chore: protect against running Hermes without block scoped vars

Author: ChALkeR

bundler/modules/globals.cjs

@@ -70,6 +70,14 @@ if (!Array.prototype.at) {
 }
 
 if (process.env.EXODUS_TEST_PLATFORM === 'hermes') {
+  // Refuse to run if block scoped vars are fake
+  const r = []
+  for (let key of [1, 2]) r.push(() => key) // eslint-disable-line prefer-const
+  if (r[0]() === r[1]()) {
+    print('‼ FATAL Fake block-scoped vars support detected')
+    throw new Error('Refusing to run')
+  }
+
   // Fixed after 0.12, not present in 0.12
   // Refs: https://github.com/facebook/hermes/commit/e8fa81328dd630e39975e6d16ac3e6f47f4cba06
   if (!Promise.allSettled) {