Grabbed dndbeyond's source code

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

ddb_main/node_modules/tss-react/tools/capitalize.js

@@ -0,0 +1,9 @@
+"use strict";
+Object.defineProperty(exports, "__esModule", { value: true });
+exports.capitalize = void 0;
+/** @see <https://docs.tsafe.dev/capitalize> */
+function capitalize(str) {
+    // eslint-disable-next-line @typescript-eslint/no-explicit-any
+    return (str.charAt(0).toUpperCase() + str.slice(1));
+}
+exports.capitalize = capitalize;