/**
 * Initialize synchronous file system module (Node.js only)
 * Uses dynamic import to prevent bundling in browser builds
 */
export declare function initFileSystem(): Promise<void>;
/**
 * Get system temporary directory (Node.js only)
 * @returns Temporary directory path with trailing slash, or undefined
 */
export declare function getTempDir(): string | undefined;
/**
 * Read file contents synchronously (Node.js only)
 * @param path File path to read
 * @param encoding File encoding (default: 'utf8')
 * @returns File contents as string, or undefined in browser
 */
export declare function readFile(path: string, encoding?: BufferEncoding | null): string | undefined | Buffer;
/**
 * Write file contents synchronously (Node.js only)
 * @param path File path to write
 * @param data Data to write
 * @param encoding File encoding (default: 'utf8')
 */
export declare function writeFile(path: string, data: string, encoding?: BufferEncoding): boolean;
/**
 * Check if file exists synchronously (Node.js only)
 * @param path File path to check
 * @returns true if file exists, false otherwise
 */
export declare function existsFile(path: string): boolean;
/**
 * Convert file-path to file-url format on Windows, to avoid ESM loader error when using absolute paths, like:
 * Error [ERR_UNSUPPORTED_ESM_URL_SCHEME]: Only URLs with a scheme in: file, data, and node are supported by the default ESM loader. On Windows, absolute paths must be valid file:// URLs. Received protocol 'd:' at throwIfUnsupportedURLScheme (node:internal/modules/esm/load:195:11)
 * @param filePath File path to check
 * @returns filepath original or converted to file URL format on Windows
 */
export declare function filePathToFileUrlForWindows(filePath: string): string;