eslint-doc-generator

eslint-doc-generator

Automatic documentation generator for ESLint plugins and rules.

Generates the following documentation based on ESLint and top ESLint plugin conventions:

• README.md rules table
• Rule doc titles and notices

Also performs some basic section consistency checks on rule docs:

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

Motivation

• 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 new rules by automating part of the documentation
• Eliminate the custom documentation scripts and tests previously built and maintained by many ESLint plugins

Setup

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) (add any config options in the update:eslint-docs script):

{
  "scripts": {
    "lint": "npm-run-all \"lint:*\"",
    "lint:docs": "markdownlint \"**/*.md\"",
    "lint:eslint-docs": "npm-run-all \"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 rules list -->
<!-- end rules 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 exist yet).

Usage

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

Example

Generated content in a rule doc (everything above the marker comment) (intentionally showing all possible notices):

# Disallow using foo (`test/no-foo`)

✅ This rule is enabled in the `recommended` config.

💼 This rule is enabled in the following configs: ✅ `recommended`, 🎨 `stylistic`.

🔧 This rule is automatically fixable by the [`--fix` CLI option](https://eslint.org/docs/user-guide/command-line-interface#--fix).

💡 This rule is manually fixable by [editor suggestions](https://eslint.org/docs/developer-guide/working-with-rules#providing-suggestions).

💭 This rule requires type information.

❗ This rule identifies problems that could cause errors or unexpected behavior.

📖 This rule identifies potential improvements.

📏 This rule focuses on code formatting.

❌ This rule is deprecated. It was replaced by [prefer-bar](prefer-bar.md).

<!-- end rule header -->

Description.

## Examples

Examples.

...

Generated rules table in README.md (everything between the marker comments) (intentionally showing all possible columns):

# eslint-plugin-test

## Rules

<!-- begin rules list -->

💼 Configurations enabled in.\
✅ Enabled in the `recommended` configuration.\
🎨 Enabled in the `stylistic` configuration.\
🔧 Automatically fixable by the [`--fix` CLI option](https://eslint.org/docs/user-guide/command-line-interface#--fix).\
💡 Manually fixable by [editor suggestions](https://eslint.org/docs/developer-guide/working-with-rules#providing-suggestions).\
💭 Requires type information.\
🗂️ The type of rule.\
❗ Identifies problems that could cause errors or unexpected behavior.\
📖 Identifies potential improvements.\
📏 Focuses on code formatting.\
❌ Deprecated.

| Name                                     | Description        | 💼    | 🔧  | 💡  | 💭  | 🗂️  | ❌  |
| :--------------------------------------- | :----------------- | :---- | :-- | :-- | :-- | :-- | :-- |
| [no-foo](docs/rules/no-foo.md)           | disallow using foo | ✅    | 🔧  |     |     | ❗  |     |
| [prefer-bar](docs/rules/prefer-bar.md)   | enforce using bar  | ✅ 🎨 |     | 💡  | 💭  | 📖  |     |
| [require-baz](docs/rules/require-baz.md) | require using baz  |       | 🔧  |     |     | 📏  | ❌  |

<!-- end rules list -->

...

The table will hide columns that don't apply to any rules, and the legend will include only the symbols that are used in the table.

Badge

For any configs without emojis (see --config-emoji), you'll need to define badges for them at the bottom of your README.md.

Here's a badge for a custom fun config that displays in blue:

[fun]: https://img.shields.io/badge/-fun-blue.svg

And how it looks:

Configuration options

Name	Description
--check	Whether to check for and fail if there is a diff. No output will be written. Typically used during CI.
--config-emoji	Custom emoji to use for a config. Format is config-name,emoji. Default emojis are provided for common configs. To remove a default emoji and rely on a badge instead, provide the config name without an emoji. Option can be repeated.
--ignore-config	Config to ignore from being displayed. Often used for an all config. Option can be repeated.
--ignore-deprecated-rules	Whether to ignore deprecated rules from being checked, displayed, or updated (default: false).
--rule-doc-notices	Ordered, comma-separated list of notices to display in rule doc. Non-applicable notices will be hidden. Choices: configs, deprecated, fixable, hasSuggestions, requiresTypeChecking, type (off by default). Default: deprecated,configs,fixable,hasSuggestions,requiresTypeChecking.
--rule-doc-section-exclude	Disallowed section in each rule doc. Exit with failure if present. Option can be repeated.
--rule-doc-section-include	Required section in each rule doc. Exit with failure if missing. Option can be repeated.
--rule-doc-title-format	The format to use for rule doc titles. Defaults to desc-parens-prefix-name. See choices in below table.
--rule-list-columns	Ordered, comma-separated list of columns to display in rule list. Empty columns will be hidden. Choices: configs, deprecated, description, fixable, hasSuggestions, name, requiresTypeChecking, type (off by default). Default: name,description,configs,fixable,hasSuggestions,requiresTypeChecking,deprecated.
--url-configs	Link to documentation about the ESLint configurations exported by the plugin.

All options are optional.

--rule-doc-title-format

Where no-foo is the rule name, Do not use foo is the rule description, and eslint-plugin-test is the plugin name.

Value	Example
desc	# Do not use foo
desc-parens-name	# Do not use foo (no-foo)
desc-parens-prefix-name (default)	# Do not use foo (test/no-foo)
name	# no-foo
prefix-name	# test/no-foo

Related

• 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

Changelog

v0.12.0 (2022-10-19)

:rocket: Enhancement

• #139 Add --rule-doc-notices option (@bmish)
• #136 Add default emojis for common configs (@bmish)
• #134 Add optional column and notice for rule type (@bmish)
• #137 Support removing the default emoji for a config with --config-emoji option (@bmish)

:bug: Bug Fix

• #147 Hide ignored configs from rule list legend (@bmish)
• #140 Handle plugins using exports in package.json (@bmish)

:memo: Documentation

• #130 Add motivation section to README (@bmish)

Committers: 1

• Bryan Mishkin (@bmish)