eslint-plugin-vue

Official ESLint plugin for Vue.js

🎨 Playground on the Web

You can try this plugin on the Web.

https://mysticatea.github.io/vue-eslint-demo/

❕ Requirements

ESLint >=3.18.0.
Node.js >=4.0.0

💿 Installation

npm install --save-dev eslint eslint-plugin-vue

🚀 Usage

Create .eslintrc.* file to configure rules. See also: http://eslint.org/docs/user-guide/configuring.

Example .eslintrc.js:

module.exports = {
  extends: [
    // add more generic rulesets here, such as:
    // 'eslint:recommended',
    'plugin:vue/essential'
  ],
  rules: {
    // override/add rules settings here, such as:
    // 'vue/no-unused-vars': 'error'
  }
}

Attention

All component-related rules are being applied to code that passes any of the following checks:

Vue.component() expression
export default {} in .vue or .jsx file

If you however want to take advantage of our rules in any of your custom objects that are Vue components, you might need to use special comment // @vue/component that marks object in the next line as a Vue component in any file, e.g.:

// @vue/component
const CustomComponent = {
  name: 'custom-component',
  template: '<div></div>'
}

Vue.component('AsyncComponent', (resolve, reject) => {
  setTimeout(() => {
    // @vue/component
    resolve({
      name: 'async-component',
      template: '<div></div>'
    })
  }, 500)
})

`eslint-disable` functionality in `<template>`

You can use -like HTML comments in <template> of .vue files. For example:

<template>
  <!-- eslint-disable-next-line vue/max-attributes-per-line -->
  <div a="1" b="2" c="3" d="4">
  </div>
</template>

If you want to disallow eslint-disable functionality, please disable vue/comment-directive rule.

⚙️ Configs

This plugin provides two predefined configs:

plugin:vue/base - Settings and rules to enable correct ESLint parsing
plugin:vue/essential - Above, plus rules to prevent errors or unintended behavior
plugin:vue/strongly-recommended - Above, plus rules to considerably improve code readability and/or dev experience
plugin:vue/recommended - Above, plus rules to enforce subjective community defaults to ensure consistency

💡 Rules

Rules are grouped by priority to help you understand their purpose. The --fix option on the command line automatically fixes problems reported by rules which have a wrench 🔧 below.

Base Rules (Enabling Correct ESLint Parsing)

Enforce all the rules in this category, as well as all higher priority rules, with:

{
  "extends": "plugin:vue/base"
}

	Rule ID	Description
	vue/comment-directive	support comment-directives in `<template>`
	vue/jsx-uses-vars	prevent variables used in JSX to be marked as unused

Priority A: Essential (Error Prevention)

Enforce all the rules in this category, as well as all higher priority rules, with:

{
  "extends": "plugin:vue/essential"
}

	Rule ID	Description
	vue/no-async-in-computed-properties	disallow asynchronous actions in computed properties
	vue/no-dupe-keys	disallow duplication of field names
	vue/no-duplicate-attributes	disallow duplication of attributes
	vue/no-parsing-error	disallow parsing errors in `<template>`
	vue/no-reserved-keys	disallow overwriting reserved keys
🔧	vue/no-shared-component-data	enforce component's data property to be a function
	vue/no-side-effects-in-computed-properties	disallow side effects in computed properties
	vue/no-template-key	disallow `key` attribute on `<template>`
	vue/no-textarea-mustache	disallow mustaches in `<textarea>`
	vue/no-unused-vars	disallow unused variable definitions of v-for directives or scope attributes
	vue/require-component-is	require `v-bind:is` of `<component>` elements
	vue/require-render-return	enforce render function to always return value
	vue/require-v-for-key	require `v-bind:key` with `v-for` directives
	vue/require-valid-default-prop	enforce props default values to be valid
	vue/return-in-computed-property	enforce that a return statement is present in computed property
	vue/valid-template-root	enforce valid template root
	vue/valid-v-bind	enforce valid `v-bind` directives
	vue/valid-v-cloak	enforce valid `v-cloak` directives
	vue/valid-v-else-if	enforce valid `v-else-if` directives
	vue/valid-v-else	enforce valid `v-else` directives
	vue/valid-v-for	enforce valid `v-for` directives
	vue/valid-v-html	enforce valid `v-html` directives
	vue/valid-v-if	enforce valid `v-if` directives
	vue/valid-v-model	enforce valid `v-model` directives
	vue/valid-v-on	enforce valid `v-on` directives
	vue/valid-v-once	enforce valid `v-once` directives
	vue/valid-v-pre	enforce valid `v-pre` directives
	vue/valid-v-show	enforce valid `v-show` directives
	vue/valid-v-text	enforce valid `v-text` directives

