export interface CreateOpenAIWebSocketFetchOptions {
    /**
     * WebSocket endpoint URL.
     * @default 'wss://api.openai.com/v1/responses'
     */
    url?: string;
    /**
     * Additional headers sent when establishing the WebSocket connection.
     * Authorization and OpenAI-Beta are managed internally.
     */
    headers?: Record<string, string>;
}
export type OpenAIWebSocketFetch = ((input: RequestInfo | URL, init?: RequestInit) => Promise<Response>) & {
    close(): void;
};
/**
 * Creates a `fetch` function that routes OpenAI Responses API streaming
 * requests through a persistent WebSocket connection instead of HTTP.
 */
export declare function createOpenAIWebSocketFetch(options?: CreateOpenAIWebSocketFetchOptions): OpenAIWebSocketFetch;
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