/// <reference types="jest" />
export declare type User = {
    firstName: string;
    lastName: string;
};
export declare const USER: User;
export declare const USER_2: User;
export declare const createUser$: (user: User) => import("./atom").Atom<User, {
    setFirstName: (firstName: string) => void;
    set: import("./atom").Set<User>;
}>;
export declare const createEffectSpy: () => {
    effect: (...args: any) => jest.Mock<any, any>;
    spies: {
        effect: jest.Mock<any, any>;
        cleanup: jest.Mock<any, any>;
    };
};