Grabbed dndbeyond's source code

```
~/go/bin/sourcemapper -output ddb -jsurl https://media.dndbeyond.com/character-app/static/js/main.90aa78c5.js
```

ddb_main/packages/rules-engine/es/engine/Infusion/utils.js

@@ -0,0 +1,26 @@
+import { ItemAccessors } from '../Item';
+import { getItemRuleData } from './accessors';
+import { hack__itemCanBeAddedToInventory } from './hacks';
+import { validateItemByInfusionRules } from './validators';
+/**
+ *
+ * @param items
+ * @param infusion
+ * @param itemId
+ * @param itemCanBeAddedLookup
+ */
+export function filterAvailableItems(items, infusion, itemId = null, itemCanBeAddedLookup = {}) {
+    if (itemId !== null && !hack__itemCanBeAddedToInventory(infusion, itemId, itemCanBeAddedLookup)) {
+        return items.filter((item) => itemId === ItemAccessors.getGroupedId(item));
+    }
+    const itemRuleData = getItemRuleData(infusion);
+    if (itemRuleData === null) {
+        return [];
+    }
+    let availableItems = [];
+    const andRules = itemRuleData.itemRules !== null ? itemRuleData.itemRules : [];
+    if (andRules.length) {
+        availableItems = items.filter((item) => validateItemByInfusionRules(item, andRules));
+    }
+    return availableItems;
+}