tsconfig.json

{
  "compilerOptions": {
    "target": "ES2022",
    // `nodenext` matches Node ESM rules, so relative imports must carry the
    // `.js` extension (as our sources do) and an extensionless import fails
    "module": "nodenext",
    "moduleResolution": "nodenext",
    "lib": ["ES2022", "DOM", "DOM.Iterable"],
    "strict": true,
    "noEmit": true,
    // Rolldown and Vite both compile each file in isolation (type stripping
    // only), so the syntax must be erasable and imports/exports of types must be
    // explicit. `verbatimModuleSyntax` already implies `isolatedModules`.
    "verbatimModuleSyntax": true,
    "erasableSyntaxOnly": true,
    "useDefineForClassFields": true,
    "forceConsistentCasingInFileNames": true,
    "skipLibCheck": true
  },
  "include": ["js/src/**/*.ts", "js/tests/types/**/*.ts"],
  // `consumer.ts` checks the shipped `js/dist/*.d.ts`, which only exist after
  // the build. It has its own config (`tsconfig.consumer.json`) and runs then.
  "exclude": ["js/tests/types/consumer.ts"]
}