I need to make some javascript changes to jupyterlab source code. I am modifying notebook-extension and couple other javascript packages. I am able to see the code changes while running jupyterlab with dev-mode but these changes are not reflected when running without dev-mode. How can I build jupyterlab with my code changes so I can use it in production?

I am using following commands to build as mentioned in the docs.

git clone https://github.com/jupyterlab/jupyterlab.git
cd jupyterlab
pip install -e .
jlpm
jlpm run build:packages