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BOOTSTRAP
No Lock-In. Under the hood, we use webpack, Babel, ESLint, and other amazing projects to power your app. If you ever want an advanced configuration, you can ”eject” from Create React App and edit their config files directly.RUNNING TESTS
Note: this feature is available with and higher.. Read the migration guide to learn how to enable it in older projects! Create React App uses Jest as its test runner. To prepare for this integration, we did a major revamp of Jest so if you heard bad things about it years ago, give it another try.. Jest is a Node-based runner. USING HTTPS IN DEVELOPMENT Note: this feature is available with and higher.. You may require the dev server to serve pages over HTTPS. One particular case where this could be useful is when using the "proxy" feature to proxy requests to an API server when that API server is itself serving HTTPS.. To do this, set the HTTPS environment variable to true, then start the dev server as usual with npm start: MAKING A PROGRESSIVE WEB APP IMPORTING A COMPONENT This project setup supports ES6 modules thanks to webpack. While you can still use require() and module.exports, we encourage you to useimport and
ADDING A ROUTER
To try it, delete all the code in src/App.js and replace it with any of the examples on its website. The Basic Example is a good place to get started.. Note that you may need to configure your production server to support client-side routing before deploying your app. PROXYING API REQUESTS IN DEVELOPMENT Such setup is not required. However, if you do have a setup like this, it is convenient to write requests like fetch('/api/todos') without worrying about redirecting them to another host or port during development.. To tell the development server to proxy any unknown requests to your API server in development, add a proxy field to your package.json, for example: ADDING CUSTOM ENVIRONMENT VARIABLES Note: You must create custom environment variables beginning with REACT_APP_.Any other variables except NODE_ENV will be ignored to avoid accidentally exposing a private key on the machine that could have the same name.Changing any environment variables will require you to restart the development server if it is running. CREATE-REACT-APP.DEV 301 Moved Permanently. nginx ADDING A SASS STYLESHEET Note: You must prefix imports from node_modules with ~ as displayed above. node-sass also supports the SASS_PATH variable.. To use imports relative to a path you specify, and from node_modules without adding the ~ prefix, you can add a .env file at the project root with the variable SASS_PATH=node_modules:src.To specify more directories you can add them to SASS_PATH CREATE REACT APPCREATE REACT APPGETTING STARTEDADDING TYPESCRIPTADDINGBOOTSTRAP
No Lock-In. Under the hood, we use webpack, Babel, ESLint, and other amazing projects to power your app. If you ever want an advanced configuration, you can ”eject” from Create React App and edit their config files directly.RUNNING TESTS
Note: this feature is available with and higher.. Read the migration guide to learn how to enable it in older projects! Create React App uses Jest as its test runner. To prepare for this integration, we did a major revamp of Jest so if you heard bad things about it years ago, give it another try.. Jest is a Node-based runner. USING HTTPS IN DEVELOPMENT Note: this feature is available with and higher.. You may require the dev server to serve pages over HTTPS. One particular case where this could be useful is when using the "proxy" feature to proxy requests to an API server when that API server is itself serving HTTPS.. To do this, set the HTTPS environment variable to true, then start the dev server as usual with npm start: MAKING A PROGRESSIVE WEB APP IMPORTING A COMPONENT This project setup supports ES6 modules thanks to webpack. While you can still use require() and module.exports, we encourage you to useimport and
ADDING A ROUTER
To try it, delete all the code in src/App.js and replace it with any of the examples on its website. The Basic Example is a good place to get started.. Note that you may need to configure your production server to support client-side routing before deploying your app. PROXYING API REQUESTS IN DEVELOPMENT Such setup is not required. However, if you do have a setup like this, it is convenient to write requests like fetch('/api/todos') without worrying about redirecting them to another host or port during development.. To tell the development server to proxy any unknown requests to your API server in development, add a proxy field to your package.json, for example: ADDING CUSTOM ENVIRONMENT VARIABLES Note: You must create custom environment variables beginning with REACT_APP_.Any other variables except NODE_ENV will be ignored to avoid accidentally exposing a private key on the machine that could have the same name.Changing any environment variables will require you to restart the development server if it is running. CREATE-REACT-APP.DEV 301 Moved Permanently. nginx ADDING A SASS STYLESHEET Note: You must prefix imports from node_modules with ~ as displayed above. node-sass also supports the SASS_PATH variable.. To