added completion for exports in named imports section

src/compiler/checker.ts

@@ -56,6 +56,7 @@ module ts {
             isImplementationOfOverload,
             getAliasedSymbol: resolveImport,
             getEmitResolver,
+            getExportsOfExternalModule,
         };
 
         var undefinedSymbol = createSymbol(SymbolFlags.Property | SymbolFlags.Transient, "undefined");
@@ -2754,6 +2755,19 @@ module ts {
             return result;
         }
 
+        function getExportsOfExternalModule(node: ImportDeclaration): Symbol[]{
+            if (!node.moduleSpecifier) {
+                return emptyArray;
+            }
+
+            var module = resolveExternalModuleName(node, node.moduleSpecifier);
+            if (!module || !module.exports) {
+                return emptyArray;
+            }
+
+            return mapToArray(module.exports)
+        }
+
         function getSignatureFromDeclaration(declaration: SignatureDeclaration): Signature {
             var links = getNodeLinks(declaration);
             if (!links.resolvedSignature) {

src/compiler/types.ts

@@ -1100,6 +1100,7 @@ module ts {
         getConstantValue(node: EnumMember | PropertyAccessExpression | ElementAccessExpression): number;
         isValidPropertyAccess(node: PropertyAccessExpression | QualifiedName, propertyName: string): boolean;
         getAliasedSymbol(symbol: Symbol): Symbol;
+        getExportsOfExternalModule(node: ImportDeclaration): Symbol[];
 
         // Should not be called directly.  Should only be accessed through the Program instance.
         /* @internal */ getDiagnostics(sourceFile?: SourceFile): Diagnostic[];

src/services/services.ts

@@ -2403,6 +2403,19 @@ module ts {
                         getCompletionEntriesFromSymbols(filteredMembers, activeCompletionSession);
                     }
                 }
+                else if (getAncestor(previousToken, SyntaxKind.ImportClause)) {
+                    // cursor is in import clause
+                    // try to show exported member for imported module
+                    isMemberCompletion = true;
+                    isNewIdentifierLocation = true;
+                    if (canShowCompletionInImportsClause(previousToken)) {
+                        var importDeclaration = <ImportDeclaration>getAncestor(previousToken, SyntaxKind.ImportDeclaration);
+                        Debug.assert(importDeclaration !== undefined);
+                        var exports = typeInfoResolver.getExportsOfExternalModule(importDeclaration);
+                        var filteredExports = filterModuleExports(exports, importDeclaration);
+                        getCompletionEntriesFromSymbols(filteredExports, activeCompletionSession);
+                    }
+                }
                 else {
                     // Get scope members
                     isMemberCompletion = false;
@@ -2453,6 +2466,16 @@ module ts {
                 return result;
             }
 
+            function canShowCompletionInImportsClause(node: Node): boolean {
+                // import {| 
+                // import {a,|
+                if (node.kind === SyntaxKind.OpenBraceToken || node.kind === SyntaxKind.CommaToken) {
+                    return node.parent.kind === SyntaxKind.NamedImports;
+                }
+
+                return false;
+            }
+
             function isNewIdentifierDefinitionLocation(previousToken: Node): boolean {
                 if (previousToken) {
                     var containingNodeKind = previousToken.parent.kind;
@@ -2531,6 +2554,8 @@ module ts {
                 return false;
             }
 
+
+
             function getContainingObjectLiteralApplicableForCompletion(previousToken: Node): ObjectLiteralExpression {
                 // The locations in an object literal expression that are applicable for completion are property name definition locations.
 
@@ -2664,6 +2689,34 @@ module ts {
                 return false;
             }
 
+            function filterModuleExports(exports: Symbol[], importDeclaration: ImportDeclaration): Symbol[]{
+                var exisingImports: Map<boolean> = {};
+
+                if (!importDeclaration.importClause) {
+                    return exports;
+                }
+
+                if (importDeclaration.importClause.name) {
+                    exisingImports[importDeclaration.importClause.name.text] = true;
+                }
+
+                if (importDeclaration.importClause.namedBindings &&
+                    importDeclaration.importClause.namedBindings.kind === SyntaxKind.NamedImports) {
+
+                    forEach((<NamedImports>importDeclaration.importClause.namedBindings).elements, el => {
+                        var name = el.propertyName || el.name;
+                        exisingImports[name.text] = true;
+                    });
+                }
+
+                if (isEmpty(exisingImports)) {
+                    return exports;
+                }
+                else {
+                    return filter(exports, e => !lookUp(exisingImports, e.name));
+                }
+            }
+
             function filterContextualMembersList(contextualMemberSymbols: Symbol[], existingMembers: Declaration[]): Symbol[] {
                 if (!existingMembers || existingMembers.length === 0) {
                     return contextualMemberSymbols;