/// <reference types="node" />
export type StreamMode = "raw" | "tokens";
export interface OpenAIStreamOptions {
    /**
     * Whether to return tokens or raw events.
     */
    mode?: StreamMode;
    /**
     * A function to run at the end of a stream. This is useful if you want
     * to do something with the stream after it's done, like log token usage.
     */
    onDone?: () => void | Promise<void>;
    /**
     * A function that runs for each token. This is useful if you want
     * to sum tokens used as they're returned.
     */
    onParse?: (token: string) => void | Promise<void>;
}
export type OpenAIStream = (stream: NodeJS.ReadableStream | ReadableStream<Uint8Array>, options: OpenAIStreamOptions) => ReadableStream<Uint8Array>;
/**
 * A `ReadableStream` of server sent events from the given OpenAI API stream.
 *
 * @note This can't be done via a generator while using `createParser` because
 * there is no way to yield from within the callback.
 */
export declare const EventStream: OpenAIStream;
/**
 * A `ReadableStream` of parsed tokens from the given OpenAI API stream.
 */
export declare const TokenStream: OpenAIStream;
/**
 * A `ReadableStream` of parsed deltas from the given ChatGPT stream.
 */
export declare const ChatStream: OpenAIStream;