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## Current Behavior
<!-- This is the behavior we have today -->
When re-mapping a TS path mapping like `"@foo/lib1/plugins/some-file":
["packages/lib1/src/plugins/some-file.ts"]`, it results in:
```json
"@foo/lib1/plugins/some-file": [
"dist/packages/lib1/plugins/some-file",
"dist/packages/lib1/src/plugins/some-file.ts"
]
```
The first path is wrong because it's missing the `src` directory, and
the second one has a file extension that's not in the output.
## Expected Behavior
<!-- This is the behavior we should expect with the changes in this PR
-->
When re-mapping a TS path mapping like `"@foo/lib1/plugins/some-file":
["packages/lib1/src/plugins/some-file.ts"]`, it should result in:
```json
"@foo/lib1/plugins/some-file": [
"dist/packages/lib1/plugins/some-file",
"dist/packages/lib1/src/plugins/some-file",
"dist/packages/lib1/src/plugins/some-file.ts"
]
```
In this case, the second path would correctly point to the output. It
doesn't have an extension, which allows the compiler to pick up the
correct one.
Note that while the first and third paths are still not valid for this
specific use case, they could still be valid for other use cases, and in
any case, they're still kept for backward compatibility. The util to
re-map these paths is currently very generic and generates potentially
valid paths. The invalid paths for a given use case won't throw an error
as long as there's one that's valid.
## Related Issue(s)
<!-- Please link the issue being fixed so it gets closed when this is
merged. -->
Fixes#21699
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<!-- Please make sure that your commit message follows our format -->
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and generate it for you if appropriate. -->
## Current Behavior
<!-- This is the behavior we have today -->
## Expected Behavior
<!-- This is the behavior we should expect with the changes in this PR
-->
## Related Issue(s)
<!-- Please link the issue being fixed so it gets closed when this is
merged. -->
Fixes #