Priority B: Strongly Recommended (Improving Readability)

Enforce all the rules in this category, as well as all higher priority rules, with:

{
  "extends": "plugin:vue/strongly-recommended"
}

	Rule ID	Description
🔧	vue/attribute-hyphenation	enforce attribute naming style in template
🔧	vue/html-end-tags	enforce end tag style
🔧	vue/html-indent	enforce consistent indentation in `<template>`
🔧	vue/html-self-closing	enforce self-closing style
	vue/max-attributes-per-line	enforce the maximum number of attributes per line
🔧	vue/mustache-interpolation-spacing	enforce unified spacing in mustache interpolations
🔧	vue/name-property-casing	enforce specific casing for the name property in Vue components
🔧	vue/no-multi-spaces	disallow multiple spaces
	vue/require-default-prop	require default value for props
	vue/require-prop-types	require type definitions in props
🔧	vue/v-bind-style	enforce `v-bind` directive style
🔧	vue/v-on-style	enforce `v-on` directive style

Priority C: Recommended (Minimizing Arbitrary Choices and Cognitive Overhead)

Enforce all the rules in this category, as well as all higher priority rules, with:

{
  "extends": "plugin:vue/recommended"
}

	Rule ID	Description
🔧	vue/html-quotes	enforce quotes style of HTML attributes
	vue/no-confusing-v-for-v-if	disallow confusing `v-for` and `v-if` on the same element
	vue/order-in-components	enforce order of properties in components
	vue/this-in-template	enforce usage of `this` in template

Uncategorized

	Rule ID	Description
🔧	vue/html-closing-bracket-newline	require or disallow a line break before tag's closing brackets
🔧	vue/html-closing-bracket-spacing	require or disallow a space before tag's closing brackets
🔧	vue/script-indent	enforce consistent indentation in `<script>`

👫 FAQ

What is the "Use the latest vue-eslint-parser" error?

The most rules of eslint-plugin-vue require vue-eslint-parser to check <template> ASTs.

Make sure you have one of the following settings in your .eslintrc:

"extends": ["plugin:vue/recommended"]
"extends": ["plugin:vue/base"]

If you already use other parser (e.g. "parser": "babel-eslint"), please move it into parserOptions, so it doesn't collide with the vue-eslint-parser used by this plugin's configuration:

- "parser": "babel-eslint",
  "parserOptions": {
+     "parser": "babel-eslint",
      "ecmaVersion": 2017,
      "sourceType": "module"
  }

The vue-eslint-parser uses the parser which is set by parserOptions.parser to parse scripts.

Can my javascript code have increased indentation?

It depends on the version of eslint you're using.

indent rule in eslint@3.x makes it possible, but if you use eslint@4.x be aware that this rule has been rewritten and is more strict now, thus it doesn't allow to have increased initial indentation.

You can however use indent-legacy rule instead. More informations here.

⚓ Semantic Versioning Policy

This plugin follows semantic versioning and ESLint's Semantic Versioning Policy.

📰 Changelog

We're using GitHub Releases.

🍻 Contribution guide

In order to add a new rule, you should:

Create issue on GH with description of proposed rule
Generate a new rule using the official yeoman generator
Run npm start
Write test scenarios & implement logic
Describe the rule in the generated docs file
Make sure all tests are passing
Run npm run update in order to update readme and recommended configuration
Create PR and link created issue in description

We're more than happy to see potential contributions, so don't hesitate. If you have any suggestions, ideas or problems feel free to add new issue, but first please make sure your question does not repeat previous ones.

🔒 License

See the LICENSE file for license rights and limitations (MIT).

License

Hornet-Wing/eslint-plugin-vue

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