VegasFusion doesn't work

[rchiodo]

This prevents the python package the user has in the kernel from actually working correctly.

Recent example:
https://medium.com/@jonmmease/announcing-vegafusion-570f62207ba7

This doesn't work in our notebooks (likely because we ship our own version of vegas).

The python installed js file should work and if it needs something specific to jupyter, we could always polyfill it.

[DonJayamanne]

Looks like a different issue. I say this because the shipped copy isn't used at all, instead the scripts are downloaded from unpkg as they are ipywidgets.
I can see that the right files including the WASM files are all loaded from unpng (see below)
& from what I can tell unpkg has the latest version.

653, 654.js *.was are all downloaded as a result of this widget (vegafusion).

Other similar issues (loading scripts form nbextensions folder and this folder changes for jupyter lab):

• element variable not defined when rendering IPyWidgets #6054
• Turtle widgets support is just not workin ... and always giving error of "error loading nbextensions/mobilecheloninjs/turtlewidget"  #8241 (comment)
• VPython doesn't seem to work in vscode cell #1477 (comment)

[DonJayamanne]

Fixed

[rchiodo]

@DonJayamanne do you have verification steps for this?

[rchiodo]

Okay I think I attempted something that might be what this was trying to fix. It didn't work.

Here's the notebook I ran:

# %%
%pip install "vegafusion-jupyter[embed]" vega-datasets

# %%
import vegafusion as vf
vf.jupyter.enable()

# %%
import altair as alt
import pandas as pd

# %%
df = pd.read_json('./ipyvega/notebooks/cars.json')

alt.Chart(df).mark_point().encode(
    x='Horsepower',
    y='Miles_per_Gallon',
    color='Origin',
)

(works fine without the vf.jupyte.enable() cell because it just uses altair)

I get nothing in the output.

I have this in the developer tools (which sounds like the original error):

[DonJayamanne]

Notes:

This does not work with the latest version of vega-fusion 0.6.0, please test with and older version such as 0.4.0
Caused by an upstream issue vega/vegafusion#134 (i.e. latest version doesn't have the right files uploaded to the CDN).

Alternative, disable CDN and this will work