Merge pull request #4308 from Microsoft/adjustNodeCheck

adjust check for node env to handle webpack\browserify

package.json

@@ -43,5 +43,11 @@
         "build:compiler": "jake local",
         "build:tests": "jake tests",
         "clean": "jake clean"
-    }
+    },
+    "browser": {
+        "buffer": false,
+        "fs": false,
+        "os": false,
+        "path": false
+    }    
 }

src/compiler/sys.ts

@@ -334,7 +334,9 @@ namespace ts {
         if (typeof WScript !== "undefined" && typeof ActiveXObject === "function") {
             return getWScriptSystem();
         }
-        else if (typeof module !== "undefined" && module.exports) {
+        else if (typeof process !== "undefined" && process.nextTick && !process.browser) {
+            // process and process.nextTick checks if current environment is node-like
+            // process.browser check excludes webpack and browserify
             return getNodeSystem();
         }
         else {