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Move substitution type elimination to getActualTypeVariable

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This commit is contained in:
Anders Hejlsberg 2019-04-30 09:23:52 -07:00
parent ed75e1d07e
commit 1818218d59
1 changed files with 12 additions and 9 deletions
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21
src/compiler/checker.ts
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@ -10318,8 +10318,16 @@ namespace ts {
return links.resolvedType;
}
function getActualTypeVariable(type: Type) {
return type.flags & TypeFlags.Substitution ? (<SubstitutionType>type).typeVariable : type;
function getActualTypeVariable(type: Type): Type {
if (type.flags & TypeFlags.Substitution) {
return (<SubstitutionType>type).typeVariable;
}
if (type.flags & TypeFlags.IndexedAccess && (
(<IndexedAccessType>type).objectType.flags & TypeFlags.Substitution ||
(<IndexedAccessType>type).indexType.flags & TypeFlags.Substitution)) {
return getIndexedAccessType(getActualTypeVariable((<IndexedAccessType>type).objectType), getActualTypeVariable((<IndexedAccessType>type).indexType));
}
return type;
}
/**
@ -14860,13 +14868,8 @@ namespace ts {
target = removeTypesFromUnionOrIntersection(<UnionOrIntersectionType>target, matchingTypes);
}
}
else if (target.flags & TypeFlags.Substitution) {
target = (target as SubstitutionType).typeVariable;
}
else if (target.flags & TypeFlags.IndexedAccess && (
(<IndexedAccessType>target).objectType.flags & TypeFlags.Substitution ||
(<IndexedAccessType>target).indexType.flags & TypeFlags.Substitution)) {
target = getIndexedAccessType(getActualTypeVariable((<IndexedAccessType>target).objectType), getActualTypeVariable((<IndexedAccessType>target).indexType));
else if (target.flags & (TypeFlags.IndexedAccess | TypeFlags.Substitution)) {
target = getActualTypeVariable(target);
}
if (target.flags & TypeFlags.TypeVariable) {
// If target is a type parameter, make an inference, unless the source type contains