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Interface unions type checking #17256

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Closed
Interface unions type checking#17256

Description

@jspri
Justin (jspri)
opened on Jul 18, 2017

TypeScript Version: 2.4.0

Code

interface Foo {
  a: string;
}

interface Bar extends Foo {
  b: string;
  c: string;
}

// d is neither foo nor bar!
const d: Foo | Bar = {
  a: 'lol',
  b: 'kek',
};

Expected behavior:

You would expect the code above to throw an error as d can not be resolved to type foo or type bar.

Actual behavior:

Code compiles without error.

Activity

  1. jcalz commented on Jul 18, 2017

    @jcalz
    Joe Calzaretta (jcalz)
    on Jul 18, 2017
    Contributor

    duplicate of #14383?

  2. Joe Calzaretta (jcalz)
    marked this as a duplicate of Possible bug: Hybrid between two interfaces of a union passes type checking #14383 on Jul 18, 2017

  3. jspri commented on Jul 18, 2017

    @jspri
    Justin (jspri)
    on Jul 18, 2017
    Author

    Yeah, thanks.

  4. Justin (jspri)
    closed this as completedon Jul 18, 2017
  5. microsoft
    locked and limited conversation to collaborators on Jun 14, 2018
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