tsconfig.server.json

{
  "include": ["src/server"], // compile TS files in server directory
  "compilerOptions": {
    "module": "commonjs", // classic format that Node.js understands
    "esModuleInterop": true, // allow imports of modules in ES format
    "skipLibCheck": true, // only check types we refer to from our code
    "forceConsistentCasingInFileNames": true, // prevents cross-OS problems
    "resolveJsonModule": true, // enable import of JSON files
    "lib": ["es6", "dom"], // use JavaScript API ES6
    "target": "es6", // compile to ES6
    "jsx": "react", // compile JSX to React.createElement statements for SSR
    "allowJs": true, // allow import of JS modules
    // enable strict type checking
    "strict": true,
    "strictNullChecks": true,
    "noImplicitAny": true
  }
}