ran npm run tdd

test/on/on.js

@@ -1,5 +1,6 @@
-module.exports = on = (el, evt, fn, opts = {}) => {
+const on = (el, evt, fn, opts = {}) => {
 const delegatorFn = e => e.target.matches(opts.target) && fn.call(e.target, e);
 el.addEventListener(evt, opts.target ? delegatorFn : fn, opts.options || false);
 if (opts.target) return delegatorFn;
-};
+};
+ module.exports = on