tsconfig.json

{
  // Typechecks the test suites (`pnpm typecheck:tests`). The vitest runs
  // compile through esbuild, which strips types without checking them, so
  // without this a type error in a test file is invisible. Also the config
  // eslint's type-aware rules run against (see eslint.config.js).
  "extends": "../tsconfig.base.json",
  "compilerOptions": {
    "target": "ES2022",
    "module": "node16",
    "moduleResolution": "node16",
    "allowSyntheticDefaultImports": true,
    "esModuleInterop": true,
    "allowJs": true,
    "checkJs": false,
    "declaration": false,
    "declarationMap": false,
    "sourceMap": true,
    "removeComments": false,
    "strict": true,
    "strictNullChecks": true,
    "strictFunctionTypes": true,
    "noImplicitReturns": true,
    "noFallthroughCasesInSwitch": true,
    "noUncheckedIndexedAccess": false,
    "lib": ["ES2022", "DOM"],
    "types": ["node", "vitest/globals"],
    "skipLibCheck": true,
    "forceConsistentCasingInFileNames": true,
    "resolveJsonModule": true,
    "isolatedModules": true,
    // Matches the root build config; the base config's `true` would require
    // tslib, which is not a dependency.
    "importHelpers": false,
    "noEmit": true,
    "rootDir": "../",
    "paths": {
      "@/*": ["../src/*"]
    },
    // `../node_modules` is required for the `vitest/globals` entry above to
    // resolve: it lives at node_modules/vitest/globals.d.ts, not under
    // @types. Without it tsc fails with TS2688 and checks nothing at all.
    "typeRoots": ["../types", "../node_modules/@types", "../node_modules"]
  },
  "include": ["**/*.ts", "**/*.js"],
  "exclude": ["out"]
}