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## Current Behavior
<!-- This is the behavior we have today -->
Exports defined in `package.json` of packages could be objects rather
than strings such that we could see both:
```json
{
"exports": {
".": {
"default": "./src/index.js"
},
"index": {
"default": {
"default": "./src/index.js"
}
}
}
}
```
## Expected Behavior
<!-- This is the behavior we should expect with the changes in this PR
-->
The logic currently assumes it can only be a string.
Ensure it checks if an object exists first
## Related Issue(s)
<!-- Please link the issue being fixed so it gets closed when this is
merged. -->
Fixes#28129
bc5d5efe58