import type { BenchmarkReport, SuiteReport } from '../types.js';
import { Reporter } from './reporter.js';
/**
 * Options for configuring the FileReporter.
 */
export interface FileReporterOptions {
    /**
     * The directory where the benchmark report file will be saved.
     * @default './' (current directory)
     */
    outputDir?: string;
    /**
     * A pattern for generating the file name.
     * The pattern can include the `%timestamp%` placeholder, which will be replaced with the current timestamp.
     * @default '%timestamp%_benchmark.json'
     * @example 'benchmark_results_%timestamp%.json'
     * @example 'my_report.json'
     */
    fileNamePattern?: string;
    /**
     * The filesystem module to use for file operations.
     * This is primarily used for testing purposes. However, it can also be used to
     * provide a custom implementation of the filesystem module (in a browser, for example).
     * @default 'fs/promises'
     */
    fs?: {
        mkdir: (path: string, options: {
            recursive: boolean;
        }) => Promise<void>;
        writeFile: (path: string, data: string, encoding: string) => Promise<void>;
    };
    /**
     * The path module to use for path operations.
     * This is primarily used for testing purposes. However, it can also be used to
     * provide a custom implementation of the path module (in a browser, for example).
     * @default 'path'
     */
    path?: {
        join: (...paths: string[]) => string;
    };
}
/**
 * A reporter that saves benchmark reports to a JSON file.
 * It supports a configurable output directory and file name pattern.
 */
export declare class FileReporter extends Reporter {
    protected options: FileReporterOptions;
    constructor(options?: FileReporterOptions);
    /**
     * Saves the benchmark report to a JSON file.
     *
     * @example
     * ```typescript
     * const fileReporter = new FileReporter({
     *   outputDir: './my-reports',
     *   fileNamePattern: 'benchmark_results_%timestamp%.json',
     * });
     * await fileReporter.run(report);
     * ```
     */
    run(report: BenchmarkReport | SuiteReport): Promise<void>;
}
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