TS:1379 An import alias cannot reference a declaration that was exported using 'export type'

Bug Report

🔎 Search Terms

TS1379
An import alias cannot reference a declaration that was exported using 'export type'

🕗 Version & Regression Information

This has always been the behavior as far as I can tell (edit: tested on all versions listed in playground back to >3.7.5 (changed to export type {...} statement when needed))

⏯ Playground Link

Multi file: repro but I will show in playground.

Below are pictures that might be easier to parse

💻 Code

When annotated with type it errors

When not annotated with type it doesn't error:

🙁 Actual behavior

Exports of types annotated with type error while those not annotated as types do not error even though TS understand it is still a type.

🙂 Expected behavior

Honestly I don't know which of these behaviors is correct - this behavior could be completely intentional as well - intuitively I think these should match and I prefer the behavior with no errors but it is unclear to me if this is an emit issue? I'm sorry if this behavior is on purpose and I have wasted your time. Really appreciate the work!

Start with the linked multi-file TypeScript Playground reproduction and compare the annotated and unannotated import-alias cases that produce TS1379. First determine whether the differing diagnostics are intentional or an emit/type-checking defect; done means the expected behavior is established and covered by an appropriate regression test.