astro-eslint-parser

Astro parser for ESLint.
You can check it on Online DEMO.

This parser is in the experimental stages of development.

⚠ Currently this parser relies heavily on the internal API of @astrojs/compiler. It may stop working in a future update of @astrojs/compiler. ⚠

💿 Installation

npm install --save-dev eslint astro-eslint-parser

📖 Usage

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

{
    "extends": "eslint:recommended",
    "overrides": [
        {
            "files": ["*.astro"],
            "parser": "astro-eslint-parser"
        }
    ]
}

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

🔧 Options

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

{
    "parser": "astro-eslint-parser",
    "parserOptions": {
        "sourceType": "module",
        "ecmaVersion": 2021,
        "ecmaFeatures": {
            "globalReturn": false,
            "impliedStrict": false,
            "jsx": false
        }
    }
}

parserOptions.parser

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

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

For example, if you are using the "@typescript-eslint/parser", and if you want to use TypeScript in .astro, you need to add more parserOptions configuration.

module.exports = {
  // ...
  parser: "@typescript-eslint/parser",
  parserOptions: {
    // ...
    project: "path/to/your/tsconfig.json",
    extraFileExtensions: [".astro"], // This is a required setting in `@typescript-eslint/parser` v5.
  },
  overrides: [
    {
      files: ["*.astro"],
      parser: "astro-eslint-parser",
      // Parse the script in `.astro` as TypeScript by adding the following configuration.
      parserOptions: {
        parser: "@typescript-eslint/parser",
      },
    },
    // ...
  ],
  // ...
}

💻 Editor Integrations

Visual Studio Code

Use the dbaeumer.vscode-eslint extension that Microsoft provides officially.

You have to configure the eslint.validate option of the extension to check .astro files, because the extension targets only *.js or *.jsx files by default.

Example .vscode/settings.json:

{
    "eslint.validate": [
        "javascript",
        "javascriptreact",
        "astro"
    ]
}

Compatibility With Existing ESLint Rules

Most of the rules in the ESLint core work for the script part, but some rules are incompatible.
This parser will generate a JSX compatible AST for most of the HTML part of the Astro component. Therefore, some rules of eslint-plugin-react may work. For example, the react/jsx-no-target-blank rule works fine.

Usage for Custom Rules / Plugins

• TBA
• You can check the AST in the Online DEMO. However, AST is subject to major changes in the future.

🍻 Contributing

Welcome contributing!

Please use GitHub's Issues/PRs.

🔒 License

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