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I tried every solution in this post:

Javascript Error: IPython is not defined in JupyterLab

yet, receive the same error in jupyterLab 3.3.2 (but it properly worked in VScode). Any would be appreciated.

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Had same issue, I have uninstalled juypter and notebooks:

    pip install pip-autoremove
    pip-autoremove jupyter -y

    python -m pip uninstall -y jupyter jupyter_core jupyter-client jupyter-console jupyterlab_pygments notebook qtconsole nbconvert nbformat jupyterlab-widgets nbclient jupyter-server-mathjax jupyterlab-code-formatter jupyterlab-lsp nbclassic nbdime jupyterlab-git

and then installed again

    pip install notebook
    pip install jupyter

Magically it worked and the ipywidgets work in the notebook now

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