There isn't any source code generated. They will open source the runtime so you can host your own apps if you want to. Auto-generated code is pretty useless to be picked up by developer and worked on, it's used purely as a way to get the code out to be hosted elsewhere, if you can host the runtime yourself, as you will, then you don't need the code. For example WeWeb have code export and they explicitly say it's for self-hosting and is not human-readable to be worked on after export.
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