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Author message:

This package has been superseded by @bonniernews/eslint-config, please upgrade.

eslint-config-exp

Basic ESLint rules used by Expressen. The configuration works both with CommonJS and ES6 modules, and the appropriate setup will be used by looking at the projects package.json type property.

For Node versions that support it (version 16 and above), the es2022 environment will also be activated. Otherwise es2021 will be used.

Usage

Install eslint and eslint-config-exp:

npm install --save-dev eslint eslint-config-exp

Base configuration

To activate the config, you need to add the following to your .eslintrc.json-file:

{
  "root": true,
  "extends": [ "exp" ]
}

React configuration

To activate the config, you need to add the following to your .eslintrc.json-file:

{
  "root": true,
  "extends": [ "exp/react" ]
}

This will enable the react plugin for *.jsx-files.

TypeScript configuration

To activate the config, you need to add the following to your .eslintrc.json-file:

{
  "root": true,
  "extends": [ "exp/typescript" ]
}

This will enable the typescript plugin for *.ts-files.

React with TypeScript configuration

To activate the config, you need to add the following to your .eslintrc.json-file:

{
  "root": true,
  "extends": [ "exp/typescript-react" ]
}

This will enable the typescript and react plugin for *.tsx-files.

Test configuration

You can also choose to use the test config, which is adapted to testing using mocha, mocha-cakes-2 and chai. To also enable this, either add a separate test configuration file extending from "exp/test", or use the "exp/all" in your root configuration to activate everything together:

{
  "root": true,
  "extends": [ "exp/all" ]
}

This will activate the test configuration for all files inside directories named test or tests.

Running eslint

Run with:

npx eslint .

Usage in an existing project

• We advice to remove any husky hooks that uses libraries such as pretty-quick from your package.json
• Subsequently remove any use of pretty-quick if possible.
• Remove any previous use of sharable ESLint configs from package.json, i.e.:
  • eslint-config-airbnb
  • eslint-config-google
  • eslint-config-prettier
• Remove eslint-plugin-prettier from package.json
• If you get errors similar to the ones below, please update the eslint dependancy.
  • Definition for rule 'no-nonoctal-decimal-escape' was not found
  • Definition for rule 'no-unsafe-optional-chaining' was not found
• If you still have issues; try updating npm (if you use nvm nvm install-latest-npm) & prettier as-well
• Remove any 'eslint-disable-line no-unused-expressions' directives added because of chai assertions, they are not needed anymore (eslint-plugin-chai-friendly is used in test).
• Remove any globals and special rules related to mocha-cakes-2 in your test configuration, they already exist in the eslint-config-exp/test and eslint-config-exp/all configs.

Once you complete the steps above run the following:

npx eslint . --fix

Usage with Prettier

If you want to use Prettier, run it before eslint. ESLint should be the final judge, i.e. run:

npx prettier --save .
npx eslint . --fix

This will format the entire code base according to the rules of Prettier and the config.

Enable format on save

• Visual Studio Code

Changelog

Can be found here.

License

Released under the MIT license.