/**
 * Shared WebSocket plumbing for voice STT/TTS providers. Uses the global
 * `WebSocket` (Node 22+ + browsers) — no `ws` dependency.
 */
export interface VoiceWebSocket {
    send(data: string | ArrayBuffer | Uint8Array): void;
    close(code?: number, reason?: string): void;
    addEventListener(type: 'message', listener: (ev: {
        data: unknown;
    }) => void): void;
    addEventListener(type: 'error', listener: (ev: unknown) => void): void;
    addEventListener(type: 'close', listener: (ev: unknown) => void): void;
    addEventListener(type: 'open', listener: (ev: unknown) => void): void;
    readyState: number;
}
export declare function openVoiceWs(url: string, headers: Record<string, string>): Promise<VoiceWebSocket>;
export declare function toError(value: unknown, fallback: string): Error;
export declare function bytesToBase64(bytes: Uint8Array): string;
export declare function base64ToBytes(value: string): Uint8Array;
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