Error: e.map is not a function

[dstansby]

I'm trying to get an up to date version of pydata-sphinx-theme working with Matplotlib (matplotlib/matplotlib#27658). With the current main branch of pydata-sphinx-theme search/theme changing/version switching isn't working, and I think this is because of the javascript error we're getting,

Uncaught (in promise) TypeError: e.map is not a function
    g https://output.circle-artifacts.com/output/job/65bed756-88de-4a26-93f0-3d06e9d8950f/artifacts/0/doc/build/html/_static/scripts/pydata-sphinx-theme.js?digest=2f715a4ca1682955a1c0:1
    937 https://output.circle-artifacts.com/output/job/65bed756-88de-4a26-93f0-3d06e9d8950f/artifacts/0/doc/build/html/_static/scripts/pydata-sphinx-theme.js?digest=2f715a4ca1682955a1c0:1
[pydata-sphinx-theme.js:1:4657](https://output.circle-artifacts.com/output/job/65bed756-88de-4a26-93f0-3d06e9d8950f/artifacts/0/doc/build/html/_static/scripts/pydata-sphinx-theme.js?digest=2f715a4ca1682955a1c0)

The code that is triggering this is

const n=(e=e.map((e=>(e.match=e.version==DOCUMENTATION_OPTIONS.theme_switcher_version_match,e.preferred=e.preferred||!1,"name"in e||(e.name=e.version),e)))).map((e=>e.preferred&&e.match)).some(Boolean)

It looks like this is some minified(???) javascript, so I'm not sure how to proceed with debugging. Any pointers welcome (is there a way to turn off the squashing of all the javascript into one line?)

A doc build that has this error is here: https://output.circle-artifacts.com/output/job/65bed756-88de-4a26-93f0-3d06e9d8950f/artifacts/0/doc/build/html/index.html

[drammock]

Looks like here:

https://github.com/pydata/pydata-sphinx-theme/blob/99f9b1c29854ee0f88884e032acc1997dfae370e/src/pydata_sphinx_theme/assets/scripts/pydata-sphinx-theme.js#L386-399

I'm away for the next week or so, so can't be of much help right away, but maybe seeing the unminified version will be enough for you to figure it out without me 🤞

[QuLogic]

This is because the version switcher appears to be trying to load https://output.circle-artifacts.com/_static/switcher.json which is obviously going to not work. Has the option for the version switcher URL changed?

There's an if (data) { around the caller to populateVersionSwitcher, but it appears that's not a sufficient condition?