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/CharacterBuilder/reducers/builder.ts

@@ -0,0 +1,60 @@
+import { BuilderAction, builderActionTypes } from "../actions/builder";
+import { BuilderState } from "../typings";
+
+const initialState: BuilderState = {
+  method: null,
+  confirmSpecies: null,
+  confirmClass: null,
+  isCharacterLoading: false,
+  isCharacterLoaded: false,
+  suggestedNames: [],
+};
+function builder(
+  state: BuilderState = initialState,
+  action: BuilderAction
+): BuilderState {
+  switch (action.type) {
+    case builderActionTypes.BUILDER_METHOD_SET_COMMIT:
+      return {
+        ...state,
+        method: action.payload.method,
+      };
+
+    case builderActionTypes.CONFIRM_SPECIES_SET:
+      return {
+        ...state,
+        confirmSpecies: action.payload.race,
+      };
+
+    case builderActionTypes.CONFIRM_CLASS_SET:
+      return {
+        ...state,
+        confirmClass: action.payload.charClass,
+      };
+
+    case builderActionTypes.CHARACTER_LOADING_SET_COMMIT:
+      return {
+        ...state,
+        isCharacterLoading: action.payload.isLoading,
+      };
+
+    case builderActionTypes.CHARACTER_LOADED_SET_COMMIT:
+      return {
+        ...state,
+        isCharacterLoaded: action.payload.isLoaded,
+      };
+
+    case builderActionTypes.SUGGESTED_NAMES_SET:
+      return {
+        ...state,
+        suggestedNames: action.payload.suggestedNames,
+      };
+
+    default:
+    // not implemented
+  }
+
+  return state;
+}
+
+export default builder;