dart2wasm --debug flag not working

[Rexios80]

The following command runs code with assertions disabled, which means that it is not running in debug mode:

dart test -p chrome -c dart2wasm --debug

Unsure if this affects dart2wasm directly or the flag just isn't being passed

Related issues:
flutter/flutter#148850

[mkustermann]

The --debug flag does not seem to work for dart2wasm either. That is probably the root cause of this

The Dart2Wasm compiler is only used for --profile / --release builds (just like Dart2JS). For iterative development the DDC compiler (which also compiles to JS) is used (or the VM's JIT). In the short term dart2wasm will not have a development compiler (with hot-restart / hot-reload).

That being said, one can use Dart2Wasm for profile/release builds and still enable assertions - via dart compile wasm --enable-asserts test.dart.

dart test ... is using package:test under the hood which doesn't seem to have a way to enable assertions when running under wasm - see package:test_core/src/runner/wasm_compiler_pool.dart.

@Rexios80 Is your main request to run tests with assertions enabled? In that case consider filing an issue at https://github.com/dart-lang/test instead.

/cc @kevmoo

[Rexios80]

Yes you are correct. I will file an issue there instead. Thanks!