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bmish/eslint-doc-generator: Automatic documentation generator for ESLint plugins and rules.

Automatic documentation generator for ESLint plugins and rules. Inspired by documentation conventions from ESLint and top ESLint plugins.

Generates the following documentation covering a wide variety of rule metadata:

• README.md rules table
• README.md configs table
• Rule doc titles and notices
• Rule doc options lists

Also performs configurable section consistency checks on rule docs:

• Contains an ## Options or ## Config section and mentions each named option (for rules with options)

• Motivation
• Setup
  • Scripts
  • Update README.md
  • Update rule docs
  • Configure linting
• Usage
• Examples
  • Rules list table
  • Configs list table
  • Rule doc notices
  • Rule doc options lists
  • Users
• Configuration options
  • Column and notice types
  • --config-format
  • --rule-doc-title-format
  • Configuration file
  • Badges
• Compatibility
  • Build tools
  • markdownlint
  • prettier
• Semantic versioning policy
• Related

• Standardize documentation across thousands of ESLint plugins and rules
• Improve the discoverability of key rule information and thus rule usability
• Streamline the process of adding/updating rules while ensuring documentation is kept up-to-date
• Eliminate the custom documentation scripts and tests previously built and maintained by many ESLint plugins

Install it:

npm i --save-dev eslint-doc-generator

Add scripts to package.json:

• Both a lint script to ensure everything is up-to-date in CI and an update script for contributors to run locally
• Add any config options in the update:eslint-docs script only (or use a config file)
• Alternative scripts may be needed with build tools, markdownlint, or prettier

{
  "scripts": {
    "lint": "npm-run-all \"lint:*\"",
    "lint:docs": "markdownlint \"**/*.md\"",
    "lint:eslint-docs": "npm run update:eslint-docs -- --check",
    "lint:js": "eslint .",
    "update:eslint-docs": "eslint-doc-generator"
  }
}

Delete any old rules list from your README.md. A new one will be automatically added to your ## Rules section (along with the following marker comments if they don't already exist):

<!-- begin auto-generated rules list -->
<!-- end auto-generated rules list -->

Optionally, add these marker comments to your README.md in a ## Configs section or similar location (uses the meta.docs.description property exported by each config if available):

<!-- begin auto-generated configs list -->
<!-- end auto-generated configs list -->

Delete any old recommended/fixable/etc. notices from your rule docs. A new title and notices will be automatically added to the top of each rule doc (along with a marker comment if it doesn't already exist).

<!-- end auto-generated rule header -->

Optionally, add these marker comments to your rule docs in an ## Options section or similar location:

<!-- begin auto-generated rule options list -->
<!-- end auto-generated rule options list -->

Note that rule option lists are subject-to-change as we add support for more kinds and properties of schemas. To fully take advantage of them, you'll want to ensure your rules have the meta.schema property fleshed out with properties like description, type, enum, default, required, deprecated.

And be sure to enable the recommended rules from eslint-plugin-eslint-plugin as well as:

• eslint-plugin/require-meta-docs-description to ensure your rules have consistent descriptions for use in the generated docs
• eslint-plugin/require-meta-docs-url to ensure your rule docs are linked to by editors on highlighted violations
• eslint-plugin/require-meta-schema to ensure your rules have schemas for use in determining options

Run the script from package.json to start out or any time you add a rule or update rule metadata in your plugin:

npm run update:eslint-docs

For examples, see our users or the in-house examples below. Note that the in-house examples intentionally show all possible columns and notices.

See the generated rules table and legend in our example README.md.

See the generated configs table in our example README.md.

See the generated rule doc title and notices in our example rule docs no-foo.md, prefer-bar.md, require-baz.md.

See the generated rule doc options lists in our example rule doc no-foo.md.

This tool is used by popular ESLint plugins like:

• eslint-plugin-ava
• eslint-plugin-ember
• eslint-plugin-eslint-plugin
• eslint-plugin-import
• eslint-plugin-jest
• eslint-plugin-jsx-a11y
• eslint-plugin-promise
• eslint-plugin-qunit
• eslint-plugin-react
• eslint-plugin-unicorn

These can be provided as CLI options or as config file options. All options are optional.

The CLI has an optional path argument if you need to point the CLI to an ESLint plugin directory that isn't just the current directory:

eslint-doc-generator path/to/eslint-plugin

There's also a postprocess option that's only available via a config file.

These are the types of rule metadata that are available for display in rule list columns (--rule-list-columns) and/or rule doc notices (--rule-doc-notices).

Where recommended is the config name and eslint-plugin-test is the plugin name.

Where no-foo is the rule name, Disallow use of foo is the rule description, and eslint-plugin-test is the plugin name.

