/**
 * Converts a URL to a local file path.
 * @param url - The URL to convert
 * @param extension - The file extension to add (with leading dot, e.g., '.html')
 * @returns The local file path (without leading slash)
 * @example
 * ```ts
 * urlToLocalPath('https://example.com/', '.html') // 'index.html'
 * urlToLocalPath('https://example.com/path/', '.html') // 'path/index.html'
 * urlToLocalPath('https://example.com/file', '.html') // 'file.html'
 * urlToLocalPath('https://example.com/file.js', '') // 'file.js'
 * ```
 */
export declare function urlToLocalPath(url: string, extension: string): string;