Scoped xml2js module to build folder only.

build/npm/postinstall.js

@@ -35,4 +35,6 @@ const extensions = [
 	'gulp'
 ];
 
-extensions.forEach(extension => npmInstall(`extensions/${extension}`));
\ No newline at end of file
+extensions.forEach(extension => npmInstall(`extensions/${extension}`));
+
+npmInstall(`build`); // node modules required for build
\ No newline at end of file

build/package.json

+{
+  "name": "code-oss-dev-build",
+  "version": "1.0.0",
+  "devDependencies": {
+	"@types/xml2js": "^0.0.33",
+	"xml2js": "^0.4.17"
+  }
+}
\ No newline at end of file

package.json

@@ -47,7 +47,6 @@
     "@types/semver": "^5.3.30",
     "@types/sinon": "^1.16.34",
     "@types/winreg": "^1.2.30",
-    "@types/xml2js": "^0.0.33",
     "azure-storage": "^0.3.1",
     "clean-css": "3.4.6",
     "coveralls": "^2.11.11",
@@ -106,8 +105,7 @@
     "underscore": "^1.8.2",
     "vinyl": "^0.4.5",
     "vinyl-fs": "^2.4.3",
-    "vscode-nls-dev": "^2.0.1",
-    "xml2js": "^0.4.17"
+    "vscode-nls-dev": "^2.0.1"
   },
   "repository": {
     "type": "git",