Test migration to jest by hand

Apparently using regular expressions is way easier.

test/omit/omit.js

@@ -0,0 +1,5 @@
+const omit = (obj, arr) =>
+Object.keys(obj)
+.filter(k => !arr.includes(k))
+.reduce((acc, key) => ((acc[key] = obj[key]), acc), {
+module.exports = omit;