Interface doesn't extends Record<string, unknown>

[erwanvivien]

Bug Report

Simple interface doesn't extends Record<string, unknown>

We can't use extends object because it's for any JS object, it's not good

🔎 Search Terms

Interface extends Record unknown

🕗 Version & Regression Information

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

⏯ Playground Link

https://www.typescriptlang.org/play?#code/C4TwDgpgBAsg9gNwgFXNAvFA3lAHgLigDsBXAWwCMIAnAGihENMpqgF8AoASyOBoDMAhgGNo8JAEleAkdBwFi5KnQZMlrTh2FwiAZ2BQuugBoBNKJgAUgwgCUI26gBMAPPuo8A5vRJEA1kRwAO5EAHwAlISChrrYeGosKoyKiewWodgcUFDUEMAk1ERQwNQkEByaADZ5xYTiKGgWcQoADPTJLewc1QZcdYgQUnzUQqJN8oRtqlCdmkZmlsDh3CamllzLQA

💻 Code

type MoveType = { x: number, y: number }
interface MoveInterface { x: number, y: number }

const isXY = (a: Record<string, unknown>): a is { x: number, y: number } => {
  return true
}

let t: MoveType = { x: 0, y: 0 }
let i: MoveInterface = { x: 0, y: 0 }

isXY(t)
isXY(i)

🙁 Actual behavior

We can use isXY for the type, not for the interface

🙂 Expected behavior

Can use isXY(i)

[MartinJohns]

Duplicate of #42825. This is working as intended.

[erwanvivien]

Thanks @MartinJohns I tried to check if this error was known and didn't found this issue, I'm closing this one