tsconfig.json

{
  "compilerOptions": {
    "target": "es6",
    "module": "commonjs",
    "pretty": true,
    "sourceMap": true,
    "outDir": "dist",
    "importHelpers": true,
    "strict": true,
    "noImplicitAny": false,
    "strictNullChecks": false,
    "noImplicitThis": true,
    "alwaysStrict": true,
    "noUnusedLocals": true,
    "noUnusedParameters": false,
    "noImplicitReturns": true,
    "noFallthroughCasesInSwitch": true,
    "moduleResolution": "node",
    "baseUrl": ".",
    "allowSyntheticDefaultImports": true,
    "experimentalDecorators": true,
    "emitDecoratorMetadata": true,
    "resolveJsonModule": true,
    "esModuleInterop": true,
    "lib": [
      "es5",
      "es6",
      "dom",
      "es2015.core",
      "es2015.collection",
      "es2015.generator",
      "es2015.iterable",
      "es2015.promise",
      "es2015.proxy",
      "es2015.reflect",
      "es2015.symbol",
      "es2015.symbol.wellknown",
      "esnext.asynciterable"
    ]
  }
}