There are a few ways to create a config file (as an alternative to passing the options via CLI):

• An object exported by .eslint-doc-generatorrc.js, .eslint-doc-generatorrc.json, or any other config file format/name supported by cosmiconfig
• An object under the eslint-doc-generator key in package.json

Config files support all the CLI options but in camelCase.

Some options are exclusive to a JavaScript-based config file:

• postprocess - A function-only option useful for applying custom transformations such as formatting with tools like prettier. See prettier example.
• ruleListSplit with a function - This is useful for customizing the grouping of rules into lists.

Example .eslint-doc-generatorrc.js:

/** @type {import('eslint-doc-generator').GenerateOptions} */
const config = {
  ignoreConfig: ['all'],
};

module.exports = config;

Example .eslint-doc-generatorrc.js with pathRuleDoc function:

/** @type {import('eslint-doc-generator').GenerateOptions} */
const config = {
  pathRuleDoc(name) {
    // e.g. rule name format is `some-plugin/some-rule`, and rule is in a monorepo under different package.
    const [plugin, rule] = name.split("/");
    return `packages/eslint-plugin-${plugin}/src/rules/${rule}.md`;
  },
};

module.exports = config;

Example .eslint-doc-generatorrc.js with ruleListSplit function:

/** @type {import('eslint-doc-generator').GenerateOptions} */
const config = {
  ruleListSplit(rules) {
    return [
      {
        // No header for this list.
        rules: rules.filter(([name, rule]) => !rule.meta.someProp),
      },
      {
        title: 'Foo',
        rules: rules.filter(([name, rule]) => rule.meta.someProp === 'foo'),
      },
      {
        title: 'Bar',
        rules: rules.filter(([name, rule]) => rule.meta.someProp === 'bar'),
      },
    ];
  },
};

module.exports = config;

Example .eslint-doc-generatorrc.js with urlRuleDoc function:

/** @type {import('eslint-doc-generator').GenerateOptions} */
const config = {
  urlRuleDoc(name, page) {
    if (page === 'README.md') {
      // Use URLs only in the readme.
      return `https://example.com/rules/${name}.html`;
    }
  },
};

module.exports = config;

While emojis are the recommended representations of configs that a rule belongs to, you can alternatively use a text/image/icon badge for configs by supplying the following markdown for the emoji using the --config-emoji option.

For example, here's the markdown for a text badge representing a custom fun config that displays in blue (note that the markdown includes alt text followed by the image URL):

![fun config badge](https://img.shields.io/badge/-fun-blue.svg)

Here's how you'd configure it:

/** @type {import('eslint-doc-generator').GenerateOptions} */
const config = {
  configEmoji: [
    ['fun', '![fun config badge](https://img.shields.io/badge/-fun-blue.svg)'],
  ],
};

module.exports = config;

And how it looks:

If you have a build step for your code like Babel or TypeScript, you may need to adjust your scripts to run your build before this tool to ensure the documentation is generated from the latest plugin information:

{
  "build": "tsc",
  "update:eslint-docs": "npm run build && eslint-doc-generator"
}

The output of this tool should be compatible with the default configuration of markdownlint, which you might use to lint your markdown. If it's not, you can follow the prettier example to tweak your scripts or use the postprocess option. See the markdownlint documentation for an example of markdownlint's Node API for applying fixes to use in your postprocess function.

If you use prettier to format your markdown, you can provide a postprocess function to ensure the documentation generated by this tool is formatted correctly:

const prettier = require('prettier');
const { prettier: prettierRC } = require('./package.json'); // or wherever your prettier config lies

/** @type {import('eslint-doc-generator').GenerateOptions} */
const config = {
  postprocess: (content, path) =>
    prettier.format(content, { ...prettierRC, parser: 'markdown' }),
};

module.exports = config;

Alternatively, you can configure your scripts to run prettier after this tool:

{
  "format": "prettier --write .",
  "lint:eslint-docs": "npm run update:eslint-docs && git diff --exit-code",
  "update:eslint-docs": "eslint-doc-generator && npm run format"
}

This tool follows semantic versioning.

New features will be released as a minor version, while bug fixes will be released as a patch version.

Breaking changes will be released as a major version and include:

• Changing an option default
• Renaming or removing an option
• Other backwards-incompatible changes to the CLI / API
• Raising Node or ESLint version requirements

Tweaks to the generated documentation output can take place in any type of release including minor and patch versions. This can break your build, as even a small formatting change will cause a diff, but you can simply re-run the tool to fix.

• eslint-plugin-eslint-plugin - Linter for ESLint plugins (related list)
• generator-eslint - Generates initial ESLint plugin and rule files but without the sophisticated documentation provided by eslint-doc-generator

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