Echo JS 0.11.0

Are you referring to the new API such as #array.findIndex ? I think the bublé approach makes sense. Polyfilling, when possible, is better than transpiling because it adapts to the user browser capacities. When using a polyfill service such as polyfill.io, only the necessary polyfills are loaded ; which means smaller bundle size and increased perf with the built-in features. This is actually very smart in my opinion.