Bundling and testing in maven is already done by separate tools. It is just that maven have some defaults (dependent on the packaging selected) which tools may

Bundling and testing in maven is already done by separate tools. It is just that maven have some defaults (dependent on the packaging selected) which tools may cover such tasks. I think NPM made one step too far - it removed whole build structure from the build tool. NPM is just package manager and simple run utility (both based on horrible package.json configuration, even maven's verbose XML pom.xml are better). There is no compilation step, verification step etc. - there are just cli commands you can preconfigure in package.json.