# How to build a whl jupyterlab file?

**URL:** <https://discourse.jupyter.org/t/how-to-build-a-whl-jupyterlab-file/27158>\
**Category:** JupyterLab\
**Tags:** help-wanted\
**Created:** [July 24, 2024, 8:38am UTC](https://discourse.jupyter.org/t/how-to-build-a-whl-jupyterlab-file/27158 "2024-07-24T08:38:30Z")\
**Posts on this page:** 1\
**Page:** 1

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**Author:** ![nepster](https://avatars.discourse-cdn.com/v4/letter/n/e5b9ba/32.png) [@nepster](https://discourse.jupyter.org/u/nepster)\
**Post date:** [July 24, 2024, 8:38am UTC](https://discourse.jupyter.org/t/how-to-build-a-whl-jupyterlab-file/27158/1 "2024-07-24T08:38:30Z")

</div>

I am learning how to develop jupyterlab. And I modifed something on launcher.  
when I use jupyter lab --dev-mode。The modification is work.  
But,when I use python -m build to build a whl file.And I installed the whl file on another computer. The modification is gone.  
I don’t know why? Anyone could help me ?