import { RequestHandler } from 'express';
import { RouteErrorHandler, ExpressMethod } from '../types/routing.js';

declare const VALID_OUTPUT_TYPES: readonly ["tree", "table", "json"];
declare function isFunction(value: any): value is Function;
declare function isRequestHandler(handler: any): handler is RequestHandler;
declare function isErrorHandler(handler: any): handler is RouteErrorHandler;
declare function filenameIsJSorTS(filename: string): boolean;
declare function pathExistsAndIsFile(path: string): boolean;
declare function fileExistsAndIsJSorTS(filePath: string): boolean;
declare function methodIsExpressMethod(method: string): method is ExpressMethod;
declare function isDefined<T>(value: T): value is NonNullable<T>;
declare function isNotDefined<T>(value: T): value is Extract<T, null | undefined>;
declare function isObject(value: unknown): value is object;
declare function validateCLIList<T extends string = string>(value: string | undefined, allowed: T[] | Readonly<T[]>, name: string): T[];
declare function normalizeCLIOptions(options: Record<string, any>): {
    target: string;
    output: (typeof VALID_OUTPUT_TYPES)[number];
};

export { fileExistsAndIsJSorTS, filenameIsJSorTS, isDefined, isErrorHandler, isFunction, isNotDefined, isObject, isRequestHandler, methodIsExpressMethod, normalizeCLIOptions, pathExistsAndIsFile, validateCLIList };