[qgis-qwc2] Building QWC2 on windows

[SL]

Hello,

I am trying to build QWC2 under Windows 10.
I am following the documentation ob Github:

git clone --recursive https://github.com/qgis/qwc2-demo-app.git
yarn install
yarn start

After "yarn install" I get some deprecation warnings for packages.
The process breaks during "yarn start" becaus of missing dependancies
("uuid").

I tried with a up-to-date NodeJS and with NodeJS 12.

I posted a detailed description at stackexchange:
https://gis.stackexchange.com/questions/390915/qwc2-build-pipeline-problems

Question: Is it possible to build it under Windows? Did anybody try to
do it?
What could be the problem with my approach?

Have a nice day,
Stefan Löhr