1) Install ESLint and Prettier.

$ npm install --save-dev eslint prettier

2) Install the plugins and configurations that enable them to work together.

$ npm install --save-dev eslint-plugin-prettier eslint-config-prettier

3) Add the following to your ESLint config file:

{
  "plugins": [
    "prettier"
  ],
  "extends": [
    "prettier"
  ],
  "rules": {
    "prettier/prettier": "error"
  }
}

4) Add the lint and prettier commands as npm scripts to package.json:

{
  ...
  "scripts": {
    ...
    "lint": "eslint 'src/**/*.js'",
    "prettier": "prettier --write 'src/**/*.js'",
    "check-all": "npm run prettier && npm run lint",
    ...
  }, 
}

5) Now you can lint and prettify your code at the same time by doing:

$ npm run check-all

Or invoke them separately:

$ npm run lint
$ npm run prettier