tsconfig.json

{
  // see https://www.typescriptlang.org/tsconfig to better understand tsconfigs
  "include": ["src", "test"],
  "exclude": ["es", "dist", "node_modules"],
  "compilerOptions": {
    "module": "ES2022",
    "target": "esnext",
    "lib": ["esnext"],
    // could not be '' or '.' due to Jest
    "outDir": "./lib",
    "allowJs": true,
    "importHelpers": true,
    // output .d.ts declaration files for consumers
    "declaration": true,
    "declarationMap": true,
    // output .js.map sourcemap files for consumers
    "sourceMap": true,
    // match output dir to input dir. e.g. dist/index instead of dist/src/index
    //"rootDir": "./src",
    // stricter type-checking for stronger correctness. Recommended by TS
    "strict": true,
    "alwaysStrict": true,
    //"strictPropertyInitialization": true,
    //"noUnusedLocals": true,
    //"noUnusedParameters": true,
    // linter checks for common issues
    "noImplicitReturns": true,
    "noFallthroughCasesInSwitch": true,
    "types": ["node", "jest"],
    // noUnused* overlap with @typescript-eslint/no-unused-vars, can disable if duplicative
    "noUnusedLocals": false,
    "noUnusedParameters": false,
    // use Node's module resolution algorithm, instead of the legacy TS one
    "moduleResolution": "Bundler",
    "resolveJsonModule": true,
    // interop between ESM and CJS modules. Recommended by TS
    "esModuleInterop": true,
    "isolatedModules": true,
    // significant perf increase by skipping checking .d.ts files, particularly those in node_modules. Recommended by TS
    "skipLibCheck": true,
    // error out if import and file system have a casing mismatch. Recommended by TS
    "forceConsistentCasingInFileNames": true,
    "noEmit": true,
    //additional
    "experimentalDecorators": true,
    "strictNullChecks": true,
    "strictFunctionTypes": true,
    "noImplicitAny": true,
    "noImplicitThis": true,
    "stripInternal": true,
    "downlevelIteration": true,
    "useDefineForClassFields": true
  }
}