use imports relative to a path you specify, and from node_modules without adding the ~ prefix, you can add a .env file at the project root with the variable SASS_PATH=node_modules:src.To specify more directories you can add them to SASS_PATH ADVANCED CONFIGURATION You can adjust various development and production settings by setting environment variables in your shell or with .env.. Note: You do not need to declare REACT_APP_ before the below variables as you would with custom environment variables. MAKING A PROGRESSIVE WEB APP The production build has all the tools necessary to generate a first-class Progressive Web App, but the offline/cache-first behavior is opt-in only. Starting with Create React App 4, you can add a src/service-worker.js file to your project to use the built-in support for Workbox's InjectManifest plugin, which will compile your service worker and inject into it a list of URLs to precache. CREATING A PRODUCTION BUILD npm run build creates a build directory with a production build of your app. Inside the build/static directory will be your JavaScript and CSS files. Each filename inside of build/static will contain a unique hash of the file contents. This hash in the file name enables long term caching techniques.. When running a production build of freshly created Create React App application, there are a IMPORTING A COMPONENT This project setup supports ES6 modules thanks to webpack. While you can still use require() and module.exports, we encourage you to useimport and
UPDATING TO NEW RELEASES Create React App is divided into two packages: create-react-app is a global command-line utility that you use to create new projects.; react-scripts is a development dependency in the generated projects (including this one).; When you run npx create-react-app my-app it automatically installs the latest version of Create React App. . If you've previously installed create-react-app globally via DEPLOYMENT | CREATE REACT APP npm run build creates a build directory with a production build of your app. Set up your favorite HTTP server so that a visitor to your site is served index.html, and requests to static paths like /static/js/main..js are served with the contents of the /static/js/main..js file.ADDING A ROUTER
To try it, delete all the code in src/App.js and replace it with any of the examples on its website. The Basic Example is a good place to get started.. Note that you may need to configure your production server to support client-side routing before deploying your app. ADDING IMAGES, FONTS, AND FILES This is handy if you don't want to load SVG as a separate file. Don't forget the curly braces in the import! The ReactComponent import name is significant and tells Create React App that you want a React component that renders an SVG, rather than its filename.. Tip: The imported SVG React Component accepts a title prop along with other props that a svg element accepts. PROXYING API REQUESTS IN DEVELOPMENT Such setup is not required. However, if you do have a setup like this, it is convenient to write requests like fetch('/api/todos') without worrying about redirecting them to another host or port during development.. To tell the development server to proxy any unknown requests to your API server in development, add a proxy field to your package.json, for example: ADDING A SASS STYLESHEET Note: You must prefix imports from node_modules with ~ as displayed above. node-sass also supports the SASS_PATH variable.. To use imports relative to a path you specify, and from node_modules without adding the ~ prefix, you can add a .env file at the project root with the variable SASS_PATH=node_modules:src.To specify more directories you can add them to SASS_PATH CREATE REACT APPCREATE REACT APPGETTING STARTEDADDING TYPESCRIPTADDINGBOOTSTRAP
Get started in seconds. Whether you’re using React or another library, Create React App lets you focus on code, not build tools. To create a project called my-app, runRUNNING TESTS
Note: this feature is available with and higher.. Read the migration guide to learn how to enable it in older projects! Create React App uses Jest as its test runner. To prepare for this integration, we did a major revamp of Jest so if you heard bad things about it years ago, give it another try.. Jest is a Node-based runner. USING HTTPS IN DEVELOPMENT Note: this feature is available with and higher.. You may require the dev server to serve pages over HTTPS. One particular case where this could be useful is when using the "proxy" feature to proxy requests to an API server when that API server is itself serving HTTPS.. To do this, set the HTTPS environment variable to true, then start the dev server as usual with npm start: MAKING A PROGRESSIVE WEB APP IMPORTING A COMPONENT This project setup supports ES6 modules thanks to webpack. While you can still use require() and module.exports, we encourage you to useimport and
ADDING A ROUTER
To add it, run: Copy. npm install --save react-router-dom. Alternatively you may use yarn: Copy. yarn add react-router-dom. To try it, delete all the code in src/App.js and replace it with any of the examples on its website. The Basic Example is a good place to getstarted.
