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Generics with 'extends' for return types cause type check failure. #13993

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Generics with 'extends' for return types cause type check failure.#13993
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Description

@na-o-ys
na-o-ys
opened on Feb 10, 2017

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.

Activity

  1. zpdDG4gta8XKpMCd commented on Feb 10, 2017

    @zpdDG4gta8XKpMCd
    ZpdDG4gta (zpdDG4gta8XKpMCd)
    on Feb 10, 2017

    Ryan Cavanaugh (@RyanCavanaugh) is there any chance to fix assignability checks for generic and do it properly? not sure which issue tracks it (there are way to many)

  2. Ryan Cavanaugh (RyanCavanaugh)
    added
    Needs InvestigationThis issue needs a team member to investigate its status.
    on May 24, 2017
  3. Anders Hejlsberg (ahejlsberg)
    added
    FixedA PR has been merged for this issue
    on Aug 15, 2017

  4. ahejlsberg commented on Aug 15, 2017

    @ahejlsberg
    Anders Hejlsberg (ahejlsberg)
    on Aug 15, 2017
    Member

    Fixed by #16368.

  5. Anders Hejlsberg (ahejlsberg)
    closed this as completedon Aug 15, 2017
  6. microsoft
    locked and limited conversation to collaborators on Jun 19, 2018
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