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CFA doesn't work with generic constraint type #30316

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cevek opened this issue Mar 11, 2019 · 1 comment
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CFA doesn't work with generic constraint type #30316

cevek opened this issue Mar 11, 2019 · 1 comment
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@cevek
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cevek commented Mar 11, 2019

TypeScript Version: 3.4.0-dev.20190307

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Code

function foo<K extends 'a' | 'b'>(k: K) {
  if (k === 'a') {
     const x: 'a' = k; // Type 'K' is not assignable to type '"a"
  }
}

Expected behavior:

Actual behavior:

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@jack-williams
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Related: #20375

@RyanCavanaugh RyanCavanaugh added the Duplicate An existing issue was already created label Mar 12, 2019
@cevek cevek closed this as completed Mar 13, 2019
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@cevek @jack-williams @RyanCavanaugh