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a strict equal comparison to undefined doesn't narrow in Array.filter #14966

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zpdDG4gta8XKpMCd opened this issue Apr 1, 2017 · 1 comment
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a strict equal comparison to undefined doesn't narrow in Array.filter #14966

zpdDG4gta8XKpMCd opened this issue Apr 1, 2017 · 1 comment
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const filtered = ['a', undefined].filter(x => x !== undefined); // expected string[], actual (string | undefined)[]
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Duplicate #5101

@RyanCavanaugh RyanCavanaugh added the Duplicate An existing issue was already created label Apr 3, 2017
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