Convert DefaultExternalServices.fallback
to an asynchronous method
#12800
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This method currently accepts a callback-function, which does feel a bit old fashioned now. At the time that this code was introduced, native Promises didn't exist yet and there's a custom Promise-implementation used instead.
However, today with Promises and async/await being used a lot it seems reasonable to change
DefaultExternalServices.fallback
to anasync
method instead such that the callback-function can be removed.