TypeScript Performance: Compilation Speed Optimization

// tsconfig.json
{
  "compilerOptions": {
    "composite": true,
    "declaration": true,
    "declarationMap": true
  },
  "references": [
    { "path": "../core" },
    { "path": "../utils" }
  ]
}

{
  "compilerOptions": {
    "incremental": true,
    "tsBuildInfoFile": ".tsbuildinfo"
  }
}

# Use watch mode for faster development
tsc --watch

# With project references
tsc --build --watch

// Type-only import - not emitted in JS
import type { User } from './types';
import { userService } from './services';

// Type-only export
export type { User };

{
  "compilerOptions": {
    "skipLibCheck": true
  }
}