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Boolean() function is not working with type-guard. #30321

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rockmandash opened this issue Mar 11, 2019 · 1 comment
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Boolean() function is not working with type-guard. #30321

rockmandash opened this issue Mar 11, 2019 · 1 comment
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@rockmandash
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When I call Boolean() function to test a union type, it doesn't have type-guard working.
Here is a simple code and VSCode screenshot.

image

function test(number: number | undefined) {
  if (Boolean(number)) {
    console.log(number)
  }
}
@jack-williams
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Duplicate of #16655, and there is an open PR fixing this here: #29955

@DanielRosenwasser DanielRosenwasser added the Duplicate An existing issue was already created label Mar 11, 2019
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@DanielRosenwasser @jack-williams @rockmandash