Support array values in findBy filter for multiple authors

[reatlat]

Summary

• Enhance the findBy filter in eleventy.config.js to support array values, enabling fields like author to list multiple authors
• Update FreshJuice starters to use ["freshjuice-dev", "reatlat"] as a real-world use case

Problem

Currently, starters (and plugins) can only have a single author string. This means a project with multiple contributors can only appear on one author's page.

Solution

Add an Array.isArray() check to the findBy function so that when a field value is an array, it matches if any element in the array equals the search value. This is fully backward-compatible — existing string values continue to work unchanged.

// Before (string only)
"author": "freshjuice-dev"

// After (string or array)
"author": ["freshjuice-dev", "reatlat"]

Test plan

• Verified locally that array-based authors render correctly on both author pages
• Confirmed existing single-string authors are unaffected
• Case-insensitive matching works for array elements

[Ryuno-Ki]

This might lead to some issues down the line (Turkish-I problem).

I recommend using localeCompare instead.

[reatlat]

Great catch, thanks! Switched to localeCompare with { sensitivity: "base" } in both the array and string comparison paths.

[Ryuno-Ki]

LGTM (But I don't have permissions to actually get this PR in)

[reatlat]

Hey @zachleat and @Snapstromegon, just wanted to kindly bump this PR. It's been open for a bit and I'd love to get your eyes on it when you have a moment.

The change is fairly small, it adds array support to the findBy filter so starters/plugins can list multiple authors. It's fully backward-compatible and I've addressed the review feedback from @Ryuno-Ki on locale-safe comparison.

Thanks for all the amazing work on 11ty, really appreciate your time! Let's Build Awesome 🟢