TypeScript Configuration Upgrades

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Overview

Comprehensive TypeScript configuration improvements with stricter rules, modern ES target, and enhanced type safety across the VS Code HTMLHint extension.

Changes Made

1. Main Extension (htmlhint/tsconfig.json)

• Target: Upgraded from ES6 to ES2022
• Libraries: Updated from ["es6", "dom"] to ["ES2022", "DOM"]
• Strict Mode: Enabled comprehensive strict typing:
  • strict: true
  • noImplicitAny: true
  • noImplicitReturns: true
  • strictNullChecks: true
  • strictFunctionTypes: true
  • strictBindCallApply: true
  • strictPropertyInitialization: true
• Additional Checks: Added unused code detection:
  • noUnusedLocals: true
  • noUnusedParameters: true
  • exactOptionalPropertyTypes: true
  • noUncheckedIndexedAccess: true
• Output: Added declaration files generation
• Performance: Added incremental compilation with build info caching

2. Server (htmlhint-server/src/tsconfig.json)

• Target: Upgraded from ES6 to ES2022
• Libraries: Updated to ["ES2022"]
• Strict Mode: Enabled but temporarily relaxed some rules for gradual migration:
  • strict: true but with strictNullChecks: false and noImplicitAny: false
• Output: Added declaration files generation
• Performance: Added incremental compilation

3. Tests (test/tsconfig.json)

• Target: Upgraded from ES6 to ES2022
• Libraries: Updated to ["ES2022", "DOM"]
• Strict Mode: Enabled with test-friendly relaxations:
  • strict: true but noUnusedLocals: false and noUnusedParameters: false
• Testing: Maintained mocha types support

Code Fixes

Extension (htmlhint/extension.ts)

Fixed null safety issue with configuration retrieval:

// Before
let languages: string[] = config.get("documentSelector");

// After  
let languages: string[] = config.get("documentSelector") || ["html", "htm"];

Server (htmlhint-server/src/server.ts)

• Settings null safety: Changed Settings to Settings | null
• Configuration access: Added optional chaining settings?.htmlhint
• Line access safety: Added null check for line array access
• Function typing: Added proper parameter types to loadConfigurationFile
• Error handling: Improved error type handling from any to unknown

Infrastructure Updates

Git Ignore (.gitignore)

Added TypeScript build info files: