Technically, you can't use Webpack Module Federation with a Flutter web build, as Flutter doesn't generate Webpack modules; it just gives static files like index.html, main.dart.js, and assets. This means Webpack cannot consume it like a regular remote module. The easiest and most dependable integration of Flutter as a micro front in Angular would be building the Flutter web app on its own and rendering it through an iframe inside an Angular routed component. You can still make use of postMessage for two-way communication between the Angular side and the Flutter side; this works well for most use cases. The separation is quite clean, and, honestly, to force Webpack federation with Flutter is just signing up for some headaches.