import { ReferenceObject } from 'openapi3-ts';
import { Verbs } from '../types';
export declare const isReference: (property: unknown) => property is ReferenceObject;
export declare const isDirectory: (path: string) => boolean;
export declare function isObject(x: unknown): x is Record<string, unknown>;
export declare function isString(x: unknown): x is string;
export declare function isNumber(x: unknown): x is number;
export declare function isBoolean(x: unknown): x is boolean;
export declare function isFunction(x: unknown): x is Function;
export declare function isUndefined(x: unknown): x is undefined;
export declare function isNull(x: unknown): x is null;
export declare const isVerb: (verb: string) => verb is Verbs;