# ESLint Plugin Perfectionist
[](https://npmjs.com/package/eslint-plugin-perfectionist)
[](https://npmjs.com/package/eslint-plugin-perfectionist)
[](https://npmjs.com/package/eslint-plugin-perfectionist)
[](https://github.com/azat-io/eslint-plugin-perfectionist/blob/main/license.md)
An ESLint plugin that sets rules to format your code and make it consistent.
This plugin defines rules for sorting various data, such as objects, imports,
TypeScript types, enums, JSX props, Svelte attributes, etc. alphabetically,
naturally, or by line length.
All rules are automatically fixable. It's safe!
## Why
Sorting imports and properties in software development offers numerous benefits:
- **Readability**: Finding declarations in a sorted, large list is a little
faster. Remember that you read the code much more often than you write it.
- **Maintainability**: Sorting imports and properties is considered a good
practice in software development, contributing to code quality and consistency
across the codebase.
- **Code Review and Collaboration**: If you set rules that say you can only do
things one way, no one will have to spend time thinking about how to do it.
- **Code Uniformity**: When all code looks exactly the same, it is very hard to
see who wrote it, which makes achieving the lofty goal of _collective code
ownership_ easier.
- **Aesthetics**: This not only provides functional benefits, but also gives the
code an aesthetic appeal, visually pleasing and harmonious structure. Take
your code to a beauty salon!
## Documentation
See [docs](https://perfectionist.dev).
### Alphabetical Sorting
### Sorting by Line Length
## Installation
You'll first need to install [ESLint](https://eslint.org) v8.45.0 or greater:
```sh
npm install --save-dev eslint
```
Next, install `eslint-plugin-perfectionist`:
```sh
npm install --save-dev eslint-plugin-perfectionist
```
## Usage
Add `eslint-plugin-perfectionist` to the plugins section of the ESLint
configuration file and define the list of rules you will use.
### Flat Config ([`eslint.config.js`](https://eslint.org/docs/latest/use/configure/configuration-files))
```js
import perfectionist from 'eslint-plugin-perfectionist'
export default [
{
plugins: {
perfectionist,
},
rules: {
'perfectionist/sort-imports': [
'error',
{
type: 'natural',
order: 'asc',
},
],
},
},
]
```
### Legacy Config ([`.eslintrc.js`](https://eslint.org/docs/latest/use/configure/configuration-files-deprecated))
```js
module.exports = {
plugins: [
'perfectionist',
],
rules: {
'perfectionist/sort-imports': [
'error',
{
type: 'natural',
order: 'asc',
}
]
}
}
```
## Configs
The easiest way to use `eslint-plugin-perfectionist` is to use ready-made
configs. Config files use all the rules of the current plugin, but you can
override them.
### Flat Config ([`eslint.config.js`](https://eslint.org/docs/latest/use/configure/configuration-files))
```js
import perfectionist from 'eslint-plugin-perfectionist'
export default [
perfectionist.configs['recommended-natural'],
]
```
### Legacy Config ([`.eslintrc.js`](https://eslint.org/docs/latest/use/configure/configuration-files-deprecated))
```js
module.exports = {
extends: [
'plugin:perfectionist/recommended-natural-legacy',
],
}
```
### List of Configs
| Name | Description |
| :------------------------------------------------------------------------------------- | :--------------------------------------------------------------------------- |
| [recommended-alphabetical](https://perfectionist.dev/configs/recommended-alphabetical) | All recommended plugin rules with alphabetical sorting in ascending order |
| [recommended-natural](https://perfectionist.dev/configs/recommended-natural) | All recommended plugin rules with natural sorting in ascending order |
| [recommended-line-length](https://perfectionist.dev/configs/recommended-line-length) | All recommended plugin rules with sorting by line length in descending order |
| [recommended-custom](https://perfectionist.dev/configs/recommended-custom) | All recommended plugin rules with sorting by your own custom order |
## Rules
🔧 Automatically fixable by the
[`--fix` CLI option](https://eslint.org/docs/user-guide/command-line-interface#--fix).
