push newline to compilerhost instead of using sys directelly. This allows the language service to set it, as sys is not defined in language service scenarios

src/compiler/checker.ts

@@ -2387,7 +2387,7 @@ module ts {
 
                             var errorInfo = chainDiagnosticMessages(undefined, Diagnostics.Named_properties_0_of_types_1_and_2_are_not_identical, prop.name, typeName1, typeName2);
                             errorInfo = chainDiagnosticMessages(errorInfo, Diagnostics.Interface_0_cannot_simultaneously_extend_types_1_and_2_Colon, typeToString(type), typeName1, typeName2);
-                            addDiagnostic(createDiagnosticForNodeFromMessageChain(typeNode, errorInfo));
+                            addDiagnostic(createDiagnosticForNodeFromMessageChain(typeNode, errorInfo, program.getCompilerHost().getNewLine()));
                         }
                     }
                 }
@@ -2434,7 +2434,7 @@ module ts {
                 error(errorNode, Diagnostics.Excessive_stack_depth_comparing_types_0_and_1, typeToString(source), typeToString(target));
             }
             else if (errorInfo) {
-                addDiagnostic(createDiagnosticForNodeFromMessageChain(errorNode, errorInfo));
+                addDiagnostic(createDiagnosticForNodeFromMessageChain(errorNode, errorInfo, program.getCompilerHost().getNewLine()));
             }
             return result;
 

src/compiler/core.ts

@@ -214,7 +214,7 @@ module ts {
         }
     }
 
-    export function flattenDiagnosticChain(file: SourceFile, start: number, length: number, diagnosticChain: DiagnosticMessageChain): Diagnostic {
+    export function flattenDiagnosticChain(file: SourceFile, start: number, length: number, diagnosticChain: DiagnosticMessageChain, newLine: string): Diagnostic {
         var code = diagnosticChain.code;
         var category = diagnosticChain.category;
         var messageText = "";
@@ -222,7 +222,7 @@ module ts {
         var indent = 0;
         while (diagnosticChain) {
             if (indent) {
-                messageText += sys.newLine;
+                messageText += newLine;
                 
                 for (var i = 0; i < indent; i++) {
                     messageText += "  ";

src/compiler/emitter.ts

@@ -22,6 +22,7 @@ module ts {
         var compilerOptions = program.getCompilerOptions();
         var sourceMapDataList: SourceMapData[] = compilerOptions.sourceMap ? [] : undefined;
         var diagnostics: Diagnostic[] = [];
+        var newLine = program.getCompilerHost().getNewLine();
 
         function getSourceFilePathInNewDir(newDirPath: string, sourceFile: SourceFile) {
             var sourceFilePath = getNormalizedPathFromPathCompoments(getNormalizedPathComponents(sourceFile.filename, compilerHost.getCurrentDirectory()));
@@ -126,7 +127,7 @@ module ts {
 
             function writeLine() {
                 if (!lineStart) {
-                    output += sys.newLine;
+                    output += newLine;
                     lineCount++;
                     linePos = output.length;
                     lineStart = true;
@@ -2252,7 +2253,7 @@ module ts {
                     compilerHost.getCurrentDirectory(),
                 /*isAbsolutePathAnUrl*/ false);
 
-                referencePathsOutput += "/// <reference path='" + declFileName + "' />" + sys.newLine;
+                referencePathsOutput += "/// <reference path='" + declFileName + "' />" + newLine;
             }
 
             if (root) {

src/compiler/parser.ts

@@ -88,12 +88,12 @@ module ts {
         return createFileDiagnostic(file, start, length, message, arg0, arg1, arg2);
     }
 
-    export function createDiagnosticForNodeFromMessageChain(node: Node, messageChain: DiagnosticMessageChain): Diagnostic {
+    export function createDiagnosticForNodeFromMessageChain(node: Node, messageChain: DiagnosticMessageChain, newLine: string): Diagnostic {
         node = getErrorSpanForNode(node);
         var file = getSourceFileOfNode(node);
         var start = skipTrivia(file.text, node.pos);
         var length = node.end - start;
-        return flattenDiagnosticChain(file, start, length, messageChain);
+        return flattenDiagnosticChain(file, start, length, messageChain, newLine);
     }
 
     export function getErrorSpanForNode(node: Node): Node {

src/compiler/tc.ts

@@ -162,7 +162,8 @@ module ts {
             writeFile: writeFile,
             getCurrentDirectory: () => currentDirectory || (currentDirectory = sys.getCurrentDirectory()),
             useCaseSensitiveFileNames: () => sys.useCaseSensitiveFileNames,
-            getCanonicalFileName: getCanonicalFileName
+            getCanonicalFileName: getCanonicalFileName,
+            getNewLine: () => sys.newLine
         };
     }
 

src/compiler/types.ts

@@ -1104,5 +1104,6 @@ module ts {
         getCurrentDirectory(): string;
         getCanonicalFileName(fileName: string): string;
         useCaseSensitiveFileNames(): boolean;
+        getNewLine(): string;
     }
 }