pol-standard
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Pol Gubau's projects engineering style guide
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Style Guide for Frontend Development
Introduction
This repository is the home of my style guide, which includes configs for popular linting and styling tools.
It's directly inspired by the Vercel Style Guide.
The following configs are available, and are designed to be used together.
Installation
All of our configs are contained in one package, pol-standard
. To install:
# If you use npm
npm i --save-dev pol-standard
# If you use pnpm
pnpm i --save-dev pol-standard
# If you use Yarn
yarn add --dev pol-standard
Some of our ESLint configs require peer dependencies. We'll note those alongside the available configs in the ESLint section.
Prettier
Note: Prettier is a peer-dependency of this package, and should be installed at the root of your project.
See: https://prettier.io/docs/en/install.html
To use the shared Prettier config, set the following in package.json
.
{
"prettier": "pol-standard/prettier"
}
ESLint
Note: ESLint is a peer-dependency of this package, and should be installed at the root of your project.
See: https://eslint.org/docs/user-guide/getting-started#installation-and-usage
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
:
pol-standard/eslint/browser
pol-standard/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:
pol-standard/eslint/jest
pol-standard/eslint/jest-react
(includes rules for@testing-library/react
)pol-standard/eslint/next
(requires@next/eslint-plugin-next
to be installed at the same version asnext
)pol-standard/eslint/playwright-test
pol-standard/eslint/react
pol-standard/eslint/typescript
(requirestypescript
to be installed and additional configuration)pol-standard/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 react project, set the
following in .eslintrc.js
.
// Standard eslint config for next.js projects
module.exports = {
extends: [
require.resolve('pol-standard/eslint/browser'),
require.resolve('pol-standard/eslint/react'),
require.resolve('pol-standard/eslint/typescript'),
],
overrides: [
{
files: ['**/__tests__/**/*.[jt]s?(x)', '**/?(*.)+(spec|test).[jt]s?(x)'],
extends: [
require.resolve('pol-standard/eslint/jest'),
require.resolve('pol-standard/eslint/jest-react'),
// or if you use Vitest:
require.resolve('pol-standard/eslint/vitest'),
],
},
],
};
Or for Next.js projects with TypeScript, set the following in .eslintrc.js
.
// Standard eslint config for next.js projects
module.exports = {
extends: [
require.resolve('pol-standard/eslint/browser'),
require.resolve('pol-standard/eslint/react'),
require.resolve('pol-standard/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('node:path');
const project = resolve(__dirname, 'tsconfig.json');
module.exports = {
root: true,
extends: [
require.resolve('pol-standard/eslint/node'),
require.resolve('pol-standard/eslint/react'),
require.resolve('pol-standard/eslint/typescript'),
require.resolve('pol-standard/eslint/browser'),
require.resolve('pol-standard/eslint/vitest'),
// ... other configs
],
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('pol-standard/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('pol-standard/eslint/node')],
overrides: [
{
files: ['**/__tests__/**/*.[jt]s?(x)', '**/?(*.)+(spec|test).[jt]s?(x)'],
extends: [require.resolve('pol-standard/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' } },
],
};
TypeScript
This style guide provides multiple TypeScript configs. These configs correlate to the LTS Node.js versions, providing the appropriate lib
, module
, target
, and moduleResolution
settings for each version. The following configs are available:
Node.js Version
v16 : pol-standard/typescript/node16
v18 : pol-standard/typescript/node18
v20 : pol-standard/typescript/node20
To use the shared TypeScript config, set the following in tsconfig.json
.
{
"extends": "pol-standard/typescript/node16"
}
The base TypeScript config is also available as pol-standard/typescript
which only specifies a set of general rules. You should inherit from this file when setting custom lib
, module
, target
, and moduleResolution
settings.