tsconfig.json

{
  "compilerOptions": {
    "outDir": "./dist",
    "noImplicitAny": true,
    "module": "es6",
    "strict": true,
    "esModuleInterop": true,
    "moduleResolution": "node",
    "target": "es5",
    "importHelpers": true,
    "sourceMap": true
  },
  "include": ["src/**/*"],
  "exclude": ["node_modules", "**/*.spec.ts"]
}