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# vue-eslint-parser

[![npm version](https://img.shields.io/npm/v/vue-eslint-parser.svg)](https://www.npmjs.com/package/vue-eslint-parser)
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[![Dependency Status](https://david-dm.org/vuejs/vue-eslint-parser.svg)](https://david-dm.org/vuejs/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](https://github.com/vuejs/eslint-plugin-vue) would catch some of the mistakes.

## 💿 Installation

```bash
$ 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

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

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

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

## 🔧 Options

`parserOptions` has the same properties as what [espree](https://github.com/eslint/espree#usage), the default parser of ESLint, is supporting.
For example:

```json
{
    "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:

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

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

You can also specify an object and change the parser separately for `<script lang="...">`.

```jsonc
{
    "parser": "vue-eslint-parser",
    "parserOptions": {
        "parser": {
             // Script parser for `<script>`
            "js": "espree",

             // Script parser for `<script lang="ts">`
            "ts": "@typescript-eslint/parser",

             // Script parser for vue directives (e.g. `v-if=` or `:attribute=`)
             // and vue interpolations (e.g. `{{variable}}`).
             // If not specified, the parser determined by `<script lang ="...">` is used.
            "<template>": "espree",
        }
    }
}
```

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.

### parserOptions.vueFeatures

You can use `parserOptions.vueFeatures` property to specify how to parse related to Vue features.
For example:

```json
{
    "parser": "vue-eslint-parser",
    "parserOptions": {
        "vueFeatures": {
            "filter": true,
            "interpolationAsNonHTML": false,
            "styleCSSVariableInjection": true,
        }
    }
}
```

### parserOptions.vueFeatures.filter

You can use `parserOptions.vueFeatures.filter` property to specify whether to parse the Vue2 filter. If you specify `false`, the parser does not parse `|` as a filter.
For example:

```json
{
    "parser": "vue-eslint-parser",
    "parserOptions": {
        "vueFeatures": {
            "filter": false
        }
    }
}
```

If you specify `false`, it can be parsed in the same way as Vue 3.
The following template parses as a bitwise operation.

```vue
<template>
  <div>{{ a | b }}</div>
</template>
```

However, the following template that are valid in Vue 2 cannot be parsed.

```vue
<template>
  <div>{{ a | valid:filter }}</div>
</template>
```

### parserOptions.vueFeatures.interpolationAsNonHTML

You can use `parserOptions.vueFeatures.interpolationAsNonHTML` property to specify whether to parse the interpolation as HTML. If you specify `true`, the parser handles the interpolation as non-HTML (However, you can use HTML escaping in the interpolation).
For example:

```json
{
    "parser": "vue-eslint-parser",
    "parserOptions": {
        "vueFeatures": {
            "interpolationAsNonHTML": true
        }
    }
}
```

If you specify `true`, it can be parsed in the same way as Vue 3.
The following template can be parsed well.

```vue
<template>
  <div>{{a<b}}</div>
</template>
```

But, it cannot be parsed with Vue 2.

### parserOptions.vueFeatures.styleCSSVariableInjection

If set to `true`, to parse expressions in `v-bind` CSS functions inside `<style>` tags. `v-bind()` is parsed into the `VExpressionContainer` AST node and held in the `VElement` of `<style>`. Default is `true`.

See also to [here](https://github.com/vuejs/rfcs/blob/master/active-rfcs/0043-sfc-style-variables.md).

## 🎇 Usage for custom rules / plugins

- This parser provides `parserServices` to traverse `<template>`.
    - `defineTemplateBodyVisitor(templateVisitor, scriptVisitor, options)` ... returns ESLint visitor to traverse `<template>`.
    - `getTemplateBodyTokenStore()` ... returns ESLint `TokenStore` to get the tokens of `<template>`.
    - `getDocumentFragment()` ... returns the root `VDocumentFragment`.
    - `defineCustomBlocksVisitor(context, customParser, rule, scriptVisitor)` ... returns ESLint visitor that parses and traverses the contents of the custom block.
    - `defineDocumentVisitor(documentVisitor, options)` ... returns ESLint visitor to traverses the document.
- [ast.md](./docs/ast.md) is `<template>` AST specification.
- [mustache-interpolation-spacing.js](https://github.com/vuejs/eslint-plugin-vue/blob/b434ff99d37f35570fa351681e43ba2cf5746db3/lib/rules/mustache-interpolation-spacing.js) is an example.

### `defineTemplateBodyVisitor(templateBodyVisitor, scriptVisitor, options)`

*Arguments*

- `templateBodyVisitor` ... Event handlers for `<template>`.
- `scriptVisitor` ... Event handlers for `<script>` or scripts. (optional)
- `options` ... Options. (optional)
  - `templateBodyTriggerSelector` ... Script AST node selector that triggers the templateBodyVisitor. Default is `"Program:exit"`. (optional)

```ts
import { AST } from "vue-eslint-parser"

export function create(context) {
    return context.parserServices.defineTemplateBodyVisitor(
        // Event handlers for <template>.
        {
            VElement(node: AST.VElement): void {
                //...
            }
        },
        // Event handlers for <script> or scripts. (optional)
        {
            Program(node: AST.ESLintProgram): void {
                //...
            }
        },
        // Options. (optional)
        {
            templateBodyTriggerSelector: "Program:exit"
        }
    )
}
```

## ⚠️ Known Limitations

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

- [eol-last](http://eslint.org/docs/rules/eol-last)
- [linebreak-style](http://eslint.org/docs/rules/linebreak-style)
- [max-len](http://eslint.org/docs/rules/max-len)
- [max-lines](http://eslint.org/docs/rules/max-lines)
- [no-trailing-spaces](http://eslint.org/docs/rules/no-trailing-spaces)
- [unicode-bom](http://eslint.org/docs/rules/unicode-bom)
- Other rules which are using the source code text instead of AST might be confused as well.

## 📰 Changelog

- [GitHub Releases](https://github.com/vuejs/vue-eslint-parser/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.

Anon7 - 2022
AnonSec Team