I did it by hand. It's a mostly mechanical transformation, so in theory it could be automated, but I've never seen an automated refactor for any language that c

I did it by hand. It's a mostly mechanical transformation, so in theory it could be automated, but I've never seen an automated refactor for any language that can e.g. take a giant file and decide how to split it up into 5 smaller files. But that's something I'd love to see exist