8000 Generics with 'extends' for return types cause type check failure. · Issue #13993 · microsoft/TypeScript · GitHub
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Generics with 'extends' for return types cause type check failure. #13993
@na-o-ys

Description

@na-o-ys

TypeScript Version: 2.2.0

Code

interface I { attr: string }

type M = <T extends I>() => T
const v: M = () => ({})

v().attr

Expected behavior:

Type '() => {}' is not assignable to type 'M'. Type '{}' is not assignable to type 'I'.

Actual behavior:

The compilation is successful.

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