export interface VoiceModelDownloadOptions {
    /** The URL to fetch the model from. */
    readonly url: string;
    /** The final on-disk path (e.g. .../en_US-glados-high.onnx). */
    readonly destPath: string;
    /** Injectable fetch (real fetch by default; tests pass a mock). */
    readonly fetchImpl?: typeof fetch | undefined;
    /** Reject downloads smaller than this many bytes (default 4096). */
    readonly minBytes?: number | undefined;
    /** Abort the download after this many ms (default 120000). */
    readonly timeoutMs?: number | undefined;
    /**
     * Verify the ONNX protobuf magic (first byte 0x08, the ir_version field tag).
     * Defaults to true when destPath ends in `.onnx`. Set false for `.json` configs.
     */
    readonly expectOnnxMagic?: boolean | undefined;
}
export type VoiceModelDownloadResult = {
    readonly ok: true;
    readonly path: string;
    readonly bytes: number;
} | {
    readonly ok: false;
    readonly error: string;
};
/**
 * Download a voice model atomically with verification. Never leaves a partial
 * file at `destPath`; returns a structured result rather than throwing.
 */
export declare function downloadVoiceModel(options: VoiceModelDownloadOptions): Promise<VoiceModelDownloadResult>;
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