Fix get type from short-hand property assignment

Author: Yui T

src/compiler/checker.ts

@@ -1665,6 +1665,13 @@ module ts {
                 }
                 return type;
             }
+
+            // If it is a short-hand property assignment; Use the type of the identifier
+            if (declaration.kind === SyntaxKind.ShortHandPropertyAssignment) {
+                var type = checkIdentifier(<Identifier>(declaration.name));
+                return type
+            }
+
             // Rest parameters default to type any[], other parameters default to type any
             var type = declaration.flags & NodeFlags.Rest ? createArrayType(anyType) : anyType;
             checkImplicitAny(type);

src/compiler/parser.ts

@@ -574,6 +574,7 @@ module ts {
             case SyntaxKind.VariableDeclaration:
             case SyntaxKind.Property:
             case SyntaxKind.PropertyAssignment:
+            case SyntaxKind.ShortHandPropertyAssignment:
             case SyntaxKind.EnumMember:
             case SyntaxKind.Method:
             case SyntaxKind.FunctionDeclaration:

src/services/services.ts

@@ -1969,7 +1969,7 @@ module ts {
     /** Returns true if node is a name of an object literal property, e.g. "a" in x = { "a": 1 } */
     function isNameOfPropertyAssignment(node: Node): boolean {
         return (node.kind === SyntaxKind.Identifier || node.kind === SyntaxKind.StringLiteral || node.kind === SyntaxKind.NumericLiteral) &&
-            node.parent.kind === SyntaxKind.PropertyAssignment && (<PropertyDeclaration>node.parent).name === node;
+            (node.parent.kind === SyntaxKind.PropertyAssignment || node.parent.kind === SyntaxKind.ShortHandPropertyAssignment) && (<PropertyDeclaration>node.parent).name === node;
     }
 
     function isLiteralNameOfPropertyDeclarationOrIndexAccess(node: Node): boolean {
@@ -2648,7 +2648,7 @@ module ts {
 
                 var existingMemberNames: Map<boolean> = {};
                 forEach(existingMembers, m => {
-                    if (m.kind !== SyntaxKind.PropertyAssignment) {
+                    if (m.kind !== SyntaxKind.PropertyAssignment && m.kind !== SyntaxKind.ShortHandPropertyAssignment) {
                         // Ignore omitted expressions for missing members in the object literal
                         return;
                     }
@@ -4569,6 +4569,7 @@ module ts {
                 case SyntaxKind.VariableDeclaration:
                 case SyntaxKind.Property:
                 case SyntaxKind.PropertyAssignment:
+                case SyntaxKind.ShortHandPropertyAssignment:
                 case SyntaxKind.EnumMember:
                 case SyntaxKind.Method:
                 case SyntaxKind.Constructor: