Process ES6 imports when creating program

Author: ahejlsberg

Diff for: src/compiler/program.ts

@@ -274,13 +274,26 @@ module ts {
             });
         }
 
+        function getImportedModuleName(node: Node): StringLiteralExpression {
+            if (node.kind === SyntaxKind.ImportDeclaration) {
+                return (<ImportDeclaration>node).moduleSpecifier;
+            }
+            if (node.kind === SyntaxKind.ImportEqualsDeclaration) {
+                var reference = (<ImportEqualsDeclaration>node).moduleReference;
+                if (reference.kind === SyntaxKind.ExternalModuleReference) {
+                    var expr = (<ExternalModuleReference>reference).expression;
+                    if (expr && expr.kind === SyntaxKind.StringLiteral) {
+                        return <StringLiteralExpression>expr;
+                    }
+                }
+            }
+        }
+
         function processImportedModules(file: SourceFile, basePath: string) {
             forEach(file.statements, node => {
-                if (isExternalModuleImportEqualsDeclaration(node) &&
-                    getExternalModuleImportEqualsDeclarationExpression(node).kind === SyntaxKind.StringLiteral) {
-
-                    var nameLiteral = <LiteralExpression>getExternalModuleImportEqualsDeclarationExpression(node);
-                    var moduleName = nameLiteral.text;
+                if (node.kind === SyntaxKind.ImportDeclaration || node.kind === SyntaxKind.ImportEqualsDeclaration) {
+                    var nameLiteral = getImportedModuleName(node);
+                    var moduleName = nameLiteral && nameLiteral.text;
                     if (moduleName) {
                         var searchPath = basePath;
                         while (true) {