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Dont create a union type to infer conditional type branches (#30010)

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This commit is contained in:
Wesley Wigham
2019-02-26 13:43:41 -08:00
committed by GitHub
parent 2533d8294e
commit 288851066b
5 changed files with 202 additions and 1 deletions
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3
src/compiler/checker.ts
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@@ -14519,7 +14519,8 @@ namespace ts {
inferFromTypes(getFalseTypeFromConditionalType(<ConditionalType>source), getFalseTypeFromConditionalType(<ConditionalType>target));
}
else if (target.flags & TypeFlags.Conditional) {
inferFromTypes(source, getUnionType([getTrueTypeFromConditionalType(<ConditionalType>target), getFalseTypeFromConditionalType(<ConditionalType>target)]));
inferFromTypes(source, getTrueTypeFromConditionalType(<ConditionalType>target));
inferFromTypes(source, getFalseTypeFromConditionalType(<ConditionalType>target));
}
else if (target.flags & TypeFlags.UnionOrIntersection) {
for (const t of (<UnionOrIntersectionType>target).types) {