sp-dev-fx-webparts/tutorials/tutorial-getting-started/helloworld-webpart/tsconfig.json

{
  "compilerOptions": {
    "target": "es5",
    "forceConsistentCasingInFileNames": true,
    "module": "commonjs",
    "jsx": "react",
    "declaration": true,
    "sourceMap": true,
    "types": [
      "es6-promise",
      "es6-collections",
      "webpack-env"
    ],
    "noUnusedLocals": true,
    "noUnusedParameters": true
  }
}