import type { Type } from 'ts-gems';
export declare function isBuiltIn(v: any): boolean;
export declare function isConstructor(fn: any): fn is Type;
export declare function isIterable<T = unknown>(x: any): x is Iterable<T> | IterableIterator<T>;
export declare function isAsyncIterable<T = unknown>(x: any): x is AsyncIterable<T> | AsyncIterableIterator<T>;