tsconfig.json

{
  "compilerOptions": {
    "target": "ES2020",
    "module": "commonjs",
    "lib": ["ES2020"],
    "outDir": "./dist",
    "rootDir": "./src",
    "strict": true,
    "esModuleInterop": true,
    "skipLibCheck": true,
    "forceConsistentCasingInFileNames": true,
    "declaration": true,
    // No `declarationMap`/`sourceMap`. `files` publishes `dist` only, so every emitted
    // map referenced a `../src/*.ts` that is not in the tarball: go-to-definition fell
    // back to the `.d.ts` anyway, and 638 unusable map files were ~2 MB of install size
    // for nothing. Publishing `src` is the other way to fix it, and is a packaging policy
    // decision rather than a defect fix.
    "moduleResolution": "node",
    "allowSyntheticDefaultImports": true,
    "resolveJsonModule": true
  },
  "include": ["src/**/*"],
  "exclude": ["node_modules", "dist", "**/*.test.ts", "**/*.spec.ts"]
}