Skip to content

Type guard doesn't work on import #12081

Closed
Closed
Type guard doesn't work on import#12081
Assignees
sandersn
Labels
BugA bug in TypeScriptFixedA PR has been merged for this issue
Milestone
TypeScript 2.7

Description

@ghost
ghost
opened on Nov 7, 2016

TypeScript Version: nightly (2.1.0-dev.20161107)

Code

// @strictNullChecks: true

// @Filename: /node_modules/@types/foo/index.d.ts
declare const foo: { x: number } | undefined;
export default foo;

// @Filename: /a.ts
import foo from "foo";
foo && foo.x;

Expected behavior:

No error.

Actual behavior:

error TS2532: Object is possibly 'undefined'.

Activity

  1. ghost added
    BugA bug in TypeScript
    on Nov 7, 2016
  2. Mohamed Hegazy (mhegazy)
    added this to the TypeScript 2.2 milestone on Dec 7, 2016
  3. Mohamed Hegazy (mhegazy)
    assigned
    Nathan Shively-Sanders (sandersn)
    on Dec 7, 2016
  4. Mohamed Hegazy (mhegazy)
    modified the milestones: TypeScript 2.2, TypeScript 2.3 on Feb 2, 2017
  5. Mohamed Hegazy (mhegazy)
    modified the milestones: TypeScript 2.3, on Mar 24, 2017
  6. ghost added
    FixedA PR has been merged for this issue
    on Jun 20, 2017
  8. Mohamed Hegazy (mhegazy)
    closed this as completedon Nov 21, 2017

  9. mgroenhoff commented on Nov 21, 2017

    @mgroenhoff
    Melvin Groenhoff (mgroenhoff)
    on Nov 21, 2017

    Awesome. Thanks! 👍

  10. Mohamed Hegazy (mhegazy)
    modified the milestones: , TypeScript 2.7 on Nov 21, 2017
  11. microsoft
    locked and limited conversation to collaborators on Jun 19, 2018
Sign up for free to join this conversation on GitHub. Already have an account? Sign in to comment

Metadata

Metadata

Assignees

Labels

BugA bug in TypeScriptFixedA PR has been merged for this issue

Type

No type

Projects

No projects

    Milestone

    Relationships

    None yet

    Development

    No branches or pull requests

    Issue actions