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Unhelpful error message when interface ... extends number #46246

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Mr-Andersen opened this issue Oct 6, 2021 · 3 comments · May be fixed by #46357
Open

Unhelpful error message when interface ... extends number #46246

Mr-Andersen opened this issue Oct 6, 2021 · 3 comments · May be fixed by #46357
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Bug Domain: Error Messages Good First Issue Help Wanted

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@Mr-Andersen
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@Mr-Andersen Mr-Andersen commented Oct 6, 2021 •
edited by DanielRosenwasser

Bug Report

🔎 Search Terms

interface extends only refers to a type

🕗 Version & Regression Information

This is the behavior in every version I tried, and I reviewed the FAQ for entries about interface extension

⏯ Playground Link

Playground link with relevant code

💻 Code

export interface MessageId extends number {}

🙁 Actual behavior

error TS2693: 'number' only refers to a type, but is being used as a value here.

🙂 Expected behavior

Informative error about why an interface cannot extend number (or string -- the error is the same besides the type name)
@younes-io
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@younes-io younes-io commented Oct 10, 2021

I would think of a message like: an interface cannot extend a primitive type like 'number'; an interface can only extend named types and classes

What do you think?

@PurityLake
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@PurityLake PurityLake commented Oct 11, 2021

Is this issue being worked on? I would like to look into this as a first issue.

@HarsheetKakar
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@HarsheetKakar HarsheetKakar commented Oct 11, 2021

I was actually working on it, sorry I forgot to mention that earlier

@HarsheetKakar HarsheetKakar linked a pull request that will close this issue Oct 14, 2021
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Bug Domain: Error Messages Good First Issue Help Wanted
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Fix46246
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@DanielRosenwasser @younes-io @PurityLake @Mr-Andersen @HarsheetKakar