Grabbed dndbeyond's source code

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

ddb_main/tools/js/Shared/containers/panes/SpellManagePane/SpellManagePane.tsx

@@ -0,0 +1,51 @@
+import { useSelector } from "react-redux";
+
+import {
+  ClassUtils,
+  rulesEngineSelectors,
+} from "@dndbeyond/character-rules-engine/es";
+
+import SpellSlotManager from "../../../../CharacterSheet/containers/SpellSlotManager";
+import ClassSpellManager from "../../../components/ClassSpellManager";
+
+export default function SpellManagePane() {
+  const classSpellLists = useSelector(rulesEngineSelectors.getClassSpellLists);
+  const entityValueLookup = useSelector(
+    rulesEngineSelectors.getCharacterValueLookupByEntity
+  );
+  const dataOriginRefData = useSelector(
+    rulesEngineSelectors.getDataOriginRefData
+  );
+  const proficiencyBonus = useSelector(
+    rulesEngineSelectors.getProficiencyBonus
+  );
+  const theme = useSelector(rulesEngineSelectors.getCharacterTheme);
+
+  if (!classSpellLists.length) {
+    return (
+      <div className="ct-spell-manage-pane__default">
+        You do not have spellcasting or pact magic spells to manage. The spells
+        that appear for your character were gained through other class features,
+        species traits, feats, or items.
+      </div>
+    );
+  }
+
+  return (
+    <div className="ct-spell-manage-pane">
+      <SpellSlotManager />
+      {classSpellLists.map((classSpellList) => (
+        <ClassSpellManager
+          {...classSpellList}
+          key={ClassUtils.getMappingId(classSpellList.charClass)}
+          hasMultipleSpellClasses={classSpellLists.length > 1}
+          entityValueLookup={entityValueLookup}
+          dataOriginRefData={dataOriginRefData}
+          isPrepareMaxed={!!classSpellList.isPrepareMaxed}
+          proficiencyBonus={proficiencyBonus}
+          theme={theme}
+        />
+      ))}
+    </div>
+  );
+}

ddb_main/tools/js/Shared/containers/panes/SpellManagePane/index.ts

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+import SpellManagePane from "./SpellManagePane";
+
+export default SpellManagePane;
+export { SpellManagePane };