.

module/systemRegistration/migrations.mjs

@@ -0,0 +1,50 @@
+export async function runMigrations() {
+    let lastMigrationVersion = game.settings.get(CONFIG.DH.id, CONFIG.DH.SETTINGS.gameSettings.LastMigrationVersion);
+    if (!lastMigrationVersion) lastMigrationVersion = '1.0.6';
+
+    if (versionCompare(lastMigrationVersion, '1.0.7')) {
+        const compendiumActors = [];
+        for (let pack of game.packs) {
+            const documents = await pack.getDocuments();
+            compendiumActors.push(...documents.filter(x => x.type === 'character'));
+        }
+
+        [...compendiumActors, ...game.actors].forEach(actor => {
+            const items = actor.items.reduce((acc, item) => {
+                if (item.type === 'feature') {
+                    const { originItemType, isMulticlass, identifier } = item.system;
+                    const base = originItemType
+                        ? actor.items.find(
+                              x => x.type === originItemType && Boolean(isMulticlass) === Boolean(x.system.isMulticlass)
+                          )
+                        : null;
+                    if (base) {
+                        const feature = base.system.features.find(x => x.item && x.item.uuid === item.uuid);
+                        if (feature && identifier !== 'multiclass') {
+                            acc.push({ _id: item.id, system: { identifier: feature.type } });
+                        }
+                    }
+                }
+
+                return acc;
+            }, []);
+
+            actor.updateEmbeddedDocuments('Item', items);
+        });
+
+        lastMigrationVersion = '1.0.7';
+    }
+
+    await game.settings.set(CONFIG.DH.id, CONFIG.DH.SETTINGS.gameSettings.LastMigrationVersion, lastMigrationVersion);
+}
+
+const versionCompare = (current, target) => {
+    const currentSplit = current.split('.').map(x => Number.parseInt(x));
+    const targetSplit = target.split('.').map(x => Number.parseInt(x));
+    for (var i = 0; i < currentSplit.length; i++) {
+        if (currentSplit[i] < targetSplit[i]) return true;
+        if (currentSplit[i] > targetSplit[i]) return false;
+    }
+
+    return false;
+};