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# eslint-plugin-vue
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[](https://npmjs.org/package/eslint-plugin-vue)
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[](https://npmjs.org/package/eslint-plugin-vue)
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[](https://circleci.com/gh/vuejs/eslint-plugin-vue)
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[](https://github.com/vuejs/eslint-plugin-vue/blob/master/LICENSE)
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> Official ESLint plugin for Vue.js
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## :book: Documentation
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Please refer to the [official website](https://eslint.vuejs.org).
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## :anchor: Versioning Policy
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This plugin follows [Semantic Versioning](https://semver.org) and [ESLint's Semantic Versioning Policy](https://github.com/eslint/eslint#semantic-versioning-policy).
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## :newspaper: Releases
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This project uses [GitHub Releases](https://github.com/vuejs/eslint-plugin-vue/releases).
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## :beers: Contribution Guide
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Contributing is welcome! See the [ESLint Vue Plugin Developer Guide](https://eslint.vuejs.org/developer-guide).
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### Working With Rules
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Be sure to read the [official ESLint guide](https://eslint.org/docs/developer-guide/working-with-rules) before you start writing a new rule.
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To see what an abstract syntax tree (AST) of your code looks like, you may use [AST Explorer](https://astexplorer.net). After opening [AST Explorer](https://astexplorer.net), select `Vue` as the syntax and `vue-eslint-parser` as the parser.
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The default JavaScript parser must be replaced because [Vue.js single file components](https://vuejs.org/guide/scaling-up/sfc.html) are not plain JavaScript, but a custom file format. [`vue-eslint-parser`](https://github.com/vuejs/vue-eslint-parser) is a replacement parser that generates an enhanced AST with nodes that represent specific parts of the template syntax, as well as the contents of the `<script>` tag.
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To learn more about certain nodes in a produced AST, see the [ESTree project page](https://github.com/estree/estree) and the [vue-eslint-parser AST documentation](https://github.com/vuejs/vue-eslint-parser/blob/master/docs/ast.md).
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`vue-eslint-parser` provides a few useful parser services to help traverse the produced AST and access template tokens:
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- `context.parserServices.defineTemplateBodyVisitor(visitor, scriptVisitor)`
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- `context.parserServices.getTemplateBodyTokenStore()`
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Check out an [example rule](https://github.com/vuejs/eslint-plugin-vue/blob/master/lib/rules/mustache-interpolation-spacing.js) to see usage of these services.
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Be aware that depending on the code samples you write in tests, the `RuleTester` parser property must be set accordingly (this can be done on a test by test basis). See an [example here](https://github.com/vuejs/eslint-plugin-vue/blob/master/tests/lib/rules/attribute-hyphenation.js#L19).
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If you're stuck, remember there are many rules available for reference. If you can't find the right solution, don't hesitate to reach out in [issues](https://github.com/vuejs/eslint-plugin-vue/issues) – we're happy to help!
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## :lock: License
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See the [LICENSE](LICENSE) file for license rights and limitations (MIT).
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