import type { Property } from '../proxy';
import type { TypeMatcher } from './matcher';
type ObjectType = Record<Property, unknown>;
/**
 * Matches any plain object e.g. object literals or objects created with `Object.create()`.
 *
 * Classes, arrays, maps, sets etc. are not considered plain objects.
 * You can use {@link containsObject} or {@link matches} to match those.
 *
 * @example
 * const fn = mock<({ foo: string }) => number>();
 * when(() => fn(It.isPlainObject())).thenReturn(42);
 *
 * fn({ foo: 'bar' }) // returns 42
 */
export declare const isPlainObject: <T extends ObjectType>() => TypeMatcher<T>;
export {};