eslint-plugin-yml

What is eslint-plugin-yml?

eslint-plugin-yml is an ESLint plugin that provides linting rules for YAML files. It helps ensure consistency and correctness in YAML files by enforcing specific coding standards and best practices.

What are eslint-plugin-yml's main functionalities?

Indentation

This rule enforces consistent indentation in YAML files. The example configuration sets the indentation to 2 spaces.

module.exports = {
  'yml/indent': ['error', 2]
};

Key Sorting

This rule enforces sorted keys within YAML mappings. The example configuration sorts keys in ascending order, case-insensitively, and using natural sort order.

module.exports = {
  'yml/sort-keys': ['error', 'asc', { 'caseSensitive': false, 'natural': true }]
};

No Empty Mapping Values

This rule disallows empty values in YAML mappings. The example configuration treats any empty mapping value as an error.

module.exports = {
  'yml/no-empty-mapping-value': 'error'
};

Other packages similar to eslint-plugin-yml

yaml-lint

yaml-lint is a simple linter for YAML files that checks for syntax errors. Unlike eslint-plugin-yml, it does not integrate with ESLint and offers fewer customization options.

README

Introduction

eslint-plugin-yml is ESLint plugin provides linting rules for YAML.

Features

This ESLint plugin provides linting rules for YAML.

• You can use ESLint to lint YAML.
• You can find out the problem with your YAML files.
• Supports Vue SFC custom blocks such as <i18n lang="yaml">.
  Requirements vue-eslint-parser v7.3.0 and above.
• Supports ESLint directives. e.g. # eslint-disable-next-line
• You can check your code in real-time using the ESLint editor integrations.

You can check on the Online DEMO.

Documentation

See documents.

Installation

npm install --save-dev eslint eslint-plugin-yml

Requirements

• ESLint v6.0.0 and above
• Node.js v8.10.0 and above

Usage

Configuration

Use .eslintrc.* file to configure rules. See also: https://eslint.org/docs/user-guide/configuring.

Example .eslintrc.js:

module.exports = {
  extends: [
    // add more generic rulesets here, such as:
    // 'eslint:recommended',
    'plugin:yml/recommended'
  ],
  rules: {
    // override/add rules settings here, such as:
    // 'yml/rule-name': 'error'
  }
}

This plugin provides configs:

• plugin:yml/base ... Configuration to enable correct YAML parsing.
• plugin:yml/recommended ... Recommended configuration.

See the rule list to get the rules that this plugin provides.

Running ESLint from the command line

If you want to run eslint from the command line, make sure you include the .yaml extension using the --ext option or a glob pattern, because ESLint targets only .js files by default.

Examples:

eslint --ext .js,.yaml,.yml src
eslint "src/**/*.{js,yaml,yml}"

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 .yaml files, because the extension targets only *.js or *.jsx files by default.

Example .vscode/settings.json:

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

Rules

The --fix option on the command line automatically fixes problems reported by rules which have a wrench :wrench: below.
The rules with the following star :star: are included in the config.

YAML Rules

Rule ID	Description	Fixable	RECOMMENDED
yml/block-mapping	require or disallow block style mappings.	:wrench:
yml/block-sequence	require or disallow block style sequences.	:wrench:
yml/indent	enforce consistent indentation	:wrench:
yml/key-name-casing	enforce naming convention to key names
yml/no-empty-key	disallow empty mapping keys		:star:
yml/no-empty-mapping-value	disallow empty mapping values		:star:
yml/no-empty-sequence-entry	disallow empty sequence entries		:star:
yml/no-tab-indent	disallow tabs for indentation.		:star:
yml/plain-scalar	require or disallow plain style scalar.	:wrench:
yml/quotes	enforce the consistent use of either double, or single quotes	:wrench:
yml/require-string-key	disallow mapping keys other than strings
yml/vue-custom-block/no-parsing-error	disallow parsing errors in Vue custom blocks		:star:

Extension Rules

Rule ID	Description	Fixable	RECOMMENDED
yml/flow-mapping-curly-newline	enforce consistent line breaks inside braces	:wrench:
yml/flow-mapping-curly-spacing	enforce consistent spacing inside braces	:wrench:
yml/flow-sequence-bracket-newline	enforce linebreaks after opening and before closing flow sequence brackets	:wrench:
yml/flow-sequence-bracket-spacing	enforce consistent spacing inside flow sequence brackets	:wrench:
yml/key-spacing	enforce consistent spacing between keys and values in mapping pairs	:wrench:
yml/no-irregular-whitespace	disallow irregular whitespace		:star:
yml/sort-keys	require mapping keys to be sorted	:wrench:
yml/spaced-comment	enforce consistent spacing after the # in a comment	:wrench:

Contributing

Welcome contributing!

Please use GitHub's Issues/PRs.

Development Tools

• npm test runs tests and measures coverage.
• npm run update runs in order to update readme and recommended configuration.

License

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