Interfaces should extend Record<string, unknown>

[antoine-morvan]

Bug Report

🔎 Search Terms

interface type intheritance Record unkown any

🕗 Version & Regression Information

This is a behavior that I have been able to observe on 3.9.3 & 4.2.4. I also reproduced it on the different versions of the playground.

⏯ Playground Link

Playground link with relevant code

💻 Code

interface Test0 { name: string }

type Res0 = Test0 extends Record<string, unknown> ? 'yes' : 'no'  // "no"
type Res1 = Test0 extends Record<string, any> ? 'yes' : 'no'  // "yes"

type Test1 = { name: string }

type Res2 = Test1 extends Record<string, unknown> ? 'yes' : 'no'  // "yes"
type Res3 = Test1 extends Record<string, any> ? 'yes' : 'no'  // "yes"

🙁 Actual behavior

The type Res0, testing if the interface extends Record<string, unkown> is resolved to "no", whereas the its type counterpart resolves to "yes" (Res2).

🙂 Expected behavior

I believe unkown encompasses any when testing such type scructure. Thus I expect Res0 to resolve to "yes", i.e. an interface extends Record<string, unkown>.

[MartinJohns]

Duplicate of #42825. Used search terms: interface extends record unknown

[typescript-bot]

This issue has been marked as a 'Duplicate' and has seen no recent activity. It has been automatically closed for house-keeping purposes.