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Can the js code be deployed in the same .xlsx file as the spreadsheet?

Still, I’m disappointed MS didn’t implement a typesafe lang such as C# or F#.

Office JS is about writing addins, rather than macros. You have been able to do the same in C# /F# for years using VSTO or Excel-DNA

They did using m. It's been there in powerquery for maybe 10 years now.