MEASURING PERFORMANCE Measuring Performance. By default, Create React App includes a performance relayer that allows you to measure and analyze the performance of your application using different metrics. To measure any of the supported metrics, you only need to pass a function into the reportWebVitals function in index.js: This function is fired whenthe final
ADDING CUSTOM ENVIRONMENT VARIABLES Note: You must create custom environment variables beginning with REACT_APP_.Any other variables except NODE_ENV will be ignored to avoid accidentally exposing a private key on the machine that could have the same name.Changing any environment variables will require you to restart the development server if it is running. PROXYING API REQUESTS IN DEVELOPMENT Such setup is not required. However, if you do have a setup like this, it is convenient to write requests like fetch('/api/todos') without worrying about redirecting them to another host or port during development.. To tell the development server to proxy any unknown requests to your API server in development, add a proxy field to your package.json, for example: CREATE-REACT-APP.DEV 301 Moved Permanently. nginx CREATE REACT APPCREATE REACT APPGETTING STARTEDADDING TYPESCRIPTADDINGBOOTSTRAP
Get started in seconds. Whether you’re using React or another library, Create React App lets you focus on code, not build tools. To create a project called my-app, runRUNNING TESTS
Note: this feature is available with and higher.. Read the migration guide to learn how to enable it in older projects! Create React App uses Jest as its test runner. To prepare for this integration, we did a major revamp of Jest so if you heard bad things about it years ago, give it another try.. Jest is a Node-based runner. USING HTTPS IN DEVELOPMENT Note: this feature is available with and higher.. You may require the dev server to serve pages over HTTPS. One particular case where this could be useful is when using the "proxy" feature to proxy requests to an API server when that API server is itself serving HTTPS.. To do this, set the HTTPS environment variable to true, then start the dev server as usual with npm start: MAKING A PROGRESSIVE WEB APP IMPORTING A COMPONENT This project setup supports ES6 modules thanks to webpack. While you can still use require() and module.exports, we encourage you to useimport and
ADDING A ROUTER
To add it, run: Copy. npm install --save react-router-dom. Alternatively you may use yarn: Copy. yarn add react-router-dom. To try it, delete all the code in src/App.js and replace it with any of the examples on its website. The Basic Example is a good place to getstarted.
MEASURING PERFORMANCE Measuring Performance. By default, Create React App includes a performance relayer that allows you to measure and analyze the performance of your application using different metrics. To measure any of the supported metrics, you only need to pass a function into the reportWebVitals function in index.js: This function is fired whenthe final
ADDING CUSTOM ENVIRONMENT VARIABLES Note: You must create custom environment variables beginning with REACT_APP_.Any other variables except NODE_ENV will be ignored to avoid accidentally exposing a private key on the machine that could have the same name.Changing any environment variables will require you to restart the development server if it is running. PROXYING API REQUESTS IN DEVELOPMENT Such setup is not required. However, if you do have a setup like this, it is convenient to write requests like fetch('/api/todos') without worrying about redirecting them to another host or port during development.. To tell the development server to proxy any unknown requests to your API server in development, add a proxy field to your package.json, for example: CREATE-REACT-APP.DEV 301 Moved Permanently. nginx ADVANCED CONFIGURATION By default, Create React App will open the default system browser, favoring Chrome on macOS. Specify a browser to override this behavior, or set it to none to disable it completely. If you need to customize the way the browser is launched, you can specify a node script instead. Any arguments passed to npm start will also be passed to this MAKING A PROGRESSIVE WEB APP The production build has all the tools necessary to generate a first-class Progressive Web App, but the offline/cache-first behavior is opt-in only. Starting with Create React App 4, you can add a src/service-worker.js file to your project to use the built-in support for Workbox's InjectManifest plugin, which will compile your service worker and inject into it a list of URLs to precache. CREATING A PRODUCTION BUILD npm run build creates a build directory with a production build of your app. Inside the build/static directory will be your JavaScript and CSS files. Each filename inside of build/static will contain a unique hash of the file contents. This hash in the file name enables long term caching techniques.. When running a production build of freshly created Create React App application, there are a IMPORTING A COMPONENT This project setup supports ES6 modules thanks to webpack. While you can still use require() and module.exports, we encourage you to useimport and
DEPLOYMENT | CREATE REACT APP npm run build creates a build directory with a production build of your app. Set up your favorite HTTP server so that a visitor to your site is served index.html, and requests to static paths like /static/js/main..js are served with the contents of the /static/js/main..js file.ADDING A ROUTER
To add it, run: Copy. npm install --save react-router-dom. Alternatively you may use yarn: Copy. yarn add react-router-dom. To try it, delete all the code in src/App.js and replace it with any of the examples on its website. The Basic Example is a good place to getstarted.
