Good ol' NPM scripts. Grunt/Gulp/Gradle are completely unnecessary for most cases. As a library author, supporting every 'flavor of the month' build tool is a

Good ol' NPM scripts. Grunt/Gulp/Gradle are completely unnecessary for most cases. As a library author, supporting every 'flavor of the month' build tool is a waste of time/effort that takes away from improving the core. JSPM. Like NPM but for client-side dependencies. It has built-in transpiling, es6-module support, and can build+minify bundles and sfx bundles.