Error when trying to subclass Bokeh.models.Div

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yes, i should have put the pieces together. here is a minimum reproducible example:

i have a file called test.py which looks like:

from bokeh.models import Div
from bokeh.util.compiler import JavaScript


class TestDiv(Div):
    def __init__(self):
        super(Div, self).__init__(text="")
        __implementation__ = JavaScript("")

then, in a jupyter notebook, i have this:

from bokeh.io import output_notebook
from bokeh.plotting import show
from test import TestDiv

output_notebook(hide_banner=True)

print(TestDiv())

show(TestDiv())

i get this output:

TestDiv(id='1012', ...) 

Javascript Error: Model 'test.TestDiv' does not exist. This could be due to a widget or a custom model not being registered before first usage.

i realize this is differnet from the error i had initially, but i still can’t figure out why i get this. i found this thread but couldn’t find anything that helps

I’m using Bokeh v2.4.3, on macOS. this error is on multiple browsers (Safari, Chrome, FF)

i don’t see any errors in the JS console