- This App is completely made with React, and can be used to practice summation problems on a day to day basis.
- Don't forget to add the node modules, I love DRY, so I dropped the idea of adding node_modules.
This project was bootstrapped with Create React App.
Below you will find some information on how to perform common tasks.
You can find the most recent version of this guide here.
- Updating to New Releases
- Sending Feedback
- Folder Structure
- Available Scripts
- Supported Browsers
- Supported Language Features and Polyfills
- Syntax Highlighting in the Editor
- Displaying Lint Output in the Editor
- Debugging in the Editor
- Formatting Code Automatically
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.
We are always open to your feedback.
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
, otherwise 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.
Prettier is an opinionated code formatter with support for JavaScript, CSS and JSON. With Prettier you can format the code you write automatically to ensure a code style within your project. See the Prettier's GitHub page for more information, and look at this page to see it in action.
To format our code whenever we make a commit in git, we need to install the following dependencies:
npm install --save husky lint-staged prettier
Alternatively you may use yarn
:
yarn add husky lint-staged prettier
husky
makes it easy to use githooks as if they are npm scripts.lint-staged
allows us to run scripts on staged files in git. See this blog post about lint-staged to learn more about it.prettier
is the JavaScript formatter we will run before commits.
Now we can make sure every file is formatted correctly by adding a few lines to the package.json
in the project root.
Add the following line to scripts
section:
"scripts": {
+ "precommit": "lint-staged",
"start": "react-scripts start",
"build": "react-scripts build",
Next we add a 'lint-staged' field to the package.json
, for example:
"dependencies": {
// ...
},
+ "lint-staged": {
+ "src/**/*.{js,jsx,json,css}": [
+ "prettier --single-quote --write",
+ "git add"
+ ]
+ },
"scripts": {
Now, whenever you make a commit, Prettier will format the changed files automatically. You can also run ./node_modules/.bin/prettier --single-quote --write "src/**/*.{js,jsx,json,css}"
to format your entire project for the first time.
Next you might want to integrate Prettier in your favorite editor. Read the section on Editor Integration on the Prettier GitHub page.
.
For example, this:
.App {
display: flex;
flex-direction: row;
align-items: center;
}
becomes this:
.App {
display: -webkit-box;
display: -ms-flexbox;
display: flex;
-webkit-box-orient: horizontal;
-webkit-box-direction: normal;
-ms-flex-direction: row;
flex-direction: row;
-webkit-box-align: center;
-ms-flex-align: center;
align-items: center;
}