Add Linting to Create-React-App

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Create-React-App gives a nice bootstrapped project. I like being able to lint outside of the build or run process of the application, like on pre-commit hooks with husky. To do that I needed to add linting to my create-react-app. Follow these steps to add linting to your create-react-app project and get linting outside of your build process.

Install packages 📦

This is the most painful part of the process I kept installing one package after another to see if linting worked. All-in-all seven packages later I finally had everything there and ready to run based on the configurations from create-react-app.

npm i --save-dev babel-eslint eslint-config-react-app eslint-plugin-flowtype eslint-plugin-import eslint-plugin-jsx-a11y eslint-plugin-react eslint-plugin-react-hooks

yarn add --dev babel-eslint eslint-config-react-app eslint-plugin-flowtype eslint-plugin-import eslint-plugin-jsx-a11y eslint-plugin-react eslint-plugin-react-hooks

Add ESLint Configuration to package.json

You can either supply this in a separate file (.eslintrc.json/.eslintrc.js) or right in your package.json. For larger configuration changes I would recommend a separate file but I’m just extending the react-app configuration and applying a couple of rule adjustments.

  "eslintConfig": {
    "extends": "react-app",
    "rules": {
      "semi": 0,
      "no-console": 0
    }
  },

Add Linting Script

Now, all we need to do is to add the linting script to our package.json and we’ll be able to lint whenever we want. Even hook up husky or add a specific step for linting in our CI/CD pipeline.

  "scripts": {
    ...
    "lint": "node_modules/.bin/eslint --ext js src"
  },

Comments

[David Johnston]

This seems unneccessary. CRA already has eslint installed.
See this answer: stackoverflow.com/a/66438578/1068446