Re: JsInterop @JsFunction is not really a function?

Hmm not 100% sure but it looks intended.

How the @JsFunction is implemented in the AST: 

https://gwt-review.googlesource.com/#/c/11960/8/dev/core/src/com/google/gwt/dev/jjs/impl/GenerateJavaScriptAST.java

How the Javascript function is generated that wraps the call to your @JsFunction Java SAM method: 

https://gwt-review.googlesource.com/#/c/11960/8/dev/core/super/com/google/gwt/dev/jjs/intrinsic/com/google/gwt/lang/JavaClassHierarchySetupUtil.java

So you can see the generated javascript function is calling the SAM method by providing itself as "this" (using samMethod.call(lambda, ..) ) and the proto is set to the Foo instance that has the samMethod defined.

-- J.

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