https://www.youtube.com/watch?v=fq02r-M-D8I // Redux Ty stara kurwo zmarnowałaś mi 20 lat życia

__LoginPage.js

class LoginPage extends Component {
    test() {
        this.props.setLoginState(SignInState.SIGNED_IN)
    }

    render() {
      //... wywołuję test() po naciśnięciu przycisku
    }
}

const mapDispatchToProps = (dispatch) => {
    return (bindActionCreators({
        setLoginState: setLoginState
    }, dispatch));
};

export default connect(null, mapDispatchToProps)(LoginPage);

_Navigation.js

class Navigation extends Component {

    render() {
        
        //tutaj chcę odebrać informację
        console.debug(this.props.myProp);
      //....
    }
}

const mapStateToProps = (state) => {
    return ({myProp: state.signIn});

};

export default connect(mapStateToProps)(Navigation);

actions.js

import {LOGIN} from '../actionTypes'

export function setLoginState(signState) {
    return {type: LOGIN, signState}
}

actionTypes.js

export const LOGIN = 'LOGIN'
export const LOGOUT = 'LOGOUT'

reducer.js

import {SignInState} from '../states';
import {LOGIN, LOGOUT} from '../actionTypes';

const initialState = {
    signIn: SignInState.SIGNED_OUT
}

export default function login(state = initialState, action) {
    switch (action.type) {
        case LOGIN:
            return {signIn: SignInState.SIGNED_IN};
        case LOGOUT:
            return {signIn: SignInState.SIGNED_OUT};
        default:
            return state;
    }
}

states.js

export const SignInState = {
    SIGNED_IN: 'SIGNED_IN',
    SIGNED_OUT: 'SIGNED_OUT'
}