Custom Widget built from cookie cutter not working in Jupyter Lab 3.0

[cornhundred]

Hi, I am having trouble getting a Jupyter Widget that was built by @thomasballinger using this template working in Jupyter Lab 3.0 (it works in Jupyter notebook)

I raised the issue here and I'll summarize below:

I'm seeing the following error when I try to open the widget in JupyterLab

523.92b431af199caa12622d.js:1 Error: Module observable-jupyter-widget, semver range ^0.1.8 is not registered as a widget module
at x.loadClass (523.92b431af199caa12622d.js:1:5727)
at x. (272.eb0d340d1eec40ac564f.js:1:9479)
at 272.eb0d340d1eec40ac564f.js:1:6081
at Object.next (272.eb0d340d1eec40ac564f.js:1:6186)
at 272.eb0d340d1eec40ac564f.js:1:5122
at new Promise ()
at D (272.eb0d340d1eec40ac564f.js:1:4867)
at x.e._make_model (272.eb0d340d1eec40ac564f.js:1:9358)
at x. (272.eb0d340d1eec40ac564f.js:1:9212)
at 272.eb0d340d1eec40ac564f.js:1:6081
I'm thinking it might be related to this issue:
#39

Here's a link to a Code Ocean capsule that reproduces the issue - works in Jupyter Notebook and does not run in Jupyter Lab - this capsule does a good job of capturing the compute environment.