Handel export default declaration completions

Author: mhegazy

src/services/services.ts

@@ -2404,6 +2404,11 @@ module ts {
                 return undefined;
             }
 
+            // If this is the default export, get the name of the declaration if it exists
+            if (displayName === "default" && symbol.valueDeclaration && (symbol.valueDeclaration.flags & NodeFlags.Default) && symbol.valueDeclaration.localSymbol && symbol.valueDeclaration.localSymbol.name) {
+                displayName = symbol.valueDeclaration.localSymbol.name;
+            }
+
             let firstCharCode = displayName.charCodeAt(0);
             // First check of the displayName is not external module; if it is an external module, it is not valid entry
             if ((symbol.flags & SymbolFlags.Namespace) && (firstCharCode === CharacterCodes.singleQuote || firstCharCode === CharacterCodes.doubleQuote)) {
@@ -2620,7 +2625,7 @@ module ts {
                         previousToken.getStart() :
                         position;
 
-                    let scopeNode = getScopeNode(contextToken, adjustedPosition, sourceFile);
+                    let scopeNode = getScopeNode(contextToken, adjustedPosition, sourceFile) || sourceFile;
 
                     /// TODO filter meaning based on the current context
                     let symbolMeanings = SymbolFlags.Type | SymbolFlags.Value | SymbolFlags.Namespace | SymbolFlags.Alias;

tests/cases/fourslash/exportDefaultClass.ts

@@ -0,0 +1,12 @@
+/// <reference path='./fourslash.ts'/>
+
+////export default class C {
+////    method() { /*1*/ }
+////}
+//// /*2*/
+
+goTo.marker('1');
+verify.completionListContains("C", "class C", /*documentation*/ undefined, "class");
+
+goTo.marker('2');
+verify.completionListContains("C", "class C", /*documentation*/ undefined, "class");

tests/cases/fourslash/exportDefaultFunction.ts

@@ -0,0 +1,12 @@
+/// <reference path='./fourslash.ts'/>
+
+////export default function func() {
+////    /*1*/
+////}
+//// /*2*/
+
+goTo.marker('1');
+verify.completionListContains("func", "function func(): void", /*documentation*/ undefined, "function");
+
+goTo.marker('2');
+verify.completionListContains("func", "function func(): void", /*documentation*/ undefined, "function");