This project was bootstrapped with Create React App.
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).
You almost never need to update create-react-app
itself: it delegates all the setup to react-scripts
.
When you run create-react-app
, it always creates the project with the latest version of react-scripts
so you’ll get all the new features and improvements in newly created apps automatically.
To update an existing project to a new version of react-scripts
, open the changelog, find the version you’re currently on (check package.json
in this folder if you’re not sure), and apply the migration instructions for the newer versions.
In most cases bumping the react-scripts
version in package.json
and running npm install
in this folder should be enough, but it’s good to consult the changelog for potential breaking changes.
We commit to keeping the breaking changes minimal so you can upgrade react-scripts
painlessly.
After creation, your project should look like this:
my-app/
README.md
node_modules/
package.json
public/
index.html
favicon.ico
src/
App.css
App.js
App.test.js
index.css
index.js
logo.svg
For the project to build, these files must exist with exact filenames:
public/index.html
is the page template;src/index.js
is the JavaScript entry point.
You can delete or rename the other files.
You may create subdirectories inside src
. For faster rebuilds, only files inside src
are processed by Webpack.
You need to put any JS and CSS files inside src
, or Webpack won’t see them.
Only files inside public
can be used from public/index.html
.
Read instructions below for using assets from JavaScript and HTML.
You can, however, create more top-level directories.
They will not be included in the production build so you can use them for things like documentation.
In the project directory, you can run:
Runs the app in the development mode.
Open http://localhost:3000 to view it in the browser.
The page will reload if you make edits.
You will also see any lint errors in the console.
Launches the test runner in the interactive watch mode.
See the section about running tests for more information.
Builds the app for production to the build
folder.
It correctly bundles React in production mode and optimizes the build for the best performance.
The build is minified and the filenames include the hashes.
Your app is ready to be deployed!
See the section about deployment for more information.
Note: this is a one-way operation. Once you eject
, you can’t go back!
If you aren’t satisfied with the build tool and configuration choices, you can eject
at any time. This command will remove the single build dependency from your project.
Instead, it will copy all the configuration files and the transitive dependencies (Webpack, Babel, ESLint, etc) right into your project so you have full control over them. All of the commands except eject
will still work, but they will point to the copied scripts so you can tweak them. At this point you’re on your own.
You don’t have to ever use eject
. The curated feature set is suitable for small and middle deployments, and you shouldn’t feel obligated to use this feature. However we understand that this tool wouldn’t be useful if you couldn’t customize it when you are ready for it.
The generated project includes React and ReactDOM as dependencies. It also includes a set of scripts used by Create React App as a development dependency. You may install other dependencies (for example, React Router) with npm
:
npm install --save <library-name>