Docs: Package requires Node 24

[TimonLukas]

Hey, thanks for creating such a useful package! When following your README with a dummy project, tsdown didn't run correctly:

ℹ tsdown v0.15.9 powered by rolldown v1.0.0-beta.44

 ERROR  SyntaxError: Unexpected identifier 'I'

 ELIFECYCLE  Command failed with exit code 1.

Turns out this is caused by this using line. Not a big issue, updating to Node 24 made it run without further errors.

It would probably be good to add a notice to the README, and maybe to declare the requirement in package.json under engines: https://docs.npmjs.com/cli/v11/configuring-npm/package-json#engines

Let me know if you'd like a PR!

[nuno-am]

Would replacing with it with:

const I = new Instrumentation();

solve it?

I'm running some projects that still haven't migrated to Node 24, and this is a bit of blocker.

[TimonLukas]

@nuno-am It's not completely equivalent. using means that, once leaving the current scope, Symbol.dispose will be called. Luckily @tailwindcss/node polyfills the symbols, so I'm pretty sure you could replicate this by wrapping these lines in a try / finally, and calling I[Symbol.dispose]() in the finally block:

const I = new Instrumentation();

try {
    I.start('[@tailwindcss/tsdown] Generate CSS');
    // ... other code ...
    return {
        code: result.code,
        map: result.map
    };
} finally {
    I[Symbol.dispose]();
}

Performance could suffer a tiny bit, but probably not enough to be noticeable.

[bosh-code]

Hi, sorry for the late reply. Thanks for identifying the bug and the fix, I will look into implementing it soon. Otherwise, if you have a branch, I'm happy for you to make a PR.