Merge pull request #3724 from Microsoft/apparentTypeOfContextualType

Always get the apparent type when retrieving a contextual type

src/compiler/checker.ts

@@ -6442,6 +6442,11 @@ namespace ts {
         // Return the contextual type for a given expression node. During overload resolution, a contextual type may temporarily
         // be "pushed" onto a node using the contextualType property.
         function getContextualType(node: Expression): Type {
+            let type = getContextualTypeWorker(node);
+            return type && getApparentType(type);
+        }
+
+        function getContextualTypeWorker(node: Expression): Type {
             if (isInsideWithStatementBody(node)) {
                 // We cannot answer semantic questions within a with block, do not proceed any further
                 return undefined;