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fix: externalize useSyncExternalStore shim to fix App Router crash #760

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Merged
jhuleatt merged 1 commit into from
Jul 24, 2026
Merged

fix: externalize useSyncExternalStore shim to fix App Router crash #760

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6 changes: 6 additions & 0 deletions vite.config.ts
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Original file line number Diff line number Diff line change
Expand Up @@ -12,6 +12,12 @@ console.log(`ReactFire v${version}`);

const externals = [
'react',
// Externalize the useSyncExternalStore shim so the consumer's bundler resolves it.
// Bundling this CJS module into the ESM output makes rolldown emit a dynamic require()
// that throws ("dynamic usage of require is not supported") when a reactfire data hook
// loads client-side in a Next.js App Router (strict ESM) context. Externalizing keeps
// the shim's React 16/17 fallback intact while removing the require from our dist.
'use-sync-external-store/shim',
'firebase',
'firebase/app',
'firebase/firestore',
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