or run

npx @tessl/cli init

Version

Tile

Overview

Evals

Files

docs

base-configuration.md hooks-configuration.md index.md legacy-configuration.md main-configuration.md rule-modules.md whitespace-configuration.md

tile.json

Legacy Configuration

Legacy ES5 ESLint configuration without modern ES6+ features. Note: This configuration is deprecated. Use eslint-config-airbnb-base/legacy instead.

Capabilities

Legacy Configuration (Deprecated)

Provides Airbnb's ESLint rules for legacy ES5 JavaScript environments by extending eslint-config-airbnb-base/legacy.

/**
 * Legacy Airbnb ESLint configuration (DEPRECATED)
 * Usage: extends: ['airbnb/legacy']
 * Recommended: Use 'eslint-config-airbnb-base/legacy' directly instead
 */
const legacyConfig = {
  extends: ['eslint-config-airbnb-base/legacy'],
  rules: {}
};

Usage Examples:

// .eslintrc.js - Deprecated usage
module.exports = {
  extends: ['airbnb/legacy'] // Don't use this
};

// .eslintrc.js - Recommended alternative
module.exports = {
  extends: ['airbnb-base/legacy'] // Use this instead
};

Migration to eslint-config-airbnb-base/legacy

The legacy configuration is a simple wrapper around eslint-config-airbnb-base/legacy. Users should migrate to using the base package directly:

interface MigrationPath {
  // Old (deprecated)
  oldConfig: {
    extends: ['airbnb/legacy'];
  };
  
  // New (recommended)
  newConfig: {
    extends: ['airbnb-base/legacy'];
  };
}

Migration Steps:

Install eslint-config-airbnb-base directly:

npm install --save-dev eslint-config-airbnb-base

Update ESLint configuration:

// Before
module.exports = {
  extends: ['airbnb/legacy']
};

// After
module.exports = {
  extends: ['airbnb-base/legacy']
};

Remove eslint-config-airbnb if not using React rules:
```
npm uninstall eslint-config-airbnb
```

Included Rules

The legacy configuration includes all rules from eslint-config-airbnb-base/legacy:

interface LegacyRules {
  // ES5 JavaScript features only
  es5Rules: boolean;
  
  // Legacy variable declaration patterns
  varDeclaration: boolean;
  
  // Function expressions and declarations
  functionRules: boolean;
  
  // Object and array handling (ES5)
  objectArrayRules: boolean;
  
  // Control flow and conditionals
  controlFlowRules: boolean;
  
  // Error handling and debugging
  errorHandlingRules: boolean;
}

Configuration Structure

interface LegacyConfiguration {
  extends: ['eslint-config-airbnb-base/legacy'];
  rules: Record<string, never>; // Empty rules object
}

Use Cases

The legacy configuration was originally intended for:

interface LegacyUseCases {
  // ES5-only environments
  es5Environments: boolean;
  
  // Internet Explorer compatibility
  ieCompatibility: boolean;
  
  // Legacy Node.js versions
  oldNodeJS: boolean;
  
  // Embedded JavaScript environments
  embeddedJS: boolean;
  
  // Build tools and scripts requiring ES5
  buildScripts: boolean;
}

However, all these use cases are better served by using eslint-config-airbnb-base/legacy directly.

ES5 vs ES6+ Differences

The legacy configuration differs from the main configuration by excluding:

interface ExcludedFeatures {
  // Modern ES6+ features not available in legacy config
  arrowFunctions: false;
  classes: false;
  destructuring: false;
  templateLiterals: false;
  letConst: false;
  modules: false;
  defaultParameters: false;
  restSpread: false;
  
  // Features available in legacy config
  varDeclarations: true;
  functionExpressions: true;
  objectLiterals: true;
  arrayMethods: true;
  regularExpressions: true;
}