1. Init the project
npm init --yes
// OR
yarn init --yes
2. Install Prettier
npm install prettier --save-dev
// OR
yarn add prettier --dev
3. Add format script to package.json
"scripts": {
"format": "prettier --write \"**/*.{js,jsx,ts,tsx,css,json}\""
}
4. Run prettier with format script
npm run format
// OR
yarn format
It will format all files within the listed extensions in format script.