nfrontend/tsconfig.json

{
    "compilerOptions": {
      "moduleResolution": "node",
      "target":"es2017",
      "lib": ["es2015","es2015.promise"],
      "noImplicitAny": true,
      "preserveConstEnums": true,
      "outDir": "out",
      "sourceMap": true
    },
    "include": ["src/**/*"],
    "exclude": ["node_modules", "**/*.spec.ts"]
    }