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Add createIterableType

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Jason Freeman
2015-03-24 18:29:52 -07:00
parent 4a0af76064
commit 8c2cd26103
1 changed files with 5 additions and 4 deletions
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9
src/compiler/checker.ts
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@@ -3408,6 +3408,10 @@ module ts {
return globalESSymbolConstructorSymbol || (globalESSymbolConstructorSymbol = getGlobalValueSymbol("Symbol"));
}
function createIterableType(elementType: Type): Type {
return globalIterableType !== emptyObjectType ? createTypeReference(<GenericType>globalIterableType, [elementType]) : emptyObjectType;
}
function createArrayType(elementType: Type): Type {
// globalArrayType will be undefined if we get here during creation of the Array type. This for example happens if
// user code augments the Array type with call or construct signatures that have an array type as the return type.
@@ -9268,10 +9272,7 @@ module ts {
// Now even though we have extracted the iteratedType, we will have to validate that the type
// passed in is actually an Iterable.
if (expressionForError && iteratedType) {
let completeIterableType = globalIterableType !== emptyObjectType
? createTypeReference(<GenericType>globalIterableType, [iteratedType])
: emptyObjectType;
checkTypeAssignableTo(iterable, completeIterableType, expressionForError);
checkTypeAssignableTo(iterable, createIterableType(iteratedType), expressionForError);
}
return iteratedType;