[3.8 alpha] Use within Codesandbox is broken

[alessbell]

Issue Description

When building a demo with a snapshot release for a branch off of release-3.8, I came across this error:

It seems to be caused by a breaking change to how optimism is generating sourcemaps in the version we bumped it to in 0.17.0: locally it warns in the console, but Codesandbox throws an error. I'll look at the upstream fix, but also created an issue here so we don't lose track of this one, since we'll need to either bump the version once that PR lands or roll back before releasing.

Link to Reproduction

https://codesandbox.io/s/beautiful-lucy-z82hul?file=/package.json

Reproduction Steps

No response

[jerelmiller]

#10886 was also reported. I'm going to leave that one open for now since its affecting v3.7.x

[alessbell]

Replied over there, too, but these look like two different issues.

[jerelmiller]

Ah thank you. I saw some of the same modules in the stack trace and thought they were related. Appreciate the assist!

[alessbell]

Was closed by #10888.

[github-actions]

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