/**
 * Converts a file:// URL to a portable path format that can be used with path-module (POSIX-only).
 *
 * This function is designed to work with isomorphic code that uses path-module,
 * which only supports POSIX paths. The key insight is that by stripping the `file://`
 * prefix and normalizing backslashes to forward slashes, we get a path that:
 * - On Unix: `/home/user/file.ts` - works directly with path-module
 * - On Windows: `/C:/Users/file.ts` - also works with path-module because it starts with `/`
 *
 * The resulting path is NOT a valid filesystem path on Windows, but it's a valid
 * POSIX-style path for path manipulation. Use `fileURLToPath` from the `url` module
 * when you need to access the actual filesystem.
 *
 * @param fileUrl - A file:// URL or absolute path (with forward slashes)
 * @returns A portable path starting with `/` that works with path-module
 *
 * @example
 * // Unix file URL
 * fileUrlToPortablePath('file:///home/user/file.ts') // => '/home/user/file.ts'
 *
 * // Windows file URL
 * fileUrlToPortablePath('file:///C:/Users/file.ts') // => '/C:/Users/file.ts'
 *
 * // Already a portable path (passthrough)
 * fileUrlToPortablePath('/home/user/file.ts') // => '/home/user/file.ts'
 */
export declare function fileUrlToPortablePath(fileUrl: string): string;
/**
 * Converts a portable path back to a file:// URL.
 *
 * This is the inverse of `fileUrlToPortablePath`. It takes a portable path
 * (which always starts with `/`) and converts it back to a proper file:// URL.
 *
 * @param portablePath - A portable path starting with `/`
 * @returns A file:// URL
 *
 * @example
 * // Unix path
 * portablePathToFileUrl('/home/user/file.ts') // => 'file:///home/user/file.ts'
 *
 * // Windows path (portable format)
 * portablePathToFileUrl('/C:/Users/file.ts') // => 'file:///C:/Users/file.ts'
 */
export declare function portablePathToFileUrl(portablePath: string): string;