tsconfig.json

{
  "compilerOptions": {
    "module": "esnext",
    "target": "ES6",
    "lib": [
      "DOM",
      "esnext",
      "ES6",
      "DOM.Iterable",
      "ScriptHost",
      "ES2016.Array.Include"
    ],
    "declaration": 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
    // stricter type-checking for stronger correctness. Recommended by TS
    "strict": true,
    "strictNullChecks": false,
    // linter checks for common issues
    "noImplicitReturns": false,
    "noFallthroughCasesInSwitch": true,
    "noImplicitAny": false,
    // noUnused* overlap with @typescript-eslint/no-unused-vars, can disable if duplicative
    "noUnusedParameters": true,
    // use Node's module resolution algorithm, instead of the legacy TS one
    "moduleResolution": "node",
    // transpile JSX to React.createElement
    "jsx": "react-jsx",
    // interop between ESM and CJS modules. Recommended by TS
    "esModuleInterop": 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,
    "alwaysStrict": false,
    "noEmit": true
  },
  "exclude": [
    "**/__tests__/*",
    "node_modules",
    "dist",
    "**/dist/**",
    "packages/*/dist/**"
  ]
}