ESLint Markdown Language Plugin

Lint JS, JSX, TypeScript, and more inside Markdown.

Usage

Installing

Install the plugin alongside ESLint v9 or greater:

npm install --save-dev eslint @eslint/markdown

Configurations

In your eslint.config.js file, import @eslint/markdown and include the recommended config to enable the Markdown processor on all .md files:

// eslint.config.js
import markdown from "@eslint/markdown";

export default [
    ...markdown.configs.recommended

    // your other configs here
];

Rules

Note: This plugin does not provide formatting rules. We recommend using a source code formatter such as Prettier for that purpose.

In order to individually configure a rule in your eslint.config.js file, import @eslint/markdown and configure each rule with a prefix:

// eslint.config.js
import markdown from "@eslint/markdown";

export default [
    {
        files: ["**/*.md"],
        plugins: {
            markdown
        },
        language: "markdown/commonmark",
        rules: {
            "markdown/no-html": "error"
        }
    }
];

You can individually disable rules in Markdown using HTML comments, such as:

<!-- eslint-disable-next-line markdown/no-html -- I want to allow HTML here -->
<custom-element>Hello world!</custom-element>

<!-- eslint-disable markdown/no-html -- here too -->
<another-element>Goodbye world!</another-element>
<!-- eslint-enable markdown/no-html -- safe to re-enable now -->

[Object] <!-- eslint-disable-line markdown/no-missing-label-refs -- not meant to be a link ref -->

Languages

In order to individually configure a language in your eslint.config.js file, import @eslint/markdown and configure a language:

// eslint.config.js
import markdown from "@eslint/markdown";

export default [
    {
        files: ["**/*.md"],
        plugins: {
            markdown
        },
        language: "markdown/gfm",
        rules: {
            "markdown/no-html": "error"
        }
    }
];

Processors

Editor Integrations

VSCode

vscode-eslint has built-in support for the Markdown processor.

Atom

The linter-eslint package allows for linting within the Atom IDE.

In order to see @eslint/markdown work its magic within Markdown code blocks in your Atom editor, you can go to linter-eslint's settings and within "List of scopes to run ESLint on...", add the cursor scope "source.gfm".

However, this reports a problem when viewing Markdown which does not have configuration, so you may wish to use the cursor scope "source.embedded.js", but note that @eslint/markdown configuration comments and skip directives won't work in this context.

File Name Details

This processor will use file names from blocks if a filename meta is present.

For example, the following block will result in a parsed file name of src/index.js:

```js filename="src/index.js"
export const value = "Hello, world!";
```

This can be useful for user configurations that include linting overrides for specific file paths. In this example, you could then target the specific code block in your configuration using "file-name.md/*src/index.js".

Contributing

$ git clone https://github.com/eslint/markdown.git
$ cd markdown
$ npm install
$ npm test

This project follows the ESLint contribution guidelines.

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