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Bug with optional type narrowing #13670

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johnfn opened this issue Jan 25, 2017 · 1 comment
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Bug with optional type narrowing #13670

johnfn opened this issue Jan 25, 2017 · 1 comment
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@johnfn
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johnfn commented Jan 25, 2017 

function foo() {
  let x = Math.random() > 0.5 ? "" : undefined;

  if (!x) {
    return;
  }

  setTimeout(() => { x }); // x is inferred to be number | undefined;
}
@HerringtonDarkholme
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HerringtonDarkholme commented Jan 25, 2017 •
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#9998 / #11498 / #13572 (comment)

@RyanCavanaugh RyanCavanaugh added the Duplicate An existing issue was already created label Jan 25, 2017
@microsoft microsoft locked and limited conversation to collaborators Jun 19, 2018
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@johnfn @HerringtonDarkholme @RyanCavanaugh