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Check if binding element already has been assigned a contextual type

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This commit is contained in:
Anders Hejlsberg
2015-09-23 14:45:09 -07:00
parent 5a77d67b63
commit a292da593b
1 changed files with 8 additions and 1 deletions
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9
src/compiler/checker.ts
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@@ -2293,10 +2293,17 @@ namespace ts {
return type && (type.flags & TypeFlags.Any) !== 0;
}
// Return the type of a binding element parent. We check SymbolLinks first to see if a type has been
// assigned by contextual typing.
function getTypeForBindingElementParent(node: VariableLikeDeclaration) {
let symbol = getSymbolOfNode(node);
return symbol && getSymbolLinks(symbol).type || getTypeForVariableLikeDeclaration(node);
}
// Return the inferred type for a binding element
function getTypeForBindingElement(declaration: BindingElement): Type {
let pattern = <BindingPattern>declaration.parent;
let parentType = getTypeForVariableLikeDeclaration(<VariableLikeDeclaration>pattern.parent);
let parentType = getTypeForBindingElementParent(<VariableLikeDeclaration>pattern.parent);
// If parent has the unknown (error) type, then so does this binding element
if (parentType === unknownType) {
return unknownType;