Add node modules and new code for release (#57)

Co-authored-by: taakleton <taakleton@users.noreply.github.com>

node_modules/underscore/modules/_has.js

@@ -0,0 +1,6 @@
+import { hasOwnProperty } from './_setup.js';
+
+// Internal function to check whether `key` is an own property name of `obj`.
+export default function has(obj, key) {
+  return obj != null && hasOwnProperty.call(obj, key);
+}