clerk/javascript @clerk/clerk-react@5.21.0 on GitHub

Adds support for a fallback prop on Clerk's components. This allows rendering of a placeholder element while Clerk's components are mounting. Use this to help mitigate layout shift when using Clerk's components. Example usage: (#4723) by @BRKalow
```
<SignIn fallback={<LoadingSkeleton />} />
```
Allow <SignInButton />, <SignUpButton />, <SignOutButton />, and <SignInWithMetamaskButton /> to render while clerk-js is still loading. This reduces any layout shift that might be caused by these components not rendering immediately. (#4810) by @BRKalow