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/simple-swizzle/index.js

@@ -0,0 +1,29 @@
+'use strict';
+
+var isArrayish = require('is-arrayish');
+
+var concat = Array.prototype.concat;
+var slice = Array.prototype.slice;
+
+var swizzle = module.exports = function swizzle(args) {
+	var results = [];
+
+	for (var i = 0, len = args.length; i < len; i++) {
+		var arg = args[i];
+
+		if (isArrayish(arg)) {
+			// http://jsperf.com/javascript-array-concat-vs-push/98
+			results = concat.call(results, slice.call(arg));
+		} else {
+			results.push(arg);
+		}
+	}
+
+	return results;
+};
+
+swizzle.wrap = function (fn) {
+	return function () {
+		return fn(swizzle(arguments));
+	};
+};

ddb_main/node_modules/simple-swizzle/node_modules/is-arrayish/index.js

@@ -0,0 +1,9 @@
+module.exports = function isArrayish(obj) {
+	if (!obj || typeof obj === 'string') {
+		return false;
+	}
+
+	return obj instanceof Array || Array.isArray(obj) ||
+		(obj.length >= 0 && (obj.splice instanceof Function ||
+			(Object.getOwnPropertyDescriptor(obj, (obj.length - 1)) && obj.constructor.name !== 'String')));
+};