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Handle const binding elements with initializers correctly

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This commit is contained in:
Anders Hejlsberg 2016-09-11 10:19:52 -07:00
parent a28c7034f5
commit 2344a80e6f
1 changed files with 2 additions and 1 deletions
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3
src/compiler/checker.ts
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@ -3117,7 +3117,8 @@ namespace ts {
// pattern. Otherwise, it is the type any.
function getTypeFromBindingElement(element: BindingElement, includePatternInType?: boolean, reportErrors?: boolean): Type {
if (element.initializer) {
return getBaseTypeOfLiteralType(checkExpressionCached(element.initializer));
const exprType = checkExpressionCached(element.initializer);
return getCombinedNodeFlags(element) & NodeFlags.Const ? exprType : getBaseTypeOfLiteralType(exprType);
}
if (isBindingPattern(element.name)) {
return getTypeFromBindingPattern(<BindingPattern>element.name, includePatternInType, reportErrors);