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The change https://dart-review.googlesource.com/c/sdk/+/323000 added a dependency on dart2wasm to the frontend_server package. Flutter engine has all dependencies in its source checkout, and paths to their locations hardcoded in the dependency_ovedrrides of flutter_frontend_server's pubspec.yaml. Add the dart2wasm package location to pubspec.yaml. Add the transitive dependency wasm_builder package lcoation to pubspec.yaml.