New source found from dndbeyond.com

ddb_main/packages/rules-engine/es/engine/Feat/accessors.js

@@ -281,3 +281,7 @@ export function getDefinitionRepeatableParentId(feat) {
 export function getRepeatableParentId(feat) {
     return getDefinitionRepeatableParentId(feat);
 }
+export function getSpellListIds(feat) {
+    var _a, _b;
+    return (_b = (_a = getDefinition(feat)) === null || _a === void 0 ? void 0 : _a.spellListIds) !== null && _b !== void 0 ? _b : [];
+}

ddb_main/packages/rules-engine/es/engine/Feat/generators.js

@@ -14,7 +14,7 @@ import { ModifierGenerators } from '../Modifier';
 import { OptionAccessors, OptionGenerators } from '../Option';
 import { RaceAccessors } from '../Race';
 import { SpellGenerators } from '../Spell';
-import { getComponentId, getComponentTypeId, getCreatureRules, getEntityTypeId, getId, getModifiers, getOptions, getUniqueKey, } from './accessors';
+import { getComponentId, getComponentTypeId, getCreatureRules, getEntityTypeId, getId, getModifiers, getOptions, getSpellListIds, getUniqueKey, } from './accessors';
 /**
  *
  * @param feat
@@ -342,3 +342,20 @@ export function generateDataOriginPairedFeats(feats) {
     }
     return lookup;
 }
+/**
+ * Generates a list of spell list IDs from the feats.
+ * This is used to determine which spell lists are available globally.
+ *
+ * @param feats - Array of Feat objects
+ * @returns Array of spell list IDs
+ */
+export function generateGlobalFeatsSpellListIds(feats) {
+    const spellListIds = [];
+    feats.forEach((feat) => {
+        const spellListIdsForFeat = getSpellListIds(feat);
+        if (spellListIdsForFeat.length > 0) {
+            spellListIds.push(...spellListIdsForFeat);
+        }
+    });
+    return spellListIds;
+}