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Ensure no duplicates in named union list

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This commit is contained in:
Anders Hejlsberg 2021-02-24 09:48:26 -08:00
parent 26bbdf1173
commit 361e19bbe8
1 changed files with 1 additions and 1 deletions
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2
src/compiler/checker.ts
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@ -13460,7 +13460,7 @@ namespace ts {
if (t.flags & TypeFlags.Union) { if (t.flags & TypeFlags.Union) {
const origin = (<UnionType>t).origin; const origin = (<UnionType>t).origin;
if (t.aliasSymbol || origin && !(origin.flags & TypeFlags.Union)) { if (t.aliasSymbol || origin && !(origin.flags & TypeFlags.Union)) {
namedUnions.push(t); pushIfUnique(namedUnions, t);
} }
else if (origin && origin.flags & TypeFlags.Union) { else if (origin && origin.flags & TypeFlags.Union) {
addNamedUnions(namedUnions, (<UnionType>origin).types); addNamedUnions(namedUnions, (<UnionType>origin).types);