eslint-config-codility

Codility's shared ESLint config.

Usage

1. Install the package: yarn add @codility/eslint-config-codility --dev --exact
2. Install peer dependencies and optional dependencies if needed
3. Add .eslintrc.js file:
   • For the vanilla JS version use this:

     /* eslint-disable strict */
     
     'use strict';
     
     module.exports = {
       extends: ['@codility/eslint-config-codility'],
     };
     

   • For the React version use this:

     /* eslint-disable strict */
     
     'use strict';
     
     module.exports = {
       extends: ['@codility/eslint-config-codility/react'],
     };
     

4. Add scripts to your package.json:

"lint": "eslint .",
"lint:fix": "yarn lint -- --fix"

5. Run lint with yarn lint
6. Let the tool fix your code: yarn lint:fix

Migrating to v.2

Previously the only version available included React plugins and had React as a peer dependency, which was annoying for projects that didn't involve it. That version is now available as @codility/eslint-config-codility/react - simply add /react at the end.

Warnings vs errors rationale

Rules for setting up the rules:

• 0 (off):
  • we don't care about the rule
  • we really don't
• 1 (warn):
  • the code can run, but we don't want it on production (e.g. console.log or debugger)
  • stylistic errors
• 2 (error):
  • the code can't run
  • the code can run, but the behaviour might be unexpected
  • the code can run, but it contains a typo for sure