Who doesn't like auto code formatting, right?
But when it comes to Js/Ts it's comparatively difficult to configure it properly.
I spent may hours googling, finding our how to do it properly.
This is the compilation has worked out best for me. Hope it helps the restless souls who are looking for a good step by step guide to setup their next big projects.
Step 1: Basic Setup
We'll be using Create-react-app
with typescript for our basic setup
run
npx create-react-app my-app --template typescript
cd my-app
Step 2: Eslint
Setup eslint in the repository
npm install eslint --save-dev
npm init @eslint/config
the cli will ask you some questions, you can answer them according to your needs to generate your specific eslint configuration.
In this project these answers are selected
Q. How would you like to use ESLint?
Ans. To check syntax, find problems, and enforce code styleQ. What type of modules does your project use?
Ans. JavaScript modules (import/export)Q.Which framework does your project use?
Ans. ReactQ. Does your project use Typescript?
Ans. YesQ. Where does your code Run?
Ans. BrowserQ. How would you like to define a style for your project?
Ans. Use a popular style guideQ. Which style guide do you want to follow?
Ans. Airbnb: https://github.com/airbnb/javascriptQ. What format do you want your config file to be in?
Ans. JSONQ. Would you like to install them now with npm?
Ans. Yes
at this point a .eslintrc.json
file should be generated in your project root folder.
Navigate to App.tsx , you should notice eslint taking effect.
Hover over the error block, you should see some error message like this
JSX not allowed in files with extension '.tsx'eslintreact/jsx-filename-extension
allow JSX on tsx files by adding this rule to your .eslintrc.json
rules
"react/jsx-filename-extension": [
1,
{ "extensions": [".js", ".jsx", ".ts", ".tsx"] }
]
now eslint will allow Jsx on .ts and .tsx files as well.
add this rule to allow importing files without specifying extensions
"import/extensions": "off"
For typescript project, you'll get import/no-unresolved error. We can disable this error in the rules. But a better way to solve this is to use eslint-plugin-import.
run
npm install eslint-plugin-import --save-dev
add the plugin in .eslintrc.json
file
"extends": [
...,
"plugin:import/recommended",
"plugin:import/typescript",
...
],
Now, the errors should be gone.
Step 3: Prettier
### installing prettier
npm install --save-dev --save-exact prettier
create a .prettierrc.json
file in your project root repository, add your prettier configs there.
add rules in your .prettierrc.json. Eg:
{
"tabWidth": 2,
"semi": false,
"singleQuote": true,
"trailingComma": "es5",
"useTabs": false
}
configuring prettier with eslint
eslint may conflict with prettier rules , eslint-plugin-prettier resolves this issue for us.
run
npm install --save-dev eslint-plugin-prettier
npm install --save-dev eslint-config-prettier
add the plugin in eslint
"extends": [
...,
"plugin:prettier/recommended",
...
],
at this point all the eslint conflicts with prettier should be resolved
Step 4: Husky
We'll be adding husky to add eslint fix and prettier formatting in our pre-commit hook.
install husky
npm install husky -D
npm set-script prepare "husky install"
npm run prepare
if the installation is successful a prepare
script will be added to the package.json
.
adding lint-staged
We'll be using int-staged to run eslint and prettier on our staged files.
Add .lintstagedrc.json
in the project root repository.
populate the file with your commands
{
"*.{js,jsx,ts,tsx}": ["prettier --write", "eslint --fix", "git add"],
"*.{html,css,less,ejs}": ["prettier --write", "git add"]
}
integrating lint-staged with husky
run
npx husky add .husky/pre-commit "npx lint-staged"
git add .husky/pre-commit
now husky pre-commit hook has been configured to run lint-staged.
and every time before committing the hook will run and fix eslint-errors and run prettier on staged files
Step 5: Commitizen
Commit messages are very important for maintaining a project.
It can get difficult to maintain a similar commit convention when you are working in a larger team.
cz-cli is here to help , we can enforce committing format by using the amazing tool.
We'll be using conventional-changelog. configuration to follow AngularJS's commit message convention.
run
npm i --save-dev commitizen
npx commitizen init cz-conventional-changelog --save-dev --save-exact
add this commit script in your package.json
"scripts": {
...,
"commit": "cz"
...
}
add the following confi
add the following configuration to the project's package.json
file:
"husky": {
"hooks": {
"prepare-commit-msg": "exec < /dev/tty && git cz --hook || true"
}
}
now for committing , instead of using git commit
use npm run commit
/ yarn commit
.
You'll get suggestions for commit messages.
That's all . Now your project is all ready to be linted, formatted and it'll be easier for your teammates to follow a similar code convention throughout the code base.
You can find all the code in this repo
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