ADDING IMAGES, FONTS, AND FILES This is handy if you don't want to load SVG as a separate file. Don't forget the curly braces in the import! The ReactComponent import name is significant and tells Create React App that you want a React component that renders an SVG, rather than its filename.. Tip: The imported SVG React Component accepts a title prop along with other props that a svg element accepts. PROXYING API REQUESTS IN DEVELOPMENT Such setup is not required. However, if you do have a setup like this, it is convenient to write requests like fetch('/api/todos') without worrying about redirecting them to another host or port during development.. To tell the development server to proxy any unknown requests to your API server in development, add a proxy field to your package.json, for example: UPDATING TO NEW RELEASES Updating to New Releases. Create React App is divided into two packages: create-react-app is a global command-line utility that you use to create new projects. react-scripts is a development dependency in the generated projects (including this one). When you run npx create-react-app my-app it automatically installs the latest versionof Create
ADDING A SASS STYLESHEET Note: You must prefix imports from node_modules with ~ as displayed above. node-sass also supports the SASS_PATH variable.. To use imports relative to a path you specify, and from node_modules without adding the ~ prefix, you can add a .env file at the project root with the variable SASS_PATH=node_modules:src.To specify more directories you can add them to SASS_PATH CREATE REACT APPCREATE REACT APPGETTING STARTEDADDING TYPESCRIPTADDINGBOOTSTRAP
Get started in seconds. Whether you’re using React or another library, Create React App lets you focus on code, not build tools. To create a project called my-app, runRUNNING TESTS
Note: this feature is available with and higher.. Read the migration guide to learn how to enable it in older projects! Create React App uses Jest as its test runner. To prepare for this integration, we did a major revamp of Jest so if you heard bad things about it years ago, give it another try.. Jest is a Node-based runner. MEASURING PERFORMANCE Measuring Performance. By default, Create React App includes a performance relayer that allows you to measure and analyze the performance of your application using different metrics. To measure any of the supported metrics, you only need to pass a function into the reportWebVitals function in index.js: This function is fired whenthe final
CREATING A PRODUCTION BUILD npm run build creates a build directory with a production build of your app. Inside the build/static directory will be your JavaScript and CSS files. Each filename inside of build/static will contain a unique hash of the file contents. This hash in the file name enables long term caching techniques.. When running a production build of freshly created Create React App application, there are a USING HTTPS IN DEVELOPMENT Note: this feature is available with and higher.. You may require the dev server to serve pages over HTTPS. One particular case where this could be useful is when using the "proxy" feature to proxy requests to an API server when that API server is itself serving HTTPS.. To do this, set the HTTPS environment variable to true, then start the dev server as usual with npm start: IMPORTING A COMPONENT This project setup supports ES6 modules thanks to webpack. While you can still use require() and module.exports, we encourage you to use import and export instead.. For example: Button.js# ADDING CUSTOM ENVIRONMENT VARIABLES Note: You must create custom environment variables beginning with REACT_APP_.Any other variables except NODE_ENV will be ignored to avoid accidentally exposing a private key on the machine that could have the same name.Changing any environment variables will require you to restart the development server if it is running. USING THE PUBLIC FOLDER PROXYING API REQUESTS IN DEVELOPMENT Such setup is not required. However, if you do have a setup like this, it is convenient to write requests like fetch('/api/todos') without worrying about redirecting them to another host or port during development.. To tell the development server to proxy any unknown requests to your API server in development, add a proxy field to your package.json, for example: ADDING A SASS STYLESHEET Note: You must prefix imports from node_modules with ~ as displayed above. node-sass also supports the SASS_PATH variable.. To use imports relative to a path you specify, and from node_modules without adding the ~ prefix, you can add a .env file at the project root with the variable SASS_PATH=node_modules:src.To specify more directories you can add them to SASS_PATH CREATE REACT APPCREATE REACT APPGETTING STARTEDADDING TYPESCRIPTADDINGBOOTSTRAP
Get started in seconds. Whether you’re using React or another library, Create React App lets you focus on code, not build tools. To create a project called my-app, runRUNNING TESTS
Note: this feature is available with and higher.. Read the migration guide to learn how to enable it in older projects! Create React App uses Jest as its test runner. To prepare for this integration, we did a major revamp of Jest so if you heard bad things about it years ago, give it another try.. Jest is a Node-based runner. MEASURING PERFORMANCE Measuring Performance. By default, Create React App includes a performance relayer that allows you to measure and analyze the performance of your application using different metrics. To measure any of the supported metrics, you only need to pass a function into the reportWebVitals function in index.js: This function is fired whenthe final
