#atom

Extension modules that add custom rules and configurations to ESLint

Core Idea: ESLint plugins are packages that extend ESLint's core functionality with additional rules, configurations, processors, and environments tailored to specific frameworks, libraries, or coding patterns.

Key Elements

• Key Functions:

  • Add specialized linting rules beyond ESLint core
  • Provide framework-specific code analysis
  • Enable linting for non-JavaScript files
  • Add shareable configurations for specific technologies
  • Create custom environments with global variables

• Plugin Components:

  • Rules: Custom linting rules specific to the plugin's focus
  • Configs: Shareable configurations that can be extended
  • Processors: Tools to extract JavaScript from other file types
  • Environments: Predefined global variables for specific contexts
  • Utils: Helper functions for rule implementations

• Popular Plugins:

  • eslint-plugin-react: React-specific rules and best practices
  • eslint-plugin-jsx-a11y: Accessibility checks for JSX
  • @typescript-eslint/eslint-plugin: TypeScript-specific rules
  • eslint-plugin-import: Rules for proper import/export syntax
  • eslint-plugin-prettier: Prettier integration
  • eslint-plugin-vue: Vue.js-specific rules
  • eslint-plugin-jest: Testing-specific rules for Jest

• Implementation Example:

  // In .eslintrc.js
  module.exports = {
    plugins: [
      'react',
      'jsx-a11y',
      '@typescript-eslint',
      'import'
    ],
    extends: [
      'plugin:react/recommended',
      'plugin:jsx-a11y/recommended',
      'plugin:@typescript-eslint/recommended',
      'plugin:import/errors',
      'plugin:import/typescript'
    ],
    rules: {
      // Override specific plugin rules
      'react/jsx-filename-extension': ['error', { extensions: ['.tsx'] }],
      'import/order': ['error', { 
        groups: ['builtin', 'external', 'internal'],
        'newlines-between': 'always'
      }]
    }
  };
  

- **Creating Custom Plugins**:
    - Plugins follow a naming convention: `eslint-plugin-{name}`
    - Can be published to npm or used locally
    - Must export an object with rules and/or configurations
    - Can implement custom AST traversal logic
    - Should include documentation and tests

## Connections

- **Related Concepts**: ESLint (the base tool), ESLint Rules (components of plugins), ESLint Configurations (often provided by plugins)
- **Broader Context**: Static Code Analysis (ecosystem of code analysis tools)
- **Applications**: Framework-Specific Linting (specialized rules for frameworks)
- **Components**: Abstract Syntax Tree (AST) (foundation for rule implementation)

## References

1. ESLint Plugins Documentation: https://eslint.org/docs/latest/extend/plugins
2. "Creating Custom ESLint Plugins" by Nicholas C. Zakas
3. "ESLint Plugin Development Guide" by ESLint Team

#eslint #javascript #typescript #plugins #code-quality #static-analysis

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**Connections:**
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**Sources:**
- From: Syntax - Lint como un desarrollador senior con eslint + husky + lint staged + acciones de github