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You can't cond-expand a module definition because you need the module definition in order to know what names are imported, including cond-expand. Rather than wrapping define-module in cond-expand, you need an inner cond-expand.  Unfortunately, Guile's define-module doesn't support a cond-expand form. Fortunately, R7RS's define-library does! So, you'd want to do something like this:

(define-library
  (cond-expand
    (hoot (import (web dom)))
    (else))
  (export message)
  ...)

Thanks a lot!