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Remove unnecessary caching of substitution types

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This commit is contained in:
Anders Hejlsberg 2018-01-21 08:03:30 -08:00
parent f19959afd4
commit b8692901f2
1 changed files with 0 additions and 7 deletions
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7
src/compiler/checker.ts
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@ -303,7 +303,6 @@ namespace ts {
const literalTypes = createMap<LiteralType>();
const indexedAccessTypes = createMap<IndexedAccessType>();
const conditionalTypes = createMap<ConditionalType>();
const substitutionTypes = createMap<SubstitutionType>();
const evolvingArrayTypes: EvolvingArrayType[] = [];
const undefinedProperties = createMap<Symbol>() as UnderscoreEscapedMap<Symbol>;
@ -7156,15 +7155,9 @@ namespace ts {
}
function getSubstitutionType(typeParameter: TypeParameter, substitute: Type) {
const id = typeParameter.id + "," + substitute.id;
const cached = substitutionTypes.get(id);
if (cached) {
return cached;
}
const result = <SubstitutionType>createType(TypeFlags.Substitution);
result.typeParameter = typeParameter;
result.substitute = substitute;
substitutionTypes.set(id, result);
return result;
}