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

test/chunk/chunk.js

@@ -1,4 +1,4 @@
-module.exports = (arr, size) =>
+module.exports = chunk = (arr, size) =>
 Array.from({ length: Math.ceil(arr.length / size) }, (v, i) =>
 arr.slice(i * size, i * size + size)
 );