Installation using poetry: frontend is not installed

Description

After installing there is no “Git” icon in the left side panel.

Reproduce

With python version 3.6 (managed using pyenv), node 13.1.0, npm 6.12.1:

1. poetry init -n
2. poetry add jupyter jupyterlab jupyterlab-git
3. poetry shell
4. jupyter lab build
5. jupyter lab
6. Visit the browser.

Expected behavior

I expect to see the Git icon in the left panel

Context

output of jupyter lab build:

$ jupyter lab build
[LabBuildApp] JupyterLab 1.2.3
[LabBuildApp] Building in /Users/<user>/Library/Caches/pypoetry/virtualenvs/<virtualenv_name>/share/jupyter/lab
[LabBuildApp] Building jupyterlab assets (build:prod:minimize)

output of jupyter lab:

$ jupyter lab
[I 14:23:08.833 LabApp] JupyterLab extension loaded from /Users/<user>/Library/Caches/pypoetry/virtualenvs/<virtualenv_name>/lib/python3.6/site-packages/jupyterlab
[I 14:23:08.833 LabApp] JupyterLab application directory is /Users/<user>/Library/Caches/pypoetry/virtualenvs/<virtualenv_name>/share/jupyter/lab
[I 14:23:09.191 LabApp] Serving notebooks from local directory: <cwd>
[I 14:23:09.191 LabApp] The Jupyter Notebook is running at:
[I 14:23:09.191 LabApp] http://localhost:8888/?token=<blahblah>
[I 14:23:09.191 LabApp]  or http://127.0.0.1:8888/?token=<blahblah>
[I 14:23:09.191 LabApp] Use Control-C to stop this server and shut down all kernels (twice to skip confirmation).
[C 14:23:09.195 LabApp]

    To access the notebook, open this file in a browser:
        file:///Users/<user>/Library/Jupyter/runtime/nbserver-2059-open.html
    Or copy and paste one of these URLs:
        http://localhost:8888/?token=<blahblah>
     or http://127.0.0.1:8888/?token=<blahblah>
[I 14:23:11.705 LabApp] Build is up to date

poetry.lock: poetry.lock.txt

jupyter serverextension list:

$ jupyter serverextension list
config dir: /Users/<user>/.jupyter
    jupyterlab_git  enabled
    - Validating...
      jupyterlab_git  OK
config dir: /Users/<user>/Library/Caches/pypoetry/virtualenvs/<virtualenv_name>/etc/jupyter
    jupyterlab  enabled
    - Validating...
      jupyterlab 1.2.3 OK
    nbdime  enabled
    - Validating...
      nbdime 1.1.0 OK

jupyter labextension list:

$ jupyter labextension list
JupyterLab v1.2.3
Known labextensions:
   app dir: /Users/<user>Library/Caches/pypoetry/virtualenvs/<virtualenv_name>/share/jupyter/lab
        nbdime-jupyterlab v1.0.0  enabled  OK

browser is Firefox 70.0.1 on Mac 10.15.

browser console:

Starting application in workspace: "/lab/workspaces/auto-v" index.js:34:4
>>>

[fcollonval]

Thx Harry for investigating more. A new version of the package will soon be available with the lab extension shipped within it. Maybe this will at least solve the “classical” installation (i.e. not via github).

[harrybiddle]

To investigate your theory I did an experiment:

1. Install the poetry environment as above, except without the jupyterlab-git line
2. Add the jupyterlab-git line to pyproject.toml. Run poetry lock && poetry install.
3. jupyter lab build

However, the frontend element still did not appear. I tried to put Poetry into verbose mode but I still can’t find any logs. If I get a chance I’ll try another investigation.