sample project
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# See https://help.github.com/articles/ignoring-files/ for more about ignoring files.
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# dependencies
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/node_modules
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/.pnp
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.pnp.js
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# testing
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/coverage
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# production
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/build
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# misc
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.DS_Store
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.env.local
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.env.development.local
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.env.test.local
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.env.production.local
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npm-debug.log*
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yarn-debug.log*
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yarn-error.log*
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{
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"name": "sample-react-context",
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"version": "0.1.0",
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"private": true,
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"dependencies": {
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"@testing-library/jest-dom": "^4.2.4",
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"@testing-library/react": "^9.3.2",
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"@testing-library/user-event": "^7.1.2",
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"react": "^16.13.0",
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"react-dom": "^16.13.0",
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"react-scripts": "3.4.0"
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},
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"scripts": {
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"start": "react-scripts start",
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"build": "react-scripts build",
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"test": "react-scripts test",
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"eject": "react-scripts eject"
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},
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"eslintConfig": {
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"extends": "react-app"
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},
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"browserslist": {
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"production": [
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">0.2%",
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"not dead",
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"not op_mini all"
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],
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"development": [
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"last 1 chrome version",
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"last 1 firefox version",
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"last 1 safari version"
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]
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}
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}
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<!DOCTYPE html>
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<html lang="en">
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<head>
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<meta charset="utf-8" />
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<title>React App</title>
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</head>
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<body>
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<noscript>You need to enable JavaScript to run this app.</noscript>
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<div id="root"></div>
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</body>
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</html>
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import React, { useContext } from 'react';
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import Context from './Context';
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import Home from './Home';
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function App() {
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const { page } = useContext(Context)
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return (
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<>
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<h1>Title: {page.title}</h1>
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<Home />
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</>
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);
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}
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export default App;
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import React from 'react'
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import App from './App'
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import Context from './Context'
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function AppWrapper() {
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return (
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<Context.Provider value={{page: {}}}>
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<App />
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</Context.Provider>
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)
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}
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export default AppWrapper
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import React from 'react'
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const Context = React.createContext({})
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export default Context
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import React, { useContext } from 'react'
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import Context from './Context'
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function Home () {
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const { page } = useContext(Context)
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page.title = 'Home'
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return (
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<p>Hello, World!</p>
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)
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}
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export default Home
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import React from 'react';
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import ReactDOM from 'react-dom';
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import AppWrapper from './AppWrapper';
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import * as serviceWorker from './serviceWorker';
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ReactDOM.render(<AppWrapper />, document.getElementById('root'));
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// If you want your app to work offline and load faster, you can change
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// unregister() to register() below. Note this comes with some pitfalls.
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// Learn more about service workers: https://bit.ly/CRA-PWA
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serviceWorker.unregister();
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// This optional code is used to register a service worker.
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// register() is not called by default.
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// This lets the app load faster on subsequent visits in production, and gives
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// it offline capabilities. However, it also means that developers (and users)
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// will only see deployed updates on subsequent visits to a page, after all the
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// existing tabs open on the page have been closed, since previously cached
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// resources are updated in the background.
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// To learn more about the benefits of this model and instructions on how to
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// opt-in, read https://bit.ly/CRA-PWA
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const isLocalhost = Boolean(
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window.location.hostname === 'localhost' ||
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// [::1] is the IPv6 localhost address.
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window.location.hostname === '[::1]' ||
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// 127.0.0.0/8 are considered localhost for IPv4.
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window.location.hostname.match(
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/^127(?:\.(?:25[0-5]|2[0-4][0-9]|[01]?[0-9][0-9]?)){3}$/
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)
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);
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export function register(config) {
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if (process.env.NODE_ENV === 'production' && 'serviceWorker' in navigator) {
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// The URL constructor is available in all browsers that support SW.
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const publicUrl = new URL(process.env.PUBLIC_URL, window.location.href);
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if (publicUrl.origin !== window.location.origin) {
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// Our service worker won't work if PUBLIC_URL is on a different origin
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// from what our page is served on. This might happen if a CDN is used to
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// serve assets; see https://github.com/facebook/create-react-app/issues/2374
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return;
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}
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window.addEventListener('load', () => {
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const swUrl = `${process.env.PUBLIC_URL}/service-worker.js`;
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if (isLocalhost) {
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// This is running on localhost. Let's check if a service worker still exists or not.
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checkValidServiceWorker(swUrl, config);
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// Add some additional logging to localhost, pointing developers to the
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// service worker/PWA documentation.
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navigator.serviceWorker.ready.then(() => {
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console.log(
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'This web app is being served cache-first by a service ' +
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'worker. To learn more, visit https://bit.ly/CRA-PWA'
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);
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});
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} else {
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// Is not localhost. Just register service worker
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registerValidSW(swUrl, config);
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}
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});
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}
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}
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function registerValidSW(swUrl, config) {
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navigator.serviceWorker
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.register(swUrl)
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.then(registration => {
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registration.onupdatefound = () => {
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const installingWorker = registration.installing;
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if (installingWorker == null) {
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return;
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}
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installingWorker.onstatechange = () => {
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if (installingWorker.state === 'installed') {
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if (navigator.serviceWorker.controller) {
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// At this point, the updated precached content has been fetched,
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// but the previous service worker will still serve the older
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// content until all client tabs are closed.
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console.log(
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'New content is available and will be used when all ' +
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'tabs for this page are closed. See https://bit.ly/CRA-PWA.'
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);
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// Execute callback
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if (config && config.onUpdate) {
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config.onUpdate(registration);
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}
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} else {
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// At this point, everything has been precached.
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// It's the perfect time to display a
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// "Content is cached for offline use." message.
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console.log('Content is cached for offline use.');
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// Execute callback
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if (config && config.onSuccess) {
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config.onSuccess(registration);
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}
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}
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}
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};
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};
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})
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.catch(error => {
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console.error('Error during service worker registration:', error);
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});
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}
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function checkValidServiceWorker(swUrl, config) {
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// Check if the service worker can be found. If it can't reload the page.
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fetch(swUrl, {
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headers: { 'Service-Worker': 'script' }
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})
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.then(response => {
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// Ensure service worker exists, and that we really are getting a JS file.
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const contentType = response.headers.get('content-type');
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if (
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response.status === 404 ||
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(contentType != null && contentType.indexOf('javascript') === -1)
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) {
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// No service worker found. Probably a different app. Reload the page.
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navigator.serviceWorker.ready.then(registration => {
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registration.unregister().then(() => {
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window.location.reload();
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});
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});
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} else {
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// Service worker found. Proceed as normal.
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registerValidSW(swUrl, config);
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}
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})
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.catch(() => {
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console.log(
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'No internet connection found. App is running in offline mode.'
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);
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});
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}
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export function unregister() {
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if ('serviceWorker' in navigator) {
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navigator.serviceWorker.ready
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.then(registration => {
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registration.unregister();
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})
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.catch(error => {
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console.error(error.message);
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});
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}
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}
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