Upgrade cli does not output line height separately from the fontsize array

[johurul-haque]

What version of Tailwind CSS are you using?

v4.1.3

What build tool (or framework if it abstracts the build tool) are you using?

Next.js 15.2.5

What version of Node.js are you using?

For example: v22.14.0

What browser are you using?

Chrome

What operating system are you using?

Ubuntu Linux (24.10)

Reproduction URL

/

Describe your issue

In tailwind config, we could do something like this:

extend: {
  fontSize: {
    "title-custom": ["50px", "62px"]
  }
}

Which would generate

.title-custom {
  font-size: 50px;
  line-height: 62px;
}

Upgrading to v4, the cli outputs

 --text-title-custom: 50px, 62px;

And it does not generate any classes.

Expected Behaviour

The cli should treat the second element of the array as line-height and add a new variable for it rather than adding it to one variable separated by a comma.

--text-title-custom: 50px;
--text-title-custom--line-height: 62px;

[philipp-spiess]

Thanks for the bug report. Because of @wongjn's quick fix, this is going to be resolved with the next patch release 👍