Move substitution type elimination to getActualTypeVariable
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1 changed files with 12 additions and 9 deletions
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@ -10318,8 +10318,16 @@ namespace ts {
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return links.resolvedType;
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}
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function getActualTypeVariable(type: Type) {
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return type.flags & TypeFlags.Substitution ? (<SubstitutionType>type).typeVariable : type;
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function getActualTypeVariable(type: Type): Type {
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if (type.flags & TypeFlags.Substitution) {
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return (<SubstitutionType>type).typeVariable;
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}
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if (type.flags & TypeFlags.IndexedAccess && (
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(<IndexedAccessType>type).objectType.flags & TypeFlags.Substitution ||
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(<IndexedAccessType>type).indexType.flags & TypeFlags.Substitution)) {
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return getIndexedAccessType(getActualTypeVariable((<IndexedAccessType>type).objectType), getActualTypeVariable((<IndexedAccessType>type).indexType));
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}
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return type;
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}
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/**
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@ -14860,13 +14868,8 @@ namespace ts {
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target = removeTypesFromUnionOrIntersection(<UnionOrIntersectionType>target, matchingTypes);
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}
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}
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else if (target.flags & TypeFlags.Substitution) {
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target = (target as SubstitutionType).typeVariable;
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}
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else if (target.flags & TypeFlags.IndexedAccess && (
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(<IndexedAccessType>target).objectType.flags & TypeFlags.Substitution ||
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(<IndexedAccessType>target).indexType.flags & TypeFlags.Substitution)) {
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target = getIndexedAccessType(getActualTypeVariable((<IndexedAccessType>target).objectType), getActualTypeVariable((<IndexedAccessType>target).indexType));
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else if (target.flags & (TypeFlags.IndexedAccess | TypeFlags.Substitution)) {
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target = getActualTypeVariable(target);
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}
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if (target.flags & TypeFlags.TypeVariable) {
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// If target is a type parameter, make an inference, unless the source type contains
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