ran npm run tdd

test/primes/primes.js

@@ -1,7 +1,8 @@
-module.exports = primes = num => {
+const primes = num => {
 let arr = Array.from({ length: num - 1 }).map((x, i) => i + 2),
 sqroot = Math.floor(Math.sqrt(num)),
 numsTillSqroot = Array.from({ length: sqroot - 1 }).map((x, i) => i + 2);
 numsTillSqroot.forEach(x => (arr = arr.filter(y => y % x !== 0 || y == x)));
 return arr;
-};
+};
+ module.exports = primes