feat(customization): new customization service api (#4688)

extensions/default/src/customizations/contextMenuCustomization.ts

@@ -0,0 +1,25 @@
+import { CustomizationService } from '@ohif/core';
+
+export default {
+  'ohif.contextMenu': {
+    $transform: function (customizationService: CustomizationService) {
+      /**
+       * Applies the inheritsFrom to all the menu items.
+       * This function clones the object and child objects to prevent
+       * changes to the original customization object.
+       */
+      // Don't modify the children, as those are copied by reference
+      const clonedObject = { ...this };
+      clonedObject.menus = this.menus.map(menu => ({ ...menu }));
+
+      for (const menu of clonedObject.menus) {
+        const { items: originalItems } = menu;
+        menu.items = [];
+        for (const item of originalItems) {
+          menu.items.push(customizationService.transform(item));
+        }
+      }
+      return clonedObject;
+    },
+  },
+};