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/@serprex/react-motion/lib/spring.js

@@ -0,0 +1,20 @@
+"use strict";
+
+exports.__esModule = true;
+exports["default"] = spring;
+
+var _presets = _interopRequireDefault(require("./presets"));
+
+function _interopRequireDefault(obj) { return obj && obj.__esModule ? obj : { "default": obj }; }
+
+function _extends() { _extends = Object.assign || function (target) { for (var i = 1; i < arguments.length; i++) { var source = arguments[i]; for (var key in source) { if (Object.prototype.hasOwnProperty.call(source, key)) { target[key] = source[key]; } } } return target; }; return _extends.apply(this, arguments); }
+
+var defaultConfig = _extends({}, _presets["default"].noWobble, {
+  precision: 0.01
+});
+
+function spring(val, config) {
+  return _extends({}, defaultConfig, config, {
+    val: val
+  });
+}