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Merge pull request #5920 from Microsoft/fixUnionTypeInference

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Fix slowdown in type inference involving union types
This commit is contained in:
Anders Hejlsberg
2015-12-03 17:11:08 -08:00
parent 0ab538f5d0 c839dd3e9f
commit ee9c4dcafa
1 changed files with 6 additions and 3 deletions
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9
src/compiler/checker.ts
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@@ -6178,9 +6178,12 @@ namespace ts {
}
else {
source = getApparentType(source);
if (source.flags & TypeFlags.ObjectType && (target.flags & (TypeFlags.Reference | TypeFlags.Tuple) ||
(target.flags & TypeFlags.Anonymous) && target.symbol && target.symbol.flags & (SymbolFlags.Method | SymbolFlags.TypeLiteral | SymbolFlags.Class))) {
// If source is an object type, and target is a type reference, a tuple type, the type of a method, or a type literal, infer from members
if (source.flags & TypeFlags.ObjectType && (
target.flags & TypeFlags.Reference && (<TypeReference>target).typeArguments ||
target.flags & TypeFlags.Tuple ||
target.flags & TypeFlags.Anonymous && target.symbol && target.symbol.flags & (SymbolFlags.Method | SymbolFlags.TypeLiteral | SymbolFlags.Class))) {
// If source is an object type, and target is a type reference with type arguments, a tuple type,
// the type of a method, or a type literal, infer from members
if (isInProcess(source, target)) {
return;
}