import { record } from '../record';
export type IsUndefined<T> = [T] extends [undefined] ? [undefined] extends [T] ? true : false : false;
export declare const isObject: <T extends record.Unknown = record.Unknown>(item?: unknown) => item is T;
/**
 * A stricter version of {@link isObject} that additionally rejects class instances,
 * arrays, and any non-`Object.prototype` objects. Returns true only for plain objects
 * created via `{}`, `Object.create(null)`, or an object literal.
 *
 * Useful for walkers that need to distinguish "plain data bag" from "wrapped instance"
 * (e.g. `Date`, `Map`, `Error`), which `isObject` treats the same.
 */
export declare const isPlainObject: (item?: unknown) => item is Record<string, unknown>;
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