import { EventEmitter } from "events";
import { OpenAICallTrackerCallback } from "../../openai_call_tracker";
export type OpenAICostTrackerJsonEntry = {
    totalCost: number;
};
export type OpenAICostTrackerJsonStorage = {
    spent: Record<string, OpenAICostTrackerJsonEntry>;
    saved: Record<string, OpenAICostTrackerJsonEntry>;
};
export type OpenAICostTrackerJsonBucketWrittenPayload = {
    dateIso: string;
    bucketId: string;
    modelName: string;
    costSpent: number;
    costSaved: number;
};
/**
 * Example of a simple database to store tracked costs from the OpenAICallTracker. It is designed to be used in the openai_cost_tracker_example.ts
 * example, but it can be adapted to be used in other contexts as well. It provides a simple interface to get a tracker callback function
 * that can be passed to the OpenAICallTracker, and it handles the storage of tracked costs in memory and optionally saving/loading them from a file.
 */
export declare class OpenAICostTrackerJson extends EventEmitter {
    static EVENT: {
        BUCKET_WRITTEN: string;
    };
    private _sampleStorage;
    private _filePath?;
    /**
     * Constructor for the OpenAICostTrackerJson class.
     * @param filePath - Optional file path to load/save the tracked costs. If provided, the tracked costs will be loaded from this file
     * on initialization and saved to this file on exit. If not provided, the tracked costs will only be stored in memory and will
     * not persist across sessions.
     */
    constructor(filePath?: string);
    /**
     * async initialisation function
     * - it load the tracked db from the file if the file path is provided
     * - to set up an exit listener to save the tracked db to the file on exit
     */
    init(): Promise<void>;
    close(): Promise<void>;
    saveToFile(): Promise<void>;
    getStorage(): Promise<OpenAICostTrackerJsonStorage>;
    getTrackerCallback(): Promise<OpenAICallTrackerCallback>;
    /**
     * This is an example of a tracker callback function that can be passed to the OpenAICostTracker to track
     * costs in a custom way (e.g. save to a database, send to an analytics service, etc)
     *
     * @param bucketId - an identifier for the tracker, used to group usage information
     * @param response - the response from the OpenAI API, which contains the usage information in the body
     */
    private _trackerCallback;
}