Vega 5.26.1 breaks JupyterChart

[manzt]

First posted in anywidget:

• Altair demo from medium article broken manzt/anywidget#381

It seems there is a bug in latest patch release of Vega (vega/vega#3829), that breaks the altair "hello, world":

import altair as alt
from vega_datasets import data

source = data.cars()
brush = alt.selection_interval()

points = alt.Chart(source).mark_point().encode(
    x="Horsepower",
    y="Miles_per_Gallon",
    color=alt.condition(brush, "Origin", alt.value("lightgray"))
).add_params(
    brush
)

bars = alt.Chart(source).mark_bar().encode(
    y="Origin",
    color="Origin",
    x="count(Origin)"
).transform_filter(
    brush
)

alt.jupyter.JupyterChart(points & bars)

This occurs because the JS embed dependency is coming from a CDN and vega-embed's package.json says the patch fix is within semver. The CDN esm.sh let's you pin an exact dependency version in your import URL, so you can fix this bug by changing the import in

-- import embed from "https://cdn.jsdelivr.net/npm/vega-embed@6/+esm";
++ import embed from "https://esm.sh/vega-embed@6?deps=vega@5.26.0";

[jonmmease]

Thanks for the report. Interesting, when I pull 5.26.1 from https://esm.sh/vega-embed@6?deps=vega@5.26.1 it works as well.

[manzt]

Interesting. Maybe something else is going on, sorry I don't have the time to dig into it more deeply.