Where is MathJax object?

[jmshea]

Description

I need to access the MathJax object (window.MathJax) so I can call the typeset method on some dynamic content from JavaScript. But I don't see MathJax or window.MathJax after installing this extension.

Reproduce

1. pip install jupyterlab-mathjax3
2. (in Javascript, check which version of MathJax we have): if (typeof MathJax != 'undefined') -> falls through to else

Expected behavior

window.MathJax is where MathJax usually lives, as far as I know.

Context

• Operating System and version: Darwin Kernel Version 21.6.0: Wed Aug 10 14:25:27 PDT 2022; root:xnu-8020.141.5~2/RELEASE_X86_64
• Browser and version: Safari Version 15.6.1 (17613.3.9.1.16)
• JupyterLab version:
  Selected Jupyter core packages...
  IPython : 8.4.0
  ipykernel : 6.9.1
  ipywidgets : 7.6.5
  jupyter_client : 6.1.12
  jupyter_core : 4.10.0
  jupyter_server : 1.18.1
  jupyterlab : 3.4.4
  nbclient : 0.5.13
  nbconvert : 6.4.4
  nbformat : 5.3.0
  notebook : 6.4.12
  qtconsole : 5.3.1
  traitlets : 5.1.1
  jupyterlab-mathjax3 4.3.0

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