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/CharacterSheet/components/ClassDetail/ClassDetail.tsx

@@ -0,0 +1,64 @@
+import React from "react";
+
+import {
+  AbilityLookup,
+  Action,
+  CharClass,
+  CharacterFeaturesManager,
+  CharacterTheme,
+  ClassFeature,
+  ClassFeatureUtils,
+  ClassUtils,
+  DataOriginRefData,
+  Feat,
+  FeatManager,
+  InfusionChoice,
+  RuleData,
+  SnippetData,
+  Spell,
+} from "@dndbeyond/character-rules-engine/es";
+
+import { ClassFeatureSnippet } from "../FeatureSnippet";
+
+interface Props {
+  charClass: CharClass;
+  onActionUseSet: (action: Action, uses: number) => void;
+  onActionClick: (action: Action) => void;
+  onSpellClick: (spell: Spell) => void;
+  onSpellUseSet: (spell: Spell, uses: number) => void;
+  onFeatureClick: (feature: ClassFeature, charClass: CharClass) => void;
+  onInfusionChoiceClick: (infusionChoice: InfusionChoice) => void;
+  feats: Array<Feat>;
+  snippetData: SnippetData;
+  ruleData: RuleData;
+  abilityLookup: AbilityLookup;
+  dataOriginRefData: DataOriginRefData;
+  isReadonly: boolean;
+  proficiencyBonus: number;
+  theme: CharacterTheme;
+  onFeatClick: (feat: FeatManager) => void;
+  featuresManager: CharacterFeaturesManager
+}
+export default class ClassDetail extends React.PureComponent<Props> {
+  render() {
+    const { charClass, ...restProps } = this.props;
+
+    return (
+      <div className="ct-class-detail">
+        <div className="ct-class-detail__name">
+          {ClassUtils.getName(charClass)} Features
+        </div>
+        <div className="ct-class-detail__features">
+          {ClassUtils.getUniqueClassFeatures(charClass).map((feature) => (
+            <ClassFeatureSnippet
+              {...restProps}
+              key={ClassFeatureUtils.getId(feature)}
+              feature={feature}
+              charClass={charClass}
+            />
+          ))}
+        </div>
+      </div>
+    );
+  }
+}

ddb_main/tools/js/CharacterSheet/components/ClassDetail/index.ts

@@ -0,0 +1,4 @@
+import ClassDetail from "./ClassDetail";
+
+export default ClassDetail;
+export { ClassDetail };