PlainTime.toString() throws error on Next.js production builds

[cbodin]

Minimal reproducible example:
https://codesandbox.io/p/devbox/temporal-polyfill-nextjs-bug-7n38kr?file=%2Fapp%2Fpage.tsx

Running npm run dev works as expected, npm run build-start will throw an error when clicking the button.

[arshaw]

Thanks for the report @cbodin. After some frustrating debugging, I've found this is a minification bug in Next's SWC.

If you set swcMinify: false in your next.config.js, you'll see the problem goes away.

I need to further reduce where the problem is happening. In temporal-polyfill's sourcecode, somewhere near the array spread in formatPlainTimeIso.

[arshaw]

^^See above issue in swc

[arshaw]

Very soon after I reported this bug to SWC, they fixed it.

Also, I created an easy workaround for older versions of SWC/Next.js and released it in v0.2.4