using `alias: page` in pagination throws error

[andyford]

given this frontmatter pagination setup:

---
pagination:
    data: pages
    size: 1
    alias: page
permalink: "{{ page.slug | slug }}/"
layout: layouts/base.njk
---

Eleventy will throw the following error:

> mapB.date.getTime is not a function

`TypeError` was thrown:
    TypeError: mapB.date.getTime is not a function

This appears to be because of using the name page in alias: page.

It would be great to support alias: page without issue, but if that's not feasible, it would be nice to add this caveat to the documentation.

[pdehaan]

Ah... Yeah, page has somewhat of a special meaning in 11ty. See https://www.11ty.dev/docs/data-eleventy-supplied/.

Probably easiest to choose a slightly different alias name to avoid conflicts with the built-in page variable.

[andyford]

Probably easiest to choose a slightly different alias name to avoid conflicts with the built-in page variable.

... right but my suggestion is to either support alias: page or at least call out this caveat in the docs. Otherwise more poor souls will lose time and hair over this as the error message isn't particularly helpful

[andyford]

created a PR on the eleventy doc site to document this caveat 11ty/11ty-website#1073

[paulshryock]

I also ran into this same issue recently, and couldn't figure out why I was getting the date function error, for like a week. Changing page to item fixed it.

Definitely documentation for this would be great, but I'd also love to see a console error explaining the real problem.