type OpenAiCostTrackerFetchInput = string | URL | Request;
type OpenAiCostTrackerFetchInit = RequestInit | undefined;
type OpenAiCostTrackerFetchResponse = Response;
export type OpenAiCostTrackerCallback = (bucketId: string, input: string | URL | Request, init: RequestInit | undefined, response: Response) => Promise<void>;
export declare class OpenAiCostTracker {
    /**
     * This function returns a fetch function that can be passed to the OpenAI client. It is designed to track the usage of OpenAI API calls
     * It is aimed to allow the caller to compute the cost based on the usage information returned in the response.
     *
     * @param bucketId - an identifier for the tracker, used to group usage information (default: 'openai_call_bucket')
     * @param trackerCallback - a callback function that will be called with Response for each API call
     * @param originalFetch - the original fetch function to use for making API calls (default: global fetch)
     * @returns a fetch function that can be passed to the OpenAI client
     */
    static getFetchFn(trackerCallback: OpenAiCostTrackerCallback, { bucketId, originalFetch }?: {
        bucketId?: string;
        originalFetch?: (input: OpenAiCostTrackerFetchInput, init?: OpenAiCostTrackerFetchInit) => Promise<OpenAiCostTrackerFetchResponse>;
    }): Promise<(input: OpenAiCostTrackerFetchInput, init?: OpenAiCostTrackerFetchInit) => Promise<OpenAiCostTrackerFetchResponse>>;
    private static _maybeInjectIncludeUsage;
}
export {};