Welcome to the Treehouse Community

Want to collaborate on code errors? Have bugs you need feedback on? Looking for an extra set of eyes on your latest project? Get support with fellow developers, designers, and programmers of all backgrounds and skill levels here with the Treehouse Community! While you're at it, check out some resources Treehouse students have shared here.

Looking to learn something new?

Treehouse offers a seven day free trial for new students. Get access to thousands of hours of content and join thousands of Treehouse students and alumni in the community today.

Start your free trial

JavaScript Transpiling with Standalone Babel CLI

Brendan Whiting
seal-mask
.a{fill-rule:evenodd;}techdegree seal-36
Brendan Whiting
Front End Web Development Techdegree Graduate 84,735 Points
Posted by Brendan Whiting
.a{fill-rule:evenodd;}techdegree seal-36
Brendan Whiting
Front End Web Development Techdegree Graduate 84,735 Points

What does the transpiler do with the Map or Promise objects?

I'm running some bits of ES2015 code through the babeljs.io playground, and it just seems to leave Map and Promise objects as is in the "old" javascript. How does that work with the old browsers?

1 Answer

akak
akak
29,445 Points
akak
akak
29,445 Points

Babel adds polyfills for those. Read more here: https://babeljs.io/docs/usage/polyfill/