[kevmoo]

On both JS and dart2wasm, JSAny?.dartify() allocates <Object?, Object?>{} for JS objects, so direct as Map<String, T> casts throw TypeError at runtime. This PR fixes and adds browser unit tests for Trace.getAttributes() in firebase_performance_web, RemoteConfig.defaultConfig in firebase_remote_config_web, and User.toJson() in firebase_auth_web.

Verified locally under flutter test --platform=chrome and flutter test --platform=chrome --wasm.

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[kevmoo]

/gemini review

[gemini-code-assist]

Code Review

This pull request removes the toJson method from the web User class, removes the defaultConfig getter from RemoteConfig, and refactors Trace.getAttributes to handle null or empty attributes more safely, accompanied by new unit tests. Regarding the feedback, using as Map? on the result of dartify() in Trace.getAttributes could still lead to a runtime TypeError if the returned value is not a map; it is recommended to use flow analysis with is Map instead to ensure type safety.