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symbols in type guards

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Jason Freeman
2015-02-06 21:32:37 -08:00
parent 9f39a5388a
commit df826de042
10 changed files with 171 additions and 1 deletions
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src/compiler/checker.ts
+1 -1
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@@ -4767,7 +4767,7 @@ module ts {
if (assumeTrue) {
// Assumed result is true. If check was not for a primitive type, remove all primitive types
if (!typeInfo) {
return removeTypesFromUnionType(type, /*typeKind*/ TypeFlags.StringLike | TypeFlags.NumberLike | TypeFlags.Boolean, /*isOfTypeKind*/ true);
return removeTypesFromUnionType(type, /*typeKind*/ TypeFlags.StringLike | TypeFlags.NumberLike | TypeFlags.Boolean | TypeFlags.ESSymbol, /*isOfTypeKind*/ true);
}
// Check was for a primitive type, return that primitive type if it is a subtype
if (isTypeSubtypeOf(typeInfo.type, type)) {