Update scripts

scripts/utils/unpkg.js

@@ -0,0 +1,22 @@
+const fetch = require('isomorphic-fetch');
+
+function getMetadata(packageName, version) {
+  return fetch(`https://unpkg.com/${packageName}@${version}/?meta`, {
+    method: 'GET'
+  }).then(res => res.json());
+}
+
+function collectFiles(directory) {
+  return directory.files.reduce((memo, file) => {
+    return memo.concat(file.type === 'directory' ? collectFiles(file) : file);
+  }, []);
+}
+
+function getFiles(packageName, version) {
+  return getMetadata(packageName, version).then(collectFiles);
+}
+
+module.exports = {
+  getMetadata,
+  getFiles
+};