tsconfig.json

{
  "compilerOptions": {
    "target": "ES2020",
    "module": "ESNext",
    "moduleResolution": "bundler",
    "strict": true,
    "noUnusedLocals": true,
    "noUnusedParameters": false,
    "esModuleInterop": true,
    "skipLibCheck": true,
    "resolveJsonModule": true,
    "forceConsistentCasingInFileNames": true,
    "lib": ["ES2020", "DOM", "DOM.Iterable"],
    "types": ["vitest/globals", "vite/client", "node"],
    "noEmit": true,
    "baseUrl": ".",
    "paths": {
      "@shared/*": ["src/shared/*"],
      "@host/*": ["src/host/*"]
    }
  },
  // NOTHING is excluded, deliberately. arcade-shared shipped with no tsconfig of its
  // own, so its 26 test files were never compiled — only run through vitest, which
  // strips types without checking them. Folding the library into `src` during the
  // 2026-07-30 collapse newly typechecked them and surfaced 22 pre-existing errors,
  // every one in src/shared/tests/synth.test.ts, whose Web Audio doubles did not
  // satisfy the types they stood in for. The migration held the line with a
  // one-file `exclude`; mg1-9 fixed the doubles and removed it.
  //
  // If a type error ever makes an `exclude` look attractive again: it buys a green
  // check by shrinking what is checked, and the file it hides stays hidden long after
  // whoever added it has moved on — the errors above went unnoticed for the entire
  // life of arcade-shared. `tests/shared-tests-typechecked.test.mjs` asserts this key
  // stays empty and that every TEST file under src/shared/tests is in the tsc program.
  // (The two helpers/*.ts files are compiled too, but the assertion enumerates *.test.ts.)
  "include": ["src", "plugins", "lobby", "scripts"]
}