CREATING A PRODUCTION BUILD npm run build creates a build directory with a production build of your app. Inside the build/static directory will be your JavaScript and CSS files. Each filename inside of build/static will contain a unique hash of the file contents. This hash in the file name enables long term caching techniques.. When running a production build of freshly created Create React App application, there are a USING HTTPS IN DEVELOPMENT Note: this feature is available with and higher.. You may require the dev server to serve pages over HTTPS. One particular case where this could be useful is when using the "proxy" feature to proxy requests to an API server when that API server is itself serving HTTPS.. To do this, set the HTTPS environment variable to true, then start the dev server as usual with npm start: IMPORTING A COMPONENT This project setup supports ES6 modules thanks to webpack. While you can still use require() and module.exports, we encourage you to use import and export instead.. For example: Button.js# ADDING CUSTOM ENVIRONMENT VARIABLES Note: You must create custom environment variables beginning with REACT_APP_.Any other variables except NODE_ENV will be ignored to avoid accidentally exposing a private key on the machine that could have the same name.Changing any environment variables will require you to restart the development server if it is running.GETTING STARTED
Creating a TypeScript app#. You can start a new TypeScript app using templates. To use our provided TypeScript template, append --template typescript to the creation command. Copy. npx create-react-app my-app --template typescript. If you already have a project and would like to add TypeScript, see our Adding TypeScript documentation.RUNNING TESTS
Note: this feature is available with and higher.. Read the migration guide to learn how to enable it in older projects! Create React App uses Jest as its test runner. To prepare for this integration, we did a major revamp of Jest so if you heard bad things about it years ago, give it another try.. Jest is a Node-based runner. CREATING A PRODUCTION BUILD npm run build creates a build directory with a production build of your app. Inside the build/static directory will be your JavaScript and CSS files. Each filename inside of build/static will contain a unique hash of the file contents. This hash in the file name enables long term caching techniques.. When running a production build of freshly created Create React App application, there are a SETTING UP YOUR EDITOR Visual Studio Code and WebStorm support debugging out of the box with Create React App. This enables you as a developer to write and debug your React code without leaving the editor, and most importantly it enables you to have a continuous development workflow, where context switching is minimal, as you don’t have to switch between tools. MAKING A PROGRESSIVE WEB APP The production build has all the tools necessary to generate a first-class Progressive Web App, but the offline/cache-first behavior is opt-in only. Starting with Create React App 4, you can add a src/service-worker.js file to your project to use the built-in support for Workbox's InjectManifest plugin, which will compile your service worker and inject into it a list of URLs to precache. UPDATING TO NEW RELEASES Updating to New Releases. Create React App is divided into two packages: create-react-app is a global command-line utility that you use to create new projects. react-scripts is a development dependency in the generated projects (including this one). When you run npx create-react-app my-app it automatically installs the latest versionof Create
TITLE AND META TAGS
Changing the title tag. Then, on the server, regardless of the backend you use, you can read index.html into memory and replace __OG_TITLE__, __OG_DESCRIPTION__, and any other placeholders with values depending on the current URL.Make sure to sanitize and escape the interpolated values so that they are safe to embed into HTML! ANALYZING THE BUNDLE SIZE Analyzing the Bundle Size. Source map explorer analyzes JavaScript bundles using the source maps. This helps you understand where code bloat is coming from. To add Source map explorer to a Create React App project, follow these steps: Copy. npm install --save source-map-explorer. Alternatively you may use yarn:ADDING A STYLESHEET
This project setup uses webpack for handling all assets. webpack offers a custom way of “extending” the concept of import beyond JavaScript. To express that a JavaScript file depends on a CSS file, you need to import the CSS from the JavaScript file: ADDING A SASS STYLESHEET Note: You must prefix imports from node_modules with ~ as displayed above. node-sass also supports the SASS_PATH variable.. To use imports relative to a path you specify, and from node_modules without adding the ~ prefix, you can add a .env file at the project root with the variable SASS_PATH=node_modules:src.To specify more directories you can add them to SASS_PATH CREATE REACT APPCREATE REACT APPGETTING STARTEDADDING TYPESCRIPTADDINGBOOTSTRAP
