import fs from 'fs-extra';
import { IAppConfig } from '../../interfaces/index.js';
/**
 * A utility class for interacting with the filesystem. Provides helper methods
 * for storing responses as a JSON file.
 */
export declare class IOUtil {
    private config;
    constructor(config: Required<IAppConfig>);
    getFilePath(filename: string, dateFormat?: string): string;
    /**
     * Writes the given data to the filesystem as a JSON file with a name using
     * the following format: `<Filename>-YYYY.MM.DD-HH.mm.ss.json`
     *
     * It results in a filename like `bills-2022.01.01-12.00.00.json`.
     *
     * @param filename The name of the file to write to.
     * @param data The data to save to the file.
     * @param writeOptions The options to use when writing to the file.
     *
     * @returns A promise that resolves when the file has been saved.
     */
    saveFile(filename: string, data: any, writeOptions?: fs.WriteOptions): Promise<void>;
}
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