feat(clerk-js): Add bundleless ESM build

[dstaley]

Description

(This PR is technically a draft; the pr.pkg.new workflow doesn't run on draft PRs.)

This experimental PR adds support for building a "bundleless" version of clerk-js, specifically the ESM build. More details to come if this experiment proves successful!

Checklist

• pnpm test runs as expected.
• pnpm build runs as expected.
• (If applicable) JSDoc comments have been added or updated for any package exports
• (If applicable) Documentation has been updated

Type of change

• 🐛 Bug fix
• 🌟 New feature
• 🔨 Breaking change
• 📖 Refactoring / dependency upgrade / documentation
• other:

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Latest commit: 8d463e2

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Name	Status	Preview	Comments	Updated (UTC)
clerk-js-sandbox	✅ Ready (Inspect)	Visit Preview	💬 Add feedback	May 19, 2025 8:53pm

[panteliselef]

Could this be a breaking change in some cases ?

[dstaley]

I think this would only break if someone was importing directly from dist/. The only reason this is in a folder is because Rslib will, for some reason, run on all files in the input folder. So it would emit index.browser.js which was confusing. Not a strong suggestion that we do it this way, just wanted to get it working for experimental purposes!

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commit: 8d463e2

[dstaley]

currently blocked by web-infra-dev/rslib#1007 and web-infra-dev/rslib#882