Actually I believe it is a bug in closures externs from which elemental2 is generated. Without checking my guess is that IDBDatabase is annotated with a @constructor tag rather than a @interface which is incorrect as the spec defines it as an interface . Unfortunately, this is a common problem with some of the closure compiler externs. It does not impact people using closure compiler. Unfortunately, the jsinterop-generator will generate incorrect code if the extern is incorrectly annotated.
But they do accept fixes for these kind of things?
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