chore(expo): TypeScript 6.0 compatibility

[dstaley]

Description

This PR updates @clerk/expo to be compatible with TypeScript 6.0 by migrating to tsdown. It included updating the lib config to es2019 from es6 to support Array.flat and Array.includes, along with replacing instances of global with globalThis.

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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Project	Deployment	Actions	Updated (UTC)
clerk-js-sandbox	Ready	Preview, Comment	Mar 30, 2026 3:51pm

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Latest commit: 919bc53

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[wobsoriano]

looks good here, but deferring to @chriscanin

[chriscanin]

@wobsoriano @dstaley , this is looking good, I have spent a little time to build and test, and verify the removal of the legacyoutput: true does not break anything. The code is looking good, and this should be safe to merge in.

[chriscanin]

Looking good, working well. Tested and verified nothing is breaking.