replace for of with forEach

lib/util/Components.js

@@ -256,27 +256,26 @@ function getWrapperFunctions(context, pragma) {
 function mergeRules(rules) {
   /** @type {Map<string, Function[]>} */
   const handlersByKey = new Map();
-  for (const rule of rules) {
-    for (const key of Object.keys(rule)) {
+  rules.forEach((rule) => {
+    Object.keys(rule).forEach((key) => {
       const fns = handlersByKey.get(key);
       if (!fns) {
         handlersByKey.set(key, [rule[key]]);
       } else {
         fns.push(rule[key]);
       }
-    }
-  }
+    });
+  });
 
   /** @type {{[key: string]: Function}} */
   const rule = {};
-  for (const key of handlersByKey.keys()) {
-    const fns = handlersByKey.get(key);
+  handlersByKey.forEach((fns, key) => {
     rule[key] = function mergedHandler(node) {
-      for (const fn of fns) {
+      fns.forEach((fn) => {
         fn(node);
-      }
+      });
     };
-  }
+  });
 
   return rule;
 }