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I'm trying to create a multi step registration form using React and Redux.

The main component is as follows :

import React, {PropTypes} from 'react';
import {connect} from 'react-redux';
import {bindActionCreators} from 'redux';
import * as actionCreators from '../../actions/actionCreators';
import countries from '../../data/countries';

import RegistrationFormStepOne from './registrationFormStepOne';
import RegistrationFormStepTwo from './registrationFormStepTwo';
import RegistrationFormStepThree from './registrationFormStepThree';
import RegistrationFormStepFour from './registrationFormStepFour';

class RegistrationPage extends React.Component {
    constructor(props) {
        super(props);

        this.state = {
            user: Object.assign({}, this.props.userData),
            fileNames: {},
            selectedFile: {},
            icons: {
                idCard: …