MINOR,FEAT: extended extension logic

src/extensions/extension.js

@@ -46,6 +46,13 @@ class CompelExtension {
      */
     helperFun;
 
+    /**
+     * functions that are supposed to be executed after install,
+     * to extend it that way.
+     * @type {Array<Function>}
+     */
+    funAfterInstall
+
     /**
      * defines how jpc-like-websites is to be extended and executes that extension
      */
@@ -68,5 +75,10 @@ class CompelExtension {
             }
         }
 
+        if (this.funAfterInstall) {
+            for (const fun of this.funAfterInstall) {
+                fun();
+            }
+        }
     }
 }