import { type HeadersLike } from "./headers.js";
/** Stable User-Agent for REST and Node WebSocket handshakes. */
export declare function getClientUserAgent(): string;
/** Minification-proof client identifier for attribution in Datadog APM. */
export declare function getClientHeader(): string;
/** Headers attached to every outbound Cartesia API request from this SDK. */
export declare function getClientRequestHeaders(): Record<string, string>;
/** Headers for Node WebSocket upgrade requests (TTS + STT). */
export declare function getWebSocketConnectHeaders(authHeaders?: Record<string, string>, extraHeaders?: HeadersLike): Record<string, string>;
/** Browser WebSocket cannot set custom headers; stamp identity via query param. */
export declare function appendBrowserWebSocketClientParam(url: URL): void;
//# sourceMappingURL=client-identity.d.ts.map