vue-eslint-parser

The ESLint custom parser for .vue files.

⤴️ Motivation

This parser allows us to lint the <template> of .vue files. We can make mistakes easily on <template> if we use complex directives and expressions in the template. This parser and the rules of eslint-plugin-vue would catch some of the mistakes.

💿 Installation

$ npm install --save-dev eslint vue-eslint-parser

Requires Node.js 6.5.0 or later.
Requires ESLint 5.0.0 or later.
Requires babel-eslint 8.1.1 or later if you want it. (optional)
Requires @typescript-eslint/parser 1.0.0 or later if you want it. (optional)

📖 Usage

Write parser option into your .eslintrc.* file.
Use glob patterns or --ext .vue CLI option.

{
    "extends": "eslint:recommended",
    "parser": "vue-eslint-parser"
}

$ eslint "src/**/*.{js,vue}"
# or
$ eslint src --ext .vue

🔧 Options

parserOptions has the same properties as what espree, the default parser of ESLint, is supporting. For example:

{
    "parser": "vue-eslint-parser",
    "parserOptions": {
        "sourceType": "module",
        "ecmaVersion": 2018,
        "ecmaFeatures": {
            "globalReturn": false,
            "impliedStrict": false,
            "jsx": false
        }
    }
}

parserOptions.parser

You can use parserOptions.parser property to specify a custom parser to parse <script> tags. Other properties than parser would be given to the specified parser. For example:

{
    "parser": "vue-eslint-parser",
    "parserOptions": {
        "parser": "babel-eslint",
        "sourceType": "module",
        "allowImportExportEverywhere": false
    }
}

{
    "parser": "vue-eslint-parser",
    "parserOptions": {
        "parser": "@typescript-eslint/parser"
    }
}

If the parserOptions.parser is false, the vue-eslint-parser skips parsing <script> tags completely. This is useful for people who use the language ESLint community doesn't provide custom parser implementation.

🎇 Usage for custom rules / plugins

This parser provides parserServices to traverse <template>.
- defineTemplateBodyVisitor(templateVisitor, scriptVisitor) ... returns ESLint visitor to traverse <template>.
- getTemplateBodyTokenStore() ... returns ESLint TokenStore to get the tokens of <template>.
- getDocumentFragment() ... returns the root VDocumentFragment.
ast.md is <template> AST specification.
mustache-interpolation-spacing.js is an example.

⚠️ Known Limitations

Some rules make warnings due to the outside of <script> tags. Please disable those rules for .vue files as necessary.

eol-last
linebreak-style
max-len
max-lines
no-trailing-spaces
unicode-bom
Other rules which are using the source code text instead of AST might be confused as well.

📰 Changelog

GitHub Releases

🍻 Contributing

Welcome contributing!

Please use GitHub's Issues/PRs.

If you want to write code, please execute npm install && npm run setup after you cloned this repository. The npm install command installs dependencies. The npm run setup command initializes ESLint as git submodules for tests.

Development Tools

npm test runs tests and measures coverage.
npm run build compiles TypeScript source code to index.js, index.js.map, and index.d.ts.
npm run coverage shows the coverage result of npm test command with the default browser.
npm run clean removes the temporary files which are created by npm test and npm run build.
npm run lint runs ESLint.
npm run setup setups submodules to develop.
npm run update-fixtures updates files in test/fixtures/ast directory based on test/fixtures/ast/*/source.vue files.
npm run watch runs build, update-fixtures, and tests with --watch option.

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