generate new test that did already exist & update all module snippets with declaration

test/zip/zip.js

@@ -1,4 +1,4 @@
-module.exports = (...arrays) => {
+module.exports = zip = (...arrays) => {
 const maxLength = Math.max(...arrays.map(x => x.length));
 return Array.from({ length: maxLength }).map((_, i) => {
 return Array.from({ length: arrays.length }, (_, k) => arrays[k][i]);