eslint-config-conventions

ESLint shareable config to enforce strict conventions and good code quality.

📜 About

eslint-config-conventions is a ESLint configuration to enforce strict conventions and good code quality, it is highly inspired from eslint-config-standard-with-typescript but it is stricter and with no formatting rules, only code-quality rules. It supports both JavaScript and TypeScript.

This configuration is mostly for catching bugs and code-quality so it is recommended to use it with Prettier for a consistent code style, it works with any .prettierrc.json configuration.

More information about formatting rules vs code-quality rules can be found on Prettier vs. Linters.

⚙️ Getting Started

Prerequisites

• Node.js >= 16.0.0

Installation

npm@<7 does not automatically install peerDependencies, so if that's what you're using, install them manually. Here is an example, but use it only for reference, because your decisions regarding version ranges and range specifiers may vary.

npm install --save-dev \
  eslint@^8.33.0 \
  eslint-plugin-import@^2.27.5 \
  eslint-plugin-promise@^6.1.1 \
  eslint-plugin-unicorn@^47.0.0 \
  eslint-config-conventions@latest

Yes, this is a large number of packages. This is due to a known limitation in ESLint.

This list of dependencies are:

• ESLint
• 3 ESLint Plugins
  • eslint-plugin-import
  • eslint-plugin-promise
  • eslint-plugin-unicorn
• This package: eslint-config-conventions

If you want to use TypeScript, you also need to install:

npm install --save-dev \
  typescript@^5.0.4 \
  @typescript-eslint/eslint-plugin@^5.59.5 \
  @typescript-eslint/parser@^5.59.5

Dependencies are:

• TypeScript
• @typescript-eslint/eslint-plugin; ESLint rules for TypeScript.
• @typescript-eslint/parser; ESLint parser for TypeScript.

Configuration with Prettier (recommended)

You will need to install some dependencies in addition to those required:

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

# Create an empty config file to let editors and other tools know you are using Prettier
# You can personalize it with your own rules
echo {}> .prettierrc.json

.eslintrc.json

{
  "extends": ["conventions", "prettier"],
  "plugins": ["prettier"],
  "parserOptions": {
    "project": "./tsconfig.json"
  },
  "rules": {
    "prettier/prettier": "error"
  }
}

Note: Please read some important instructions regarding the project option here.

"parserOptions.project" is only required if you use TypeScript.

package.json

{
  "scripts": {
    "lint:eslint": "eslint \"**/*.{js,jsx,ts,tsx}\" --ignore-path \".gitignore\"",
    "lint:prettier": "prettier \".\" --check --ignore-path \".gitignore\""
  }
}

Usage

npm run lint:eslint
# or to apply automatic fixes to code
npm run lint:eslint -- --fix

# Validate code formatting in all supported languages by Prettier
npm run lint:prettier

💡 Contributing

Anyone can help to improve the project, submit a Feature Request, a bug report or even correct a simple spelling mistake.

The steps to contribute can be found in the CONTRIBUTING.md file.

📄 License

MIT