InstanceOf incorrectly narrow when parameter contains type parameter #10423

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yuit opened this issue Aug 18, 2016 · 1 comment

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yuit commented Aug 18, 2016

Version: master

class Node { name: string; }
class NodeList extends Node { }

function f<T extends Node>(n: T) {
    if (!(n instanceof NodeList)) {
        n // Never, but should be Node
    }
}

yuit added the Bug label

Contributor Author

yuit commented Aug 19, 2016

This is a duplicate of #10422

yuit closed this as completed

yuit added the Duplicate label

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