tsconfig.test.json

{
  "extends": "./tsconfig.settings",
  "include": ["./src", "./test", "./vitest.config.ts", "./vitest.*.config.ts"],

  // `type-compatible.ts` is checked by `tsconfig.types.json` instead, via `npm run test:types`.
  // It imports the built `dist` output, so it can only be checked after a build - which is not
  // something `npm run lint` should require.
  "exclude": ["./test/type-compatible.ts"],
  "compilerOptions": {
    "noEmit": true,

    // The tests run in browsers as well as on the server, so they use DOM globals
    // (`location`, `DOMException`, `MessageEvent`) that the library build must not rely on.
    "lib": ["ES2023", "DOM"]
  }
}