The codesandbox demo could not run!

[dangkhoipro]

Have you read the Contributing Guidelines on issues?

• I have read the Contributing Guidelines on issues.

Description

The codesandbox demo link throws an error. I think you should fix this bug as soon as possible.
Step to re-produce:

• Open docusaurus.io
• Click Try a Demo button
• Check the terminal result
  

Self-service

• I'd be willing to address this documentation request myself.

[homotechsual]

A v3 config.ts file is present in the sandbox with v2 dependencies.

[homotechsual]

Seems like CodeSandbox isn't running a fresh install when building the sandbox so they are getting cached v2 packages with a v3 site structure. Not sure what we'd need to do on this one or if it can be solved from our end.

[dangkhoipro]

I think yarn.lock is outdated. So I remove the old file, re-run again, remove some js file (because the sandbox version I check is typescript), and bump it works!
I'm not sure if I covered all the errors, but here is the forked sandbox I modified.