tsconfig.json

{
  "compilerOptions": {
    "target": "es6",
    "module": "commonjs",
    "moduleResolution": "node",
    "esModuleInterop": true,
    "outDir": "build",
    "lib": ["esnext", "dom"],
    "strict": true,
    "sourceMap": true,
    "declaration": true,
    "emitDecoratorMetadata": true,
    "experimentalDecorators": true
  },
  "include": ["lib"],
  "exclude": ["node_modules"]
}