It was fairly easy.

Presets are the time saver.

npm i -D babel rollup rollup-plugin-babel babel-preset-es2015-rollup

That's it already for Rollupjs based project :-)

I haven't had a chance to upgrade Babel in React.js based projects. But npm i -D babel babel-preset-react should do the job.

Quite easy once you understand about the new .babelrc and the plugins/transforms config. The only blowback right know in my daily work is the lack of ES6 decorators. Because the spec changed too much, they decided to remove the support until a clear spec is defined.