Add time stamp into the ti log.

src/server/server.ts

@@ -211,12 +211,6 @@ namespace ts.server {
         }
     }
 
-    // E.g. "12:34:56.789"
-    function nowString() {
-        const d = new Date();
-        return `${d.getHours()}:${d.getMinutes()}:${d.getSeconds()}.${d.getMilliseconds()}`;
-    }
-
     interface QueuedOperation {
         operationId: string;
         operation: () => void;

src/server/shared.ts

@@ -33,4 +33,11 @@ namespace ts.server {
             ? sys.args[index + 1]
             : undefined;
     }
-}
+
+    /*@internal*/
+    export function nowString() {
+        // E.g. "12:34:56.789"
+        const d = new Date();
+        return `${d.getHours()}:${d.getMinutes()}:${d.getSeconds()}.${d.getMilliseconds()}`;
+    }
+}

src/server/typingsInstaller/nodeTypingsInstaller.ts

@@ -21,7 +21,7 @@ namespace ts.server.typingsInstaller {
         }
         writeLine = (text: string) => {
             try {
-                fs.appendFileSync(this.logFile, text + sys.newLine);
+                fs.appendFileSync(this.logFile, `[${nowString()}] ${text}${sys.newLine}`);
             }
             catch (e) {
                 this.logEnabled = false;