"@source not "..." gives an error Error: `@source` paths must be quoted.

[kmccrory-grx]

What version of Tailwind CSS are you using?

4.0.16

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

next 14.2

What version of Node.js are you using?

20.14

What browser are you using?

For example: Chrome, Safari, or N/A

What operating system are you using?

mac

Reproduction URL

n/a

Describe your issue
IM trying to use the new @source not "..." directive. whatever i add into the not line, our build will fail saying
Error: '@source' paths must be quoted.

error dissapears when i remove the not

[philipp-spiess]

Hey! Source not stuff is not released yet, it's currently merged behind a feature flag so you can either use the unstable version or wait for a bit as we're wrapping up for a release shortly 👍

[kmccrory-grx]

whoops! lol i guess i was too early

[federicocappellotto97]

@philipp-spiess How can i use @source not based on an env variable? I want to exclude some content only when NODE_ENV is 'production'