No Lock-In. Under the hood, we use webpack, Babel, ESLint, and other amazing projects to power your app. If you ever want an advanced configuration, you can ”eject” from Create React App and edit their config files directly.RUNNING TESTS
Note: this feature is available with and higher.. Read the migration guide to learn how to enable it in older projects! Create React App uses Jest as its test runner. To prepare for this integration, we did a major revamp of Jest so if you heard bad things about it years ago, give it another try.. Jest is a Node-based runner. MEASURING PERFORMANCE This function is fired when the final values for any of the metrics have finished calculating on the page. You can use it to log any of the results to the console or send to a particular endpoint. CREATING A PRODUCTION BUILD npm run build creates a build directory with a production build of your app. Inside the build/static directory will be your JavaScript and CSS files. Each filename inside of build/static will contain a unique hash of the file contents. This hash in the file name enables long term caching techniques.. When running a production build of freshly created Create React App application, there are a IMPORTING A COMPONENT This project setup supports ES6 modules thanks to webpack. While you can still use require() and module.exports, we encourage you to use import and export instead.. For example: Button.js# USING HTTPS IN DEVELOPMENT Note: this feature is available with and higher.. You may require the dev server to serve pages over HTTPS. One particular case where this could be useful is when using the "proxy" feature to proxy requests to an API server when that API server is itself serving HTTPS.. To do this, set the HTTPS environment variable to true, then start the dev server as usual with npm start: ADDING CUSTOM ENVIRONMENT VARIABLES Note: You must create custom environment variables beginning with REACT_APP_.Any other variables except NODE_ENV will be ignored to avoid accidentally exposing a private key on the machine that could have the same name.Changing any environment variables will require you to restart the development server if it is running. USING THE PUBLIC FOLDER PROXYING API REQUESTS IN DEVELOPMENT Such setup is not required. However, if you do have a setup like this, it is convenient to write requests like fetch('/api/todos') without worrying about redirecting them to another host or port during development.. To tell the development server to proxy any unknown requests to your API server in development, add a proxy field to your package.json, for example: ADDING A SASS STYLESHEET Note: You must prefix imports from node_modules with ~ as displayed above. node-sass also supports the SASS_PATH variable.. To use imports relative to a path you specify, and from node_modules without adding the ~ prefix, you can add a .env file at the project root with the variable SASS_PATH=node_modules:src.To specify more directories you can add them to SASS_PATH CREATE REACT APPCREATE REACT APPGETTING STARTEDADDING TYPESCRIPTADDINGBOOTSTRAP
No Lock-In. Under the hood, we use webpack, Babel, ESLint, and other amazing projects to power your app. If you ever want an advanced configuration, you can ”eject” from Create React App and edit their config files directly.RUNNING TESTS
Note: this feature is available with and higher.. Read the migration guide to learn how to enable it in older projects! Create React App uses Jest as its test runner. To prepare for this integration, we did a major revamp of Jest so if you heard bad things about it years ago, give it another try.. Jest is a Node-based runner. MEASURING PERFORMANCE This function is fired when the final values for any of the metrics have finished calculating on the page. You can use it to log any of the results to the console or send to a particular endpoint. CREATING A PRODUCTION BUILD npm run build creates a build directory with a production build of your app. Inside the build/static directory will be your JavaScript and CSS files. Each filename inside of build/static will contain a unique hash of the file contents. This hash in the file name enables long term caching techniques.. When running a production build of freshly created Create React App application, there are a IMPORTING A COMPONENT This project setup supports ES6 modules thanks to webpack. While you can still use require() and module.exports, we encourage you to use import and export instead.. For example: Button.js# USING HTTPS IN DEVELOPMENT Note: this feature is available with and higher.. You may require the dev server to serve pages over HTTPS. One particular case where this could be useful is when using the "proxy" feature to proxy requests to an API server when that API server is itself serving HTTPS.. To do this, set the HTTPS environment variable to true, then start the dev server as usual with npm start: ADDING CUSTOM ENVIRONMENT VARIABLES Note: You must create custom environment variables beginning with REACT_APP_.Any other variables except NODE_ENV will be ignored to avoid accidentally exposing a private key on the machine that could have the same name.Changing any environment variables will require you to restart the development server if it is