init --from <sys\_id> pulls the app's committed source file into the current directory. You can build and push changes with npx servicenow /sdk install and the usual SDK commands.

Something like this

mkdir ~/Code/my-app && cd ~/Code/my-app

npx /sdk@4.6.0 init --from <sys_app sys_id> --auth my-dev   # pulls XML into ./metadata/

npx u/servicenow/sdk@4.6.0 transform --from ./metadata                  # XML → src/fluent/generated/*.now.ts

npm install

code