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this subclass inference problem #26071

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JonathanMEdwards opened this issue May 5, 2017 · 1 comment
Closed

this subclass inference problem #26071

JonathanMEdwards opened this issue May 5, 2017 · 1 comment

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@JonathanMEdwards
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JonathanMEdwards commented May 5, 2017 •
edited
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  • VSCode Version: Code 1.12.1 (f6868fc, 2017-05-04T21:18:32.269Z)
  • OS Version: Darwin x64 16.5.0
  • Extensions:
Extension Author Version
ExtensionUpdateCheck HookyQR 0.0.2
vscode-npm-script eg2 0.1.9
auto-close-tag formulahendry 0.3.12
backspace-plusplus jrieken 0.0.15
Theme-MaterialKit ms-vscode 0.1.4
debugger-for-chrome msjsdiag 3.1.1
theme-black-plus none 0.0.1
theme-visualstudio black none 0.0.1

Steps to Reproduce:

class A {
  foo = 0;
  method() {
    if (this instanceof B) {
      this.foo;
    } else {
      this.foo;
    }
  }
}
class B extends A {
}

Produces error:

'Property 'foo' does not exist on type 'never'.'
@mjbvz
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mjbvz commented May 5, 2017

This issue was moved to microsoft/TypeScript#15615

@mjbvz mjbvz mentioned this issue May 5, 2017
Closed
@mjbvz mjbvz closed this as completed May 5, 2017
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2 participants
@JonathanMEdwards @mjbvz