This package provides flexible ESLint, Prettier, and TypeScript configurations for use in both browser and Node.js projects.

Installation

To install this package, run the following command:

# If you use npm
npm install --save-dev @tronite/style-guide

# If you use yarn
yarn add --dev @tronite/style-guide

# If you use pnpm
pnpm add --save-dev @tronite/style-guide

ESLint

This ESLint config is designed to be composable.

The following base configs are available. You can use one or both of these configs, but they should always be first in extends:

• @tronite/style-guide/eslint/browser
• @tronite/style-guide/eslint/node

Note that you can scope configs, so that configs only target specific files. For more information, see: Scoped configuration with overrides.

The following additional configs are available:

• @tronite/style-guide/eslint/next (requires @next/eslint-plugin-next to be installed at the same version as next)
• @tronite/style-guide/eslint/react
• @tronite/style-guide/eslint/typescript (requires typescript to be installed and additional configuration)
• @tronite/style-guide/eslint/vitest

You'll need to use require.resolve to provide ESLint with absolute paths, due to an issue around ESLint config resolution (see eslint/eslint#9188).

For example, use the shared ESLint config(s) in a Next.js project, set the following in .eslintrc.js.

module.exports = {
  extends: [
    require.resolve('@tronite/style-guide/eslint/browser'),
    require.resolve('@tronite/style-guide/eslint/react'),
    require.resolve('@tronite/style-guide/eslint/next'),
  ],
};

Configuring ESLint for TypeScript

Some of the rules enabled in the TypeScript config require additional type information, you'll need to provide the path to your tsconfig.json.

For more information, see: https://typescript-eslint.io/docs/linting/type-linting

const { resolve } = require('path');

const project = resolve(__dirname, 'tsconfig.json');

module.exports = {
  root: true,
  extends: [
    require.resolve('@tronite/style-guide/eslint/node'),
    require.resolve('@tronite/style-guide/eslint/typescript'),
  ],
  parserOptions: {
    project,
  },
  settings: {
    'import/resolver': {
      typescript: {
        project,
      },
    },
  },
};

Configuring custom components for jsx-a11y

It's common practice for React apps to have shared components like Button, which wrap native elements. You can pass this information along to jsx-a11y via the components setting.

The below list is not exhaustive.

module.exports = {
  root: true,
  extends: [require.resolve('@tronite/style-guide/eslint/react')],
  settings: {
    'jsx-a11y': {
      components: {
        Article: 'article',
        Button: 'button',
        Image: 'img',
        Input: 'input',
        Link: 'a',
        Video: 'video',
      },
    },
  },
};

Scoped configuration with overrides

ESLint configs can be scoped to include/exclude specific paths. This ensures that rules don't "leak" into places where those rules don't apply.

In this example, Jest rules are only being applied to files matching Jest's default test match pattern.

module.exports = {
  extends: [require.resolve('@tronite/style-guide/eslint/node')],
  overrides: [
    {
      files: ['**/__tests__/**/*.[jt]s?(x)', '**/?(*.)+(spec|test).[jt]s?(x)'],
      extends: [require.resolve('@tronite/style-guide/eslint/jest')],
    },
  ],
};

A note on file extensions

By default, all TypeScript rules are scoped to files ending with .ts and .tsx.

However, when using overrides, file extensions must be included or ESLint will only include .js files.

module.exports = {
  overrides: [{ files: [`directory/**/*.[jt]s?(x)`], rules: { 'my-rule': 'off' } }],
};

Prettier

This package provides a single Prettier configuration:

• @tronite/style-guide/prettier

Prettier is a peer dependency of this package, so you will need to install it separately:

# If you use npm
npm install --save-dev prettier

# If you use yarn
yarn add --dev prettier

# If you use pnpm
pnpm add --save-dev prettier

To use this configuration, create a .prettierrc.js file in the root of your project and add the following:

module.exports = require('@tronite/style-guide/prettier');

Alternatively, you can add the following to your package.json file:

{
  "prettier": "@tronite/style-guide/prettier"
}

TypeScript

This package provides the following TypeScript configurations:

• @tronite/style-guide/typescript/esm - for ESM projects
• @tronite/style-guide/typescript/next - for Next.js projects
• @tronite/style-guide/typescript/node - for Node.js
• @tronite/style-guide/typescript/react.es5 - for React projects that target ES5
• @tronite/style-guide/typescript/react.es2020 - for React projects that target ES2020

TypeScript is a peer dependency of this package, so you will need to install it separately:

# If you use npm
npm install --save-dev typescript

# If you use yarn
yarn add --dev typescript

# If you use pnpm
pnpm add --save-dev typescript

To use one of these configurations, create a tsconfig.json file in the root of your project and add the following:

{
  "extends": "@tronite/style-guide/typescript/<config>",
  "include": ...,
  "exclude": ...
}

To use one of these configurations, replace <config> with the desired configuration name, such as next. Don't forget to update the include and exclude arrays with the appropriate source file paths. Each configuration has its own default include and exclude paths, so make sure to extend them from the chosen configuration.

Credits

This package was heavily inspired by @vercel/style-guide and as such, it uses the same license. See the LICENSE file for more information. Vercel's style guide was a little bit too opinionated for our needs, so we decided to create a more flexible alternative.