
    id: number;
    text: string;
} | {
    type: 'close';
    id: number;
};
export type TtsWorkerResponse = {
    type: 'ok';
    id: number;
} | {
    type: 'synthesized';
    id: number;
    sampleRate: number;
    /** Detached ArrayBuffer of Float32 PCM; transferred from the worker. */
    audioBuffer: ArrayBuffer;
} | {
    type: 'error';
    id: number;
    message: string;
};
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