Merge branch 'master' into fix4686_fixrename

src/compiler/checker.ts

@@ -14306,7 +14306,7 @@ namespace ts {
                     }
                     const { declarations, flags } = exports[id];
                     // ECMA262: 15.2.1.1 It is a Syntax Error if the ExportedNames of ModuleItemList contains any duplicate entries. (TS Exceptions: namespaces, function overloads, enums, and interfaces)
-                    if (!(flags & (SymbolFlags.Namespace | SymbolFlags.Interface | SymbolFlags.Enum)) && declarations.length > 1) {
+                    if (!(flags & (SymbolFlags.Namespace | SymbolFlags.Interface | SymbolFlags.Enum)) && (flags & SymbolFlags.TypeAlias ? declarations.length - 1 : declarations.length) > 1) {
                         const exportedDeclarations: Declaration[] = filter(declarations, isNotOverload);
                         if (exportedDeclarations.length > 1) {
                             for (const declaration of exportedDeclarations) {

src/compiler/sys.ts

@@ -51,6 +51,8 @@ namespace ts {
         args: string[];
         currentDirectory: string;
         executingFile: string;
+        newLine?: string;
+        useCaseSensitiveFileNames?: boolean;
         echo(s: string): void;
         quit(exitCode?: number): void;
         fileExists(path: string): boolean;
@@ -60,6 +62,8 @@ namespace ts {
         readFile(path: string): string;
         writeFile(path: string, contents: string): void;
         readDirectory(path: string, extension?: string, exclude?: string[]): string[];
+        watchFile?(path: string, callback: (path: string, removed?: boolean) => void): FileWatcher;
+        watchDirectory?(path: string, callback: (path: string) => void, recursive?: boolean): FileWatcher;
     };
 
     export var sys: System = (function () {
@@ -469,9 +473,9 @@ namespace ts {
         function getChakraSystem(): System {
 
             return {
-                newLine: "\r\n",
+                newLine: ChakraHost.newLine || "\r\n",
                 args: ChakraHost.args,
-                useCaseSensitiveFileNames: false,
+                useCaseSensitiveFileNames: !!ChakraHost.useCaseSensitiveFileNames,
                 write: ChakraHost.echo,
                 readFile(path: string, encoding?: string) {
                     // encoding is automatically handled by the implementation in ChakraHost