tsconfig.json

{
  "compileOnSave": false,
  "compilerOptions": {
    "sourceMap": true,
    "declaration": true,
    "module": "commonjs",
    "moduleResolution": "node",
    "esModuleInterop": true,
    "emitDecoratorMetadata": true,
    "experimentalDecorators": true,
    "target": "ES2016",
    "importHelpers": true
  }
}