55 lines
3.2 KiB
Markdown
55 lines
3.2 KiB
Markdown
# 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.md)
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> Official ESLint plugin for Vue.js
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## :book: Documentation
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See [the official website](https://eslint.vuejs.org).
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## :anchor: Versioning Policy
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This plugin is following [Semantic Versioning](https://semver.org/) and [ESLint's Semantic Versioning Policy](https://github.com/eslint/eslint#semantic-versioning-policy).
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## :newspaper: Changelog
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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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Contribution is welcome!
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See [The ESLint Vue Plugin Developer Guide](https://eslint.vuejs.org/developer-guide/).
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### Working with Rules
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Before you start writing a new rule, please read [the official ESLint guide](https://eslint.org/docs/developer-guide/working-with-rules).
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Next, in order to get an idea how does the AST of the code that you want to check looks like, use one of the following applications:
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- [astexplorer.net](https://astexplorer.net/) - the best tool to inspect ASTs, but it doesn't support Vue template yet
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- [ast.js.org](https://ast.js.org/) - not fully featured, but supports Vue template syntax
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Since single file components in Vue are not plain JavaScript, the default parser couldn't be used, so a new one was introduced. `vue-eslint-parser` generates enhanced AST with nodes that represent specific parts of the template syntax, as well as what's inside the `<script>` tag.
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To know more about certain nodes in produced ASTs, go here:
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- [ESTree docs](https://github.com/estree/estree)
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- [vue-eslint-parser AST docs](https://github.com/mysticatea/vue-eslint-parser/blob/master/docs/ast.md)
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The `vue-eslint-parser` provides a few useful parser services that help traverse the produced AST and access tokens of the template:
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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 get a better understanding of how these work.
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Please be aware that regarding what kind of code examples you'll write in tests, you'll have to accordingly set up the parser in `RuleTester` (you can do it on a per test case 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'll stuck, remember there are plenty of rules you can learn from already. 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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