import { ComponentClass, ReactNode } from 'react';
declare const isNumber: (item: any) => item is boolean;
declare const isBoolean: (item: any) => item is boolean;
declare const isString: (item: any) => item is string;
declare const isPromise: (item: any) => item is Promise<any>;
declare const isArray: (arg: any) => arg is any[];
declare const isUndefined: (item: any) => boolean;
/** 非 undefined */
declare const isNotUndefined: (item: any) => boolean;
declare const isComponentClass: (item: ComponentClass | ReactNode) => item is ComponentClass<{}, any>;
declare const isFunction: (item: any) => item is Function;
export { isNumber, isArray, isBoolean, isString, isPromise, isComponentClass, isUndefined, isNotUndefined, isFunction, };