diff --git a/src/harness/harnessLanguageService.ts b/src/harness/harnessLanguageService.ts
index 5e8d6e76716e8..58df0d9a5e207 100644
--- a/src/harness/harnessLanguageService.ts
+++ b/src/harness/harnessLanguageService.ts
@@ -686,7 +686,7 @@ namespace Harness.LanguageService {
             this.host.log(message);
         }
 
-        err(message: string): void {
+        msg(message: string): void {
             this.host.log(message);
         }
 
@@ -702,7 +702,8 @@ namespace Harness.LanguageService {
             return false;
         }
 
-        group() { throw ts.notImplemented(); }
+        startGroup() { throw ts.notImplemented(); }
+        endGroup() { throw ts.notImplemented(); }
 
         perftrc(message: string): void {
             return this.host.log(message);
diff --git a/src/harness/unittests/tsserverProjectSystem.ts b/src/harness/unittests/tsserverProjectSystem.ts
index 596e080430ca9..6e548231c9140 100644
--- a/src/harness/unittests/tsserverProjectSystem.ts
+++ b/src/harness/unittests/tsserverProjectSystem.ts
@@ -39,8 +39,9 @@ namespace ts.projectSystem {
         loggingEnabled: () => false,
         perftrc: noop,
         info: noop,
-        err: noop,
-        group: noop,
+        msg: noop,
+        startGroup: noop,
+        endGroup: noop,
         getLogFileName: (): string => undefined
     };
 
diff --git a/src/server/editorServices.ts b/src/server/editorServices.ts
index fe7946fc0f7cc..cb497ff774f1c 100644
--- a/src/server/editorServices.ts
+++ b/src/server/editorServices.ts
@@ -958,28 +958,28 @@ namespace ts.server {
                 return;
             }
 
-            this.logger.group(info => {
-                let counter = 0;
-                counter = printProjects(this.externalProjects, info, counter);
-                counter = printProjects(this.configuredProjects, info, counter);
-                printProjects(this.inferredProjects, info, counter);
-
-                info("Open files: ");
-                for (const rootFile of this.openFiles) {
-                    info(`\t${rootFile.fileName}`);
-                }
-            });
-
-            function printProjects(projects: Project[], info: (msg: string) => void, counter: number): number {
+            this.logger.startGroup();
+            let counter = 0;
+            const printProjects = (projects: Project[], counter: number): number => {
                 for (const project of projects) {
                     project.updateGraph();
-                    info(`Project '${project.getProjectName()}' (${ProjectKind[project.projectKind]}) ${counter}`);
-                    info(project.filesToString());
-                    info("-----------------------------------------------");
+                    this.logger.info(`Project '${project.getProjectName()}' (${ProjectKind[project.projectKind]}) ${counter}`);
+                    this.logger.info(project.filesToString());
+                    this.logger.info("-----------------------------------------------");
                     counter++;
                 }
                 return counter;
+            };
+            counter = printProjects(this.externalProjects, counter);
+            counter = printProjects(this.configuredProjects, counter);
+            printProjects(this.inferredProjects, counter);
+
+            this.logger.info("Open files: ");
+            for (const rootFile of this.openFiles) {
+                this.logger.info(`\t${rootFile.fileName}`);
             }
+
+            this.logger.endGroup();
         }
 
         private findConfiguredProjectByProjectName(configFileName: NormalizedPath) {
diff --git a/src/server/server.ts b/src/server/server.ts
index 66467fd46ae32..0fe37dd8ba0d5 100644
--- a/src/server/server.ts
+++ b/src/server/server.ts
@@ -140,6 +140,8 @@ namespace ts.server {
     class Logger implements server.Logger {
         private fd = -1;
         private seq = 0;
+        private inGroup = false;
+        private firstInGroup = true;
 
         constructor(private readonly logFilename: string,
             private readonly traceToConsole: boolean,
@@ -169,24 +171,24 @@ namespace ts.server {
         }
 
         perftrc(s: string) {
-            this.msg(s, "Perf");
+            this.msg(s, Msg.Perf);
         }
 
         info(s: string) {
-            this.msg(s, "Info");
+            this.msg(s, Msg.Info);
         }
 
         err(s: string) {
-            this.msg(s, "Err");
+            this.msg(s, Msg.Err);
         }
 
