@bluzzi/eslint-config NPM

@bluzzi/eslint-config

A ready-to-use ESLint config preset that's highly opinionated and strict on best practices, allowing you to both lint and format any file that can be used in the JavaScript ecosystem.

📖 formatting (Prettier alternative) with only basic configurations (semi, quotes, indent)
⚒️ very strict rules for JS and TS, which encourages best practices
🌏 designed to work with TS, JSX, React, JSON, YAML, TOML, GraphQL, CSS, HTML and Markdown
✅ automatically enables specific rules based on your dependencies
🧲 uses the recommended shared configs (ESLint, TSLint, Stylistic...)

If you're looking for a less opinionated configuration with more customization possibilities, I recommend you the Antfu preset.

Installation

Installing the config preset in your project.

Packages

npm install -D eslint @bluzzi/eslint-config

yarn add --dev eslint @bluzzi/eslint-config

pnpm install -D eslint @bluzzi/eslint-config

Configuration file

Create the eslint.config.mjs file at the root of the project and add the minimum configuration:

import { eslintConfig } from "@bluzzi/eslint-config";

export default eslintConfig();

Scripts

In your package.json file, you can optionally add the following scripts to easily run ESLint in your project:

{
  "scripts": {
    "lint": "eslint .",
    "lint:fix": "eslint . --fix"
  }
}

VS Code support

Installation and configuration of the VS Code plugin to take advantage of an automatic correction when saving a file, as well as a display of problems.

Install VS Code ESLint extension and add the following settings to your .vscode/settings.json:

{
  // Disable the default formatter, use eslint instead:
  "prettier.enable": false,
  "editor.formatOnSave": false,

  // Auto fix:
  "editor.codeActionsOnSave": {
    "source.fixAll.eslint": "explicit",
    "source.organizeImports": "never"
  },

  // Silent the stylistic rules in you IDE, but still auto fix them:
  "eslint.rules.customizations": [
    { "rule": "style/*", "severity": "off", "fixable": true },
    { "rule": "format/*", "severity": "off", "fixable": true },
    { "rule": "*-indent", "severity": "off", "fixable": true },
    { "rule": "*-spacing", "severity": "off", "fixable": true },
    { "rule": "*-spaces", "severity": "off", "fixable": true },
    { "rule": "*-order", "severity": "off", "fixable": true },
    { "rule": "*-dangle", "severity": "off", "fixable": true },
    { "rule": "*-newline", "severity": "off", "fixable": true },
    { "rule": "*quotes", "severity": "off", "fixable": true },
    { "rule": "*semi", "severity": "off", "fixable": true }
  ],

  // Enable eslint for all supported languages:
  "eslint.validate": [
    "javascript",
    "javascriptreact",
    "typescript",
    "typescriptreact",
    "html",
    "markdown",
    "json",
    "jsonc",
    "yaml",
    "toml",
    "gql",
    "graphql"
  ]
}

Customization

To enable TS type aware rules (recommended for best practice with TS), you need to define the relative path to your tsconfig.json:

export default eslintConfig({
  typescript: { tsconfigPath: "./tsconfig.json" },
});

You can adjust some formatting options for your code, but we recommend sticking to Stylistic's default rules for consistency within the JS community:

export default eslintConfig({
  stylistic: {
    indent: 2,
    quotes: "single",
    semi: false,
  },
});

Finally, you can make full use of the power of ESLint's flat configs to extend the configuration as much as you like:

export default eslintConfig(
  {
    // The configuration options offered by our package
  },

  // From the second arguments they are ESLint Flat Configs
  // you can have multiple configs:
  {
    files: ["**/*.ts"],
    rules: {},
  },
  {
    rules: {},
  },
);