ESLint Plugin Perfectionist

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, etc.

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, then 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 the beauty salon!

Documentation

See docs.

Installation

You'll first need to install ESLint:

npm install --save-dev eslint

Next, install eslint-plugin-perfectionist:

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.

Legacy Config (.eslintrc)

{
  "plugins": [
    "perfectionist"
  ],
  "rules": {
    "perfectionist/sort-objects": [
      "error",
      {
        "type": "line-length",
        "order": "desc"
      }
    ]
  }
}

Flat Config (eslint.config.js) (requires eslint >= v8.23.0)

import perfectionist from 'eslint-plugin-perfectionist'

export default [
  {
    plugins: {
      perfectionist,
    },
    rules: {
      'perfectionist/sort-objects': [
        'error',
        {
          type: 'line-length',
          order: 'desc',
        },
      ],
    },
  },
]

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.

Legacy Config (.eslintrc)

{
  "extends": [
    "plugin:perfectionist/recommended-line-length"
  ]
}

Flat Config (eslint.config.js)

import perfectionistLineLength from 'eslint-plugin-perfectionist/configs/recommended-line-length'

export default [
  perfectionistLineLength,
]

List of Configs

Name	Description
recommended-alphabetical	all plugin rules with alphabetical sorting in ascending order
recommended-natural	all plugin rules with natural sorting in ascending order
recommended-line-length	all plugin rules with sorting by line length in descending order

Rules

Automatically fixable by the --fix CLI option.

Name	Description
sort-array-includes	enforce sorted arrays before include method
sort-classes	enforce sorted classes
sort-enums	enforce sorted TypeScript enums
sort-imports	enforce sorted imports
sort-interfaces	enforce sorted interface properties
sort-jsx-props	enforce sorted JSX props
sort-map-elements	enforce sorted Map elements
sort-named-exports	enforce sorted named exports
sort-named-imports	enforce sorted named imports
sort-object-types	enforce sorted object types
sort-objects	enforce sorted objects
sort-union-types	enforce sorted union types

Troubleshooting

There are rules of ESLint and other ESLint plugins that may conflict with the rules of ESLint Plugin Perfectionist. We strongly recommend that you disable rules with similar functionality.

I recommend that you read the documentation before using any rules.

Possible conflicts

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Versioning Policy

This plugin is following Semantic Versioning and ESLint's Semantic Versioning Policy.

Contributing

See Contributing Guide.

See Also

• @azat-io/eslint-config - Collection of ESLint configs

License

MIT © Azat S.