running. USING THE PUBLIC FOLDER PROXYING API REQUESTS IN DEVELOPMENT Such setup is not required. However, if you do have a setup like this, it is convenient to write requests like fetch('/api/todos') without worrying about redirecting them to another host or port during development.. To tell the development server to proxy any unknown requests to your API server in development, add a proxy field to your package.json, for example: ADDING A SASS STYLESHEET Note: You must prefix imports from node_modules with ~ as displayed above. node-sass also supports the SASS_PATH variable.. To use imports relative to a path you specify, and from node_modules without adding the ~ prefix, you can add a .env file at the project root with the variable SASS_PATH=node_modules:src.To specify more directories you can add them to SASS_PATHGETTING STARTED
yarn create is available in Yarn 0.25+. Selecting a template#. You can now optionally start a new app from a template by appending --template to the creation command.. If you don't select a template, we'll create your project with our base template.RUNNING TESTS
Note: this feature is available with and higher.. Read the migration guide to learn how to enable it in older projects! Create React App uses Jest as its test runner. To prepare for this integration, we did a major revamp of Jest so if you heard bad things about it years ago, give it another try.. Jest is a Node-based runner. CREATING A PRODUCTION BUILD npm run build creates a build directory with a production build of your app. Inside the build/static directory will be your JavaScript and CSS files. Each filename inside of build/static will contain a unique hash of the file contents. This hash in the file name enables long term caching techniques.. When running a production build of freshly created Create React App application, there are a SETTING UP YOUR EDITOR Debugging in the Editor#. This feature is currently only supported by Visual Studio Code and WebStorm.. Visual Studio Code and WebStorm support debugging out of the box with Create React App. UPDATING TO NEW RELEASES Create React App is divided into two packages: create-react-app is a global command-line utility that you use to create new projects.; react-scripts is a development dependency in the generated projects (including this one).; When you run npx create-react-app my-app it automatically installs the latest version of Create React App. . If you've previously installed create-react-app globally via MAKING A PROGRESSIVE WEB APP The production build has all the tools necessary to generate a first-class Progressive Web App, but the offline/cache-first behavior is opt-in only. Starting with Create React App 4, you can add a src/service-worker.js file to your project to use the built-in support for Workbox's InjectManifest plugin, which will compile your service worker and inject into it a list of URLs to precache.TITLE AND META TAGS
Changing the title tag. Then, on the server, regardless of the backend you use, you can read index.html into memory and replace __OG_TITLE__, __OG_DESCRIPTION__, and any other placeholders with values depending on the current URL.Make sure to sanitize and escape the interpolated values so that they are safe to embed into HTML!ADDING A STYLESHEET
This project setup uses webpack for handling all assets. webpack offers a custom way of “extending” the concept of import beyond JavaScript. To express that a JavaScript file depends on a CSS file, you need to import the CSS from the JavaScript file: ADDING A SASS STYLESHEET Note: You must prefix imports from node_modules with ~ as displayed above. node-sass also supports the SASS_PATH variable.. To use imports relative to a path you specify, and from node_modules without adding the ~ prefix, you can add a .env file at the project root with the variable SASS_PATH=node_modules:src.To specify more directories you can add them to SASS_PATH ANALYZING THE BUNDLE SIZE Source map explorer analyzes. Then to analyze the bundle run the production build then run the analyze script. MenuCREATE REACT APPDocs Help
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CREATE REACT APP
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CREATE REACT APP
Set up a modern web app by running one command.Get Started
LESS TO LEARN
You don't need to learn and configure many build tools. Instant reloads help you focus on development. When it's time to deploy, your bundles are optimized automatically.ONLY ONE DEPENDENCY
Your app only needs one build dependency. We test Create React App to make sure that all of its underlying pieces work together seamlessly – no complicated version mismatches.NO LOCK-IN
Under the hood, we use webpack, Babel, ESLint, and other amazing projects to power your app. If you ever want an advanced configuration, you can ”eject” from Create React App and edit their config files directly. GET STARTED IN SECONDS Whether you’re using React or another library, Create React App lets you FOCUS ON CODE, NOT BUILD TOOLS. To create a project called _my-app_, run this command:Copy
npx create-react-app my-appEASY TO MAINTAIN
Updating your build tooling is typically a daunting and time-consuming task. When new versions of Create React App are released, you can upgrade using a single command:Copy
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