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I've migrated dozens of Mule projects over the years, so trust me when I say every DataWeave file needs an actual rewrite, not a find-and-replace. The header syntax changed , percent prefixes are gone except for %dw, fun uses =, and output/var/namespace lines are different, so those little header quirks will bite you first. The thing that breaks the most code is when/otherwise turning into if/else, because the condition and value swap places; that alone will make tests explode. Also, using(...) blocks become do { var ... --- body }, which is more verbose but way more flexible once you...