RT @andywritescode@twitter.com
Using #webpack with an ES2015-compatible minifier? Need to support ES5-only browsers (I am looking at you IE 11)?
Run `npx es-check es5 build/*.js`.
Will fail if output bundle is not valid ES5. Very handy if you don't #babeljs your node_modules!
https://www.npmjs.com/package/es-check
#webpack
#babeljs