RRManager is a Redpill Recovery DSM application aimed to provide the ability to configure/update RR without booting to RR recovery. This package is for experienced users.
It's not correct. rr-manager and rr-manager.widget is too separate files. Before start packing the solution, you need install nodejs, then run npm install, npm run build and then build the spk package.
src/ui/rr-manager.widget.js should changes to src/ui/rr-manager.js The command I used was 'make arch-x64-7.2' , wsl2 told me a js file is missing.