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Infer Type of Array after Filter #7985

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michaelmesser opened this issue Apr 9, 2016 · 1 comment
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Infer Type of Array after Filter #7985

michaelmesser opened this issue Apr 9, 2016 · 1 comment
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@michaelmesser
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TypeScript Version:

Lastest Commit

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const a = [5, 6, "7", "8"]
const b = a.filter(x => typeof x === "number")

Expected behavior:
b is number[]
Actual behavior:
b is (number|string)[]
@DanielRosenwasser DanielRosenwasser added the Duplicate An existing issue was already created label Apr 9, 2016
@DanielRosenwasser
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Looks like a duplicate of #7657.

@microsoft microsoft locked and limited conversation to collaborators Jun 19, 2018
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@DanielRosenwasser @michaelmesser