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Fix narrowTypeBySwitchOnDiscriminant function

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Anders Hejlsberg
2017-12-23 19:12:49 -08:00
parent 2143a3f439
commit 5d3ecaebad
1 changed files with 1 additions and 1 deletions
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2
src/compiler/checker.ts
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@@ -12914,7 +12914,7 @@ namespace ts {
const discriminantType = getUnionType(clauseTypes);
const caseType =
discriminantType.flags & TypeFlags.Never ? neverType :
replacePrimitivesWithLiterals(filterType(type, t => isTypeComparableTo(discriminantType, t)), discriminantType);
replacePrimitivesWithLiterals(filterType(type, t => areTypesComparable(discriminantType, t)), discriminantType);
if (!hasDefaultClause) {
return caseType;
}