sandbox - add rules for new electron-sandbox layer

build/lib/layersChecker.js

@@ -130,6 +130,14 @@ const RULES = [
             'lib.dom.d.ts' // no DOM
         ]
     },
+    // Electron (sandbox)
+    {
+        target: '**/vs/**/electron-sandbox/**',
+        allowedTypes: CORE_TYPES,
+        disallowedDefinitions: [
+            '@types/node' // no node.js
+        ]
+    },
     // Electron (renderer): skip
     {
         target: '**/vs/**/electron-browser/**',