first commit

module/helpers/item-helpers.js

@@ -0,0 +1,35 @@
+export default class ItemHelpers {
+    static async itemUpdate(event, formData) {
+        formData = expandObject(formData);
+
+        if (this.object.isOwned && this.object.actor?.compendium?.metadata) {
+            return;
+        }
+
+        // Handle the free-form modifications list
+        const formAttrs = expandObject(formData)?.data?.modifications || {};
+
+        const modifications = Object.values(formAttrs).reduce((obj, v) => {
+            let k = v["key"].trim();
+            delete v["key"];
+            obj[k] = v;
+            return obj;
+        }, {});
+
+        // Remove modifications which are no longer used
+        if (this.object.data?.data?.modifications) {
+            for (let k of Object.keys(this.object.data.data.modifications)) {
+                if (!modifications.hasOwnProperty(k)) modifications[`-=${k}`] = null;
+            }
+        }
+
+        // recombine modifications to formData
+        if (Object.keys(modifications).length > 0) {
+            setProperty(formData, `data.modifications`, modifications);
+        }
+
+        // Update the Item
+        this.item.data.flags.loaded = false;
+        this.object.update(formData);
+    }
+}