MINOR,IMPRO,FIX,REFA: changed to map approach

src/base/extStore.js

@@ -522,12 +522,13 @@ class SStoreDefinition {
  */
 function resolveOverwrite(key, container, overwriteBehaviour) {
     let dealAsMap = container instanceof Map;
-    let occurances = (dealAsMap
-        ? container.keys
+    let occurances = [...(
+        dealAsMap
+            ? container.keys()
             : Object.keys(container)
     )
-        .filter(e => e.includes(key))
-        .length;
+        .filter(e => e.includes(key)
+        )].length;
 
     switch (overwriteBehaviour) {
         case OverwriteBehaviour.REPLACE:

src/context/scriptAndStyleContext.js

@@ -50,8 +50,7 @@ class ScriptAndStyleContext {
         ].find(e => e !== '');
 
         /* deal with name already present */
-        let functionNames = this.#functions.keys;
-        if (functionNames.includes(registrationName)) {
+        if (this.#functions.has(registrationName)) {
             registrationName = resolveOverwrite(registrationName, this.#functions, overwriteBehaviour);
         }