tsconfig.json

{
  "compilerOptions": {
    "allowJs": true,
    "target": "ES2018",
    "module": "CommonJS",
    "lib": ["dom", "es2017"],
    "moduleResolution": "node",
    "sourceMap": true,
    "downlevelIteration": true,
    "strict": true,
    "noImplicitAny": true, // should always assign value to params (recheck it)
    "strictFunctionTypes": true,
    "alwaysStrict": true,
    "skipLibCheck": true,
    "noUnusedLocals": true, // change later
    "noUnusedParameters": false, // params should be used
    "noImplicitReturns": true,
    "noFallthroughCasesInSwitch": true,
    "esModuleInterop": true,
    "forceConsistentCasingInFileNames": true,
    "strictPropertyInitialization": false, // optional,
    // "baseUrl": "./server", // import from common/.. i,e base utl is server
    "emitDecoratorMetadata": true,
    "experimentalDecorators": true,
    "typeRoots": ["server/common/types", "./node_modules/@types"]
  },
  "include": ["server/**/*.ts"],
  "exclude": ["node_modules", "client", "./utils"]
}