chore(lint): Enable no-unused-expressions disabling use for webpack.

.eslintrc

@@ -215,6 +215,7 @@
     "no-unneeded-ternary": 2,
     "no-unreachable": 2,
     "no-unsafe-finally": 2,
+    "no-unused-expressions": 2,
     "no-unused-labels": 2,
     "no-unused-vars": [2, {"vars": "all", "args": "none"}],
     "no-use-before-define": 2,

lib/vendor-src.js

@@ -3,7 +3,7 @@
 // Instead, import the bundle like this:
 // require("lib/vendor.bundle");
 try {
-  platform_exports;
+  platform_exports; // eslint-disable-line no-unused-expressions
 } catch (e) {
   throw new Error("You are trying to import the wrong file. Import lib/vendor.bundle.js instead of lib/vendor-src.js");
 }