-        group(logGroupEntries: (log: (msg: string) => void) => void) {
-            let firstInGroup = false;
-            logGroupEntries(s => {
-                this.msg(s, "Info", /*inGroup*/ true, firstInGroup);
-                firstInGroup = false;
-            });
-            this.seq++;
+        startGroup() {
+            this.inGroup = true;
+            this.firstInGroup = true;
+        }
+
+        endGroup() {
+            this.inGroup = false;
         }
 
         loggingEnabled() {
@@ -197,16 +199,16 @@ namespace ts.server {
             return this.loggingEnabled() && this.level >= level;
         }
 
-        private msg(s: string, type: string, inGroup = false, firstInGroup = false) {
+        msg(s: string, type: Msg.Types = Msg.Err) {
             if (!this.canWrite) return;
 
             s = `[${nowString()}] ${s}\n`;
-            if (!inGroup || firstInGroup) {
+            if (!this.inGroup || this.firstInGroup) {
                 const prefix = Logger.padStringRight(type + " " + this.seq.toString(), "          ");
                 s = prefix + s;
             }
             this.write(s);
-            if (!inGroup) {
+            if (!this.inGroup) {
                 this.seq++;
             }
         }
diff --git a/src/server/session.ts b/src/server/session.ts
index 92d402b343a53..9556028d05a17 100644
--- a/src/server/session.ts
+++ b/src/server/session.ts
@@ -368,7 +368,7 @@ namespace ts.server {
                     msg += "\n" + (<StackTraceError>err).stack;
                 }
             }
-            this.logger.err(msg);
+            this.logger.msg(msg, Msg.Err);
         }
 
         public send(msg: protocol.Message) {
@@ -1950,7 +1950,7 @@ namespace ts.server {
                 return this.executeWithRequestId(request.seq, () => handler(request));
             }
             else {
-                this.logger.err(`Unrecognized JSON command: ${JSON.stringify(request)}`);
+                this.logger.msg(`Unrecognized JSON command: ${JSON.stringify(request)}`, Msg.Err);
                 this.output(undefined, CommandNames.Unknown, request.seq, `Unrecognized JSON command: ${request.command}`);
                 return { responseRequired: false };
             }
diff --git a/src/server/utilities.ts b/src/server/utilities.ts
index 0d4bc101ff63a..e2e2a67eaf12d 100644
--- a/src/server/utilities.ts
+++ b/src/server/utilities.ts
@@ -17,11 +17,22 @@ namespace ts.server {
         loggingEnabled(): boolean;
         perftrc(s: string): void;
         info(s: string): void;
-        err(s: string): void;
-        group(logGroupEntries: (log: (msg: string) => void) => void): void;
+        startGroup(): void;
+        endGroup(): void;
+        msg(s: string, type?: Msg.Types): void;
         getLogFileName(): string;
     }
 
+    export namespace Msg {
+        export type Err = "Err";
+        export const Err: Err = "Err";
+        export type Info = "Info";
+        export const Info: Info = "Info";
+        export type Perf = "Perf";
+        export const Perf: Perf = "Perf";
+        export type Types = Err | Info | Perf;
+    }
+
     function getProjectRootPath(project: Project): Path {
         switch (project.projectKind) {
             case ProjectKind.Configured:
@@ -115,9 +126,7 @@ namespace ts.server {
     }
 
     export function createNormalizedPathMap<T>(): NormalizedPathMap<T> {
-/* tslint:disable:no-null-keyword */
         const map = createMap<T>();
-/* tslint:enable:no-null-keyword */
         return {
             get(path) {
                 return map.get(path);