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Primitives are assignable to weak types #16333

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Primitives are assignable to weak types#16333
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sandersn
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BugA bug in TypeScriptFixedA PR has been merged for this issue
Milestone
TypeScript 2.4.1

Description

@DanielRosenwasser
Daniel Rosenwasser (DanielRosenwasser)
opened on Jun 7, 2017
interface Weak {
  a?: any,
  b?: any,
}
let x: Weak = 10;

Expected: Error on assigning 10 to x.
Actual: No error.

Activity

  1. Daniel Rosenwasser (DanielRosenwasser)
    added
    BugA bug in TypeScript
    on Jun 7, 2017
  2. Daniel Rosenwasser (DanielRosenwasser)
    added this to the TypeScript 2.4 milestone on Jun 7, 2017
  3. Daniel Rosenwasser (DanielRosenwasser)
    assigned
    Nathan Shively-Sanders (sandersn)
    on Jun 7, 2017

  4. sandersn commented on Jun 7, 2017

    @sandersn
    Nathan Shively-Sanders (sandersn)
    on Jun 7, 2017
    Member

    This happens because the apparent type of number, string, etc have toString, and toString is a known property of every object type, which includes every weak type.

  5. sandersn commented on Jun 7, 2017

    @sandersn
    Nathan Shively-Sanders (sandersn)
    on Jun 7, 2017
    Member

    Fixed in #16343

  6. Nathan Shively-Sanders (sandersn)
    added
    FixedA PR has been merged for this issue
    on Jun 7, 2017
  7. Mohamed Hegazy (mhegazy)
    modified the milestones: TypeScript 2.4, TypeScript 2.4.1 on Jun 8, 2017
  8. Nathan Shively-Sanders (sandersn)
    closed this as completedin #16343on Jun 9, 2017
  9. microsoft
    locked and limited conversation to collaborators on Jun 14, 2018
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