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/derivers.js

@@ -0,0 +1,42 @@
+import { getModifierData, getModifierDataType, getModifierGroupId, getType } from './accessors';
+import { InfusionModifierDataTypeEnum, InfusionTypeEnum } from './constants';
+/**
+ * TODO this needs to consider item information for knownInfusions to be true.
+ * see hack__requiresItemChoice() for more info
+ *
+ * @param infusion
+ */
+export function deriveRequiresItemChoice(infusion) {
+    return getType(infusion) !== InfusionTypeEnum.REPLICATE;
+}
+/**
+ *
+ * @param infusion
+ */
+export function deriveRequiresModifierDataChoice(infusion) {
+    const modifierDataType = getModifierDataType(infusion);
+    if (modifierDataType === null || modifierDataType === InfusionModifierDataTypeEnum.GRANTED) {
+        return false;
+    }
+    return true;
+}
+/**
+ *
+ * @param infusion
+ */
+export function deriveSelectedModifierData(infusion) {
+    const modifierGroupId = getModifierGroupId(infusion);
+    const modifierData = getModifierData(infusion);
+    const modifierDataType = getModifierDataType(infusion);
+    switch (modifierDataType) {
+        case InfusionModifierDataTypeEnum.GRANTED:
+            return modifierData[0];
+        case InfusionModifierDataTypeEnum.CLASS_LEVEL:
+        case InfusionModifierDataTypeEnum.DAMAGE_TYPE_CHOICE:
+            const foundModifierGroup = modifierData.find((dataItem) => dataItem.id === modifierGroupId);
+            return foundModifierGroup ? foundModifierGroup : null;
+        default:
+        // not implemented
+    }
+    return null;
+}