sp-dev-fx-webparts/samples/react-multipage/config/config.json

{
  "entries": [
    {
      "entry": "./lib/webparts/poll/PollWebPart.js",
      "manifest": "./src/webparts/poll/PollWebPart.manifest.json",
      "outputPath": "./dist/poll.bundle.js"
    }
  ],
  "externals": {},
  "localizedResources": {
    "pollStrings": "webparts/poll/loc/{locale}.js"
  }
}