GWT compiler shows warning for class Platform.getDeclaringClassOrNullForJ2cl(Enum)

[lgemeinhardt]

The GWT compiler (latest version - 2.10.0) shows this warnings (using the latest version of guava)

Warnings in com/google/common/collect/super/com/google/common/collect/Platform.java
   [WARN] Line 107: [unusable-by-js] Return type of 'Class Platform.getDeclaringClassOrNullForJ2cl(Enum)' is not usable by but exposed to JavaScript.
[WARN] Suppress "[unusable-by-js]" warnings by adding a `@SuppressWarnings("unusable-by-js")` annotation to the corresponding member.

Is it possible to add the suggested @SuppressWarnings("unusable-by-js") to suppress it and avoid such warnings?

[cpovirk]

Thanks. I've found that I can reproduce this by adding <generateJsInteropExports>true</generateJsInteropExports> to our configuration.

I'm not absolutely 100% clear on what the warning is telling us, but I think I get the sense of it: It may be saying that we shouldn't expect for getDeclaringClassOrNullForJ2cl to be useful to call from JavaScript (as @JsMethod might suggest we intend to do), since Class doesn't map to a JavaScript type, but that's fine because we need only to implement it in JavaScript. (And that's all a result of how we set things up to work with both GWT and J2CL.)

@SuppressWarnings("unusable-by-js") does solve it. I'll get that committed.

[cpovirk]

The suppression landed in 32.1.0, but because we got the Gradle metadata wrong in that release, I suggest going straight to 32.1.1, which also contains the fix for that problem.