✅ Included in all recommended configs.
| Name | Description | 🔧 | ✅ |
| :--------------------------------------------------------------------------------------- | :----------------------------------------------- | :-- | :-- |
| [sort-arrays](https://perfectionist.dev/rules/sort-arrays) | Enforce sorted arrays based on custom conditions | 🔧 | |
| [sort-array-includes](https://perfectionist.dev/rules/sort-array-includes) | Enforce sorted arrays before include method | 🔧 | ✅ |
| [sort-classes](https://perfectionist.dev/rules/sort-classes) | Enforce sorted classes | 🔧 | ✅ |
| [sort-decorators](https://perfectionist.dev/rules/sort-decorators) | Enforce sorted decorators | 🔧 | ✅ |
| [sort-enums](https://perfectionist.dev/rules/sort-enums) | Enforce sorted TypeScript enums | 🔧 | ✅ |
| [sort-export-attributes](https://perfectionist.dev/rules/sort-export-attributes) | Enforce sorted export attributes | 🔧 | ✅ |
| [sort-exports](https://perfectionist.dev/rules/sort-exports) | Enforce sorted exports | 🔧 | ✅ |
| [sort-heritage-clauses](https://perfectionist.dev/rules/sort-heritage-clauses) | Enforce sorted `implements`/`extends` clauses | 🔧 | ✅ |
| [sort-import-attributes](https://perfectionist.dev/rules/sort-import-attributes) | Enforce sorted import attributes | 🔧 | ✅ |
| [sort-imports](https://perfectionist.dev/rules/sort-imports) | Enforce sorted imports | 🔧 | ✅ |
| [sort-interfaces](https://perfectionist.dev/rules/sort-interfaces) | Enforce sorted interface properties | 🔧 | ✅ |
| [sort-intersection-types](https://perfectionist.dev/rules/sort-intersection-types) | Enforce sorted intersection types | 🔧 | ✅ |
| [sort-jsx-props](https://perfectionist.dev/rules/sort-jsx-props) | Enforce sorted JSX props | 🔧 | ✅ |
| [sort-maps](https://perfectionist.dev/rules/sort-maps) | Enforce sorted Map elements | 🔧 | ✅ |
| [sort-modules](https://perfectionist.dev/rules/sort-modules) | Enforce sorted modules | 🔧 | ✅ |
| [sort-named-exports](https://perfectionist.dev/rules/sort-named-exports) | Enforce sorted named exports | 🔧 | ✅ |
| [sort-named-imports](https://perfectionist.dev/rules/sort-named-imports) | Enforce sorted named imports | 🔧 | ✅ |
| [sort-object-types](https://perfectionist.dev/rules/sort-object-types) | Enforce sorted object types | 🔧 | ✅ |
| [sort-objects](https://perfectionist.dev/rules/sort-objects) | Enforce sorted objects | 🔧 | ✅ |
| [sort-sets](https://perfectionist.dev/rules/sort-sets) | Enforce sorted Set elements | 🔧 | ✅ |
| [sort-switch-case](https://perfectionist.dev/rules/sort-switch-case) | Enforce sorted switch case statements | 🔧 | ✅ |
| [sort-union-types](https://perfectionist.dev/rules/sort-union-types) | Enforce sorted union types | 🔧 | ✅ |
| [sort-variable-declarations](https://perfectionist.dev/rules/sort-variable-declarations) | Enforce sorted variable declarations | 🔧 | ✅ |
## FAQ
### Can I automatically fix problems in the editor?
Yes. To do this, you need to enable autofix in ESLint when you save the file in
your editor. You may find instructions for your editor
[here](https://perfectionist.dev/guide/integrations).
### Is it safe?
Overall, yes. We want to make sure that the work of the plugin does not
negatively affect the behavior of the code. For example, the plugin takes into
account spread operators in JSX and objects, comments to the code. Safety is our
priority. If you encounter any problem, you can create an
[issue](https://github.com/azat-io/eslint-plugin-perfectionist/issues/new/choose).
### Why not use Prettier?
I love Prettier. However, this is not its area of responsibility. Prettier is
used for formatting, and ESLint for styling. For example, changing the order of
imports can affect how the code works (console.log calls, fetch, style loading).
Prettier should not change the AST. There is a cool article about this:
["The Blurry Line Between Formatting and Style"](https://blog.joshuakgoldberg.com/the-blurry-line-between-formatting-and-style)
by **@joshuakgoldberg**.
## Versioning Policy
This plugin is following [Semantic Versioning](https://semver.org/) and
[ESLint's Semantic Versioning Policy](https://github.com/eslint/eslint#semantic-versioning-policy).
## Contributing
See
[Contributing Guide](https://github.com/azat-io/eslint-plugin-perfectionist/blob/main/contributing.md).
## License
MIT © [Azat S.](https://azat.io)