Native React Calender Tutorial

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Total beginner here. I’m following the tutorial literally like a zombie just to get a feel for the process. In the Native-React Calendar tutorial, I encountered the following step. Where which file, do I put this piece of code in?

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Start by including all the components and packages that you’ll need:

import React, { Component } from ‘react’;

import {
StyleSheet,
Text,
View,
ScrollView
} from ‘react-native’;

import Icon from ‘react-native-vector-icons/FontAwesome’;
import { range } from ‘lodash’;
import Button from ‘…/components/Button’;

Thanks!