Animation keyframes in config are not supported

[jancbeck]

Describe the bug

Custom keyframes defined in tailwind.config.js are not included in the CSS output.

Your minimal, reproducible example

https://github.com/jancbeck/tailwindcss-themer-keyframes-issue/tree/keyframes-issue

Steps to reproduce

1. clone repro repo, checkout keyframes-issue branch
2. cd examples/create-react-app-typescript && npm i
3. npm start view in browser

Expected behavior

The React logo should be animated since custom keyframes for App-logo-spin have been defined in the TW config

How often does this bug happen?

Every time

Screenshots or Videos

No response

Platform

• OS: MacOS 15.1
• Browser: Chrome (130.0.6723.71)

tailwindcss-themer version

v4.1.0

Additional context

Checkout the keyframes-default branch to see how it works in TW when not using this plugin
https://github.com/jancbeck/tailwindcss-themer-keyframes-issue/tree/keyframes-default

[jancbeck]

looks like not only are the keyframes in the theme not applied, but even when defining them in the normal extend object, they are no longer preserved while themer is installed
https://github.com/jancbeck/tailwindcss-themer-keyframes-issue/blob/keyframes-extend-ignored/examples/create-react-app-typescript/tailwind.config.js