Gulp and Grunt are task runners .. My vote goes for npm scripts, directly on your package.json or if you are really searching for a build system, webpack ..

:+1: for webpack with npm scripts. I would start from Gulp before digging into a bundler, though, but it depends on what you are doing.

Rollup should also be on the list. as well as babel

Webpack should be on your list (:

Gulp's API is beginner friendly and easy to digest