microsoft / microsoft/TypeScript

Default type imported with `import type` from not-found module not flagged when used as a value

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Description

🔎 Search Terms

cannot be used as a value because it was imported using import type

🕗 Version & Regression Information
  • This is the behavior in every version I tried
⏯ Playground Link

https://www.typescriptlang.org/play?ts=5.4.2#code/JYWwDg9gTgLgBDAnmApnAKnAZlCIBQA9IXAAIwDOAtCgB6oDGMNUuU+ccA5CBACZcA3PnwMIAOwrx4AXgzD8oSLDgBvJKjgBVAL7ZcBYmUo16KJizYduvAQrGT4AVzhytwoA

💻 Code
import type T from
// @ts-expect-error
  'mod';

const t = T;

import {type U} from
// @ts-expect-error
  'mod';

const u = U;
🙁 Actual behavior

TS does not error on the usage of T.

TS errors on the usage of U with the error

'U' cannot be used as a value because it was imported using 'import type'.(1361)

🙂 Expected behavior

TS errors on the usage of T with the error

'T' cannot be used as a value because it was imported using 'import type'.(1361)

TS errors on the usage of U with the error

'U' cannot be used as a value because it was imported using 'import type'.(1361)

Additional information about the issue

No response

Contributor guide

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First steps

  1. Read the whole issue, then the project's contributing guide.
  2. Comment on the issue to say you are picking it up — it saves two people doing the same work.
  3. Fork the repository and make your change on a branch.
  4. Open a pull request that references the issue number.

Research direction

Start with the linked TypeScript Playground reproduction and compare the default import type T case with the named import {type U} case. Trace the type-checking path for value usage of imported symbols, then add coverage showing that both usages produce diagnostic 1361.

Written by the indexing model from the issue text.

Assessment

Tech stack
typescript
Domain
compilers
Issue type
Bug
Difficulty
4/5
Estimated time
3-5 days
Activity status
Stale
Clarity
Clearly specified
Newbie friendliness
35/100

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