refactor(random-bytes): support environments with no crypto

Author: mbroadst

lib/parser/utils.js

@@ -12,7 +12,15 @@ function normalizedFunctionString(fn) {
 
 let randomBytes;
 if (typeof window !== 'undefined') {
-  randomBytes = size => window.crypto.getRandomValues(new Uint8Array(size));
+  if (window.crypto && window.crypto.getRandomValues) {
+    randomBytes = size => window.crypto.getRandomValues(new Uint8Array(size));
+  } else {
+    randomBytes = size => {
+      const result = new Uint8Array(size);
+      for (let i = 0; i < size; ++i) result[i] = Math.floor(Math.random() * 256);
+      return result;
+    };
+  }
 } else {
   randomBytes = require('crypto').randomBytes;
 }