microsoft / microsoft/TypeScript

ConstructorParameters<T> should suggest `typeof T` when T is a reference to classes

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Description

🔎 Search Terms

"ConstructorParameters", "Type provides no match for the signature 'new (...args: any): any'."

🕗 Version & Regression Information
  • This is the behavior in every version I tried, and I reviewed the FAQ for entries about _________
⏯ Playground Link

https://www.typescriptlang.org/play?useDefineForClassFields=true&target=9&module=1&noImplicitUseStrict=true&ts=5.4.0-dev.20240120#code/MYGwhgzhAEBiD29oG8C+AoALgTwA4FNoBhTeAJ2gF4VoA7fAdwAoA6NsMgcwgC5j5aETGQCuwUmQAKHMAFt8mfGQgAeBPAB8ASj7roqIA

💻 Code
class Foo {}
type Ctor = { new(...args: ConstructorParameters<Foo>): Foo }
🙁 Actual behavior

The error message is

Type 'Foo' does not satisfy the constraint 'abstract new (...args: any) => any'.
  Type 'Foo' provides no match for the signature 'new (...args: any): any'.

And no suggestion is provided.

🙂 Expected behavior

The compiler should suggest Did you mean 'typeof Foo'?

Additional information about the issue

No response

Contributor guide

Open the contributing guide

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 by reproducing the diagnostic in the linked TypeScript Playground using the provided class and ConstructorParameters example. Trace the compiler behavior responsible for this error and determine how the suggestion is produced; done means the diagnostic suggests typeof Foo for this case.

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
Mostly clear
Newbie friendliness
45/100

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