tsconfig.json

{
  "compilerOptions": {
    // Node’s next-gen ESM
    "module": "NodeNext",
    "moduleResolution": "NodeNext",

    // Output modern ES. Node 18 supports ES2020 or higher
    "target": "ES2020",

    // Strict type-checking
    "strict": true,
    "esModuleInterop": true,
    // Usually helps with external type definitions
    "skipLibCheck": true,
    // Force consistent file naming
    "forceConsistentCasingInFileNames": true,

    // Dist folder
    "outDir": "./dist",
    "rootDir": "./src",

    // Generate .d.ts for external use
    "declaration": true,
    "declarationMap": true
  },
  // We compile only "src" and skip node_modules + tests
  "include": ["src"],
  "exclude": ["node_modules", "**/__tests__"]
}