sp-dev-fx-webparts/samples/react-bot-framework-secure/bot/tsconfig.json

{
  "compilerOptions": {
    "declaration": true,
    "target": "es2016",
    "module": "commonjs",
    "outDir": "./lib",
    "rootDir": "./src",
    "sourceMap": true,
    "incremental": true,
    "tsBuildInfoFile": "./lib/.tsbuildinfo"
  }
}