Meh, the ES6 features this needs don&#x27;t need transpilation, just Promises. They&#x27;re perfectly well stubbable with a library (such as Core-js or Bluebird) so you don&#x27;t actually need to transpile stuff &quot;again&quot; to ES5.<p>But note that it&#x27;s shipped as a babel plugin, so you shouldn&#x27;t even need to care.<p>What this really is is &quot;use the currently-most-popular JS transformation toolchain to transform cool-JS to works-in-browser-JS&quot;. Whether part X is in the ES6 standard and part Y might end up in ES7 is really mostly besides the point.