If you’re working with HTML files containing inline scripts, you might want a handy tool to ensure that your JavaScript code is clean and adheres to best practices. Enter eslint-plugin-html, a plugin specifically designed to lint and fix inline scripts in HTML files. This blog post will guide you through its setup, usage, and provide troubleshooting tips!

Table of Contents

• Usage
• Disabling ESLint
• Linting HTML
• Multiple Scripts Tags in an HTML File
• History
• XML Support
• Settings
• Troubleshooting

Usage

To start using this plugin, you’ll need to install it via npm. You can do this by running:

npm install --save-dev eslint-plugin-html

Then, add the plugin to your ESLint configuration file. Here’s a sample setup:

import html from "eslint-plugin-html";

export default [
    files: ["*.html"],
    plugins: ["html"],
];

Disabling ESLint

If you find that you need to disable ESLint temporarily for specific sections of your inline scripts, you can easily do so using comments:

Linting HTML

The plugin focuses on applying ESLint rules specifically on inline scripts within HTML files. For other HTML-related linting, consider using additional plugins like @eslint-html or @angular-eslint.

Multiple Scripts Tags in an HTML File

When you have multiple script tags in an HTML file, the plugin emulates the browser by sharing the global scope between scripts. However, for module scripts, each script gets its separate scope. This behavior can be configured easily within your ESLint configuration as follows:

export default [
    languageOptions: {
        sourceType: "module",
    },
];

This helps determine how the scripts should share variable scopes.

History

The plugin has undergone several updates, enhancing its functionality and ensuring that scripts are linted separately since version 3. Version 4 adds more flexibility regarding scope sharing between scripts.

XML Support

Unlike HTML, the plugin parses XML markup slightly differently, particularly with CDATA sections. This is important if you’re working with XML files alongside HTML.

Settings

Various settings can be fine-tuned to suit your project, including:

• html-extensions: Specify additional file extensions that should be recognized as HTML.
• html-indent: Set the level of indentation for code within script tags.
• html-report-bad-indent: Configure how linting handles indentation warnings and errors.
• html-javascript-tag-names: Customize which tags should be treated as JavaScript.

Troubleshooting

Sometimes things might not work as expected. Here are some common issues and solutions:

• No file linted when running ESLint on a directory: You must specify file extensions explicitly using the –ext option. For example:

  eslint --ext .html,.js src

• Linting templates (or PHP): If you have template syntax within your scripts, ESLint may fail to parse them correctly. You can disable ESLint for specific tags using comments or use alternatives like eslint-plugin-php-markup for PHP files.
• Linting VUE files: Due to changes in linting approaches, consider using eslint-plugin-vue exclusively for VUE files.

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