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

test/reducedFilter/reducedFilter.js

@@ -1,4 +1,4 @@
-module.exports = (data, keys, fn) =>
+module.exports = reducedFilter = (data, keys, fn) =>
 data.filter(fn).map(el =>
 keys.reduce((acc, key) => {
 acc[key] = el[key];