It would be advantageous to be able to chain a NativePromise to a DOMPromise such that when the NativePromise is resolved it will automatically resolve the DOMPromise. One advantage other than the simplification of common use-case would be that you wouldn't need to pass the DOMPromise around like we often do, and remove the need to always include DOMPromise.h . which pull JavaScriptCore/JSPromise.h and takes forever to build.
<rdar://problem/116549749>