tsconfig.node.json

{
  "compilerOptions": {
    "composite": true,
    "skipLibCheck": true,
    "module": "ESNext",
    "moduleResolution": "bundler",
    "allowSyntheticDefaultImports": true,
    // Vite's `configLoader: 'native'` (a future default) loads these configs
    // through Node's own TS support, and Node's ESM resolver requires a real
    // file extension — so `./scripts/manualChunks.ts` is written with one.
    // Writing `.ts` in a specifier needs this flag, which in turn requires a
    // non-emitting project.
    "allowImportingTsExtensions": true,
    "emitDeclarationOnly": true,
    "declarationDir": "./node_modules/.tmp/tsconfig-node",
    "tsBuildInfoFile": "./node_modules/.tmp/tsconfig-node/.tsbuildinfo",
    "types": ["node"]
  },
  // A composite project must list every file it pulls in, and this one listed
  // only `vite.config.ts` — so `manualChunks.ts` and `vitest.shared.ts` were
  // outside it, and the four vitest configs were type-checked by nothing at all.
  // That was invisible because `tsc --noEmit` does not build project references;
  // `pnpm typecheck` now runs this project explicitly as a second step.
  "include": [
    "vite.config.ts",
    "vitest.config.ts",
    "vitest.browser.config.ts",
    "vitest.gates.config.ts",
    "vitest.soak.config.ts",
    "vitest.shared.ts",
    "scripts/manualChunks.ts"
  ]
}