Run:

yarn global add prettier
yarn install onchange --dev
echo '{
  "tabWidth": 4,
  "useTabs": true,
  "semi": false,
  "trailingComma": "es5",
  "insertPragma": true,
  "printWidth": 110,
  "requirePragma": true
}' > .prettierrc

Inside package.json:

"scripts": {
	"prettier-watch": "onchange '**/*.js' -- prettier --write {{changed}}"
},

Insert at the top of any any JS file

/**
 * @prettier
 */