ResolvedModuleWithFailedLookupLocations does not publicly expose failedLookupLocations

[alxhub]

TypeScript Version: 3.3.0-dev.20181130

Search Terms: ResolvedModuleWithFailedLookupLocations, failedLookupLocations

Expected behavior: ts.ResolvedModuleWithFailedLookupLocations has a failedLookupLocations property which reports locations where the lookup was tried and failed.

Actual behavior: failedLookupLocations is marked @internal and thus not available in the public typings. This is in contrast to ResolvedTypeReferenceDirectiveWithFailedLookupLocations which does expose the failedLookupLocations, which leads me to believe this was an omission and not an intentional hiding of the field.

Related Issues: #28276

[sheetalkamat]

#13139 explicitly marked failedLookupLocations as internal since its implementation detail. Infact I think it missed doing it for ResolvedTypeReferenceDirectiveWithFailedLookupLocations

[alxhub]

Thank you for the information! In that case I would suggest maybe changing the type name, as it was surprising to me that a return value of type ResolvedModuleWithFailedLookupLocations did not actually have failedLookupLocations.

[Kinrany]

I also had this issue. My use case is a script that replaces "classic" imports with "node": I was trying to use ts.classicNameResolver's lookup locations for debug output.

[HoldYourWaffle]

I would also love to have access to this. My use case would be debugging and showing helpful error messages to users.