Why doesn't babel-standalone@6 work in Firefox 20?

Question

I wrote the some code and when opened the page in browser (Firefox 20.0), it showed following error in console:

JS: https://unpkg.com/babel-standalone@6/babel.min.js

TypeError: e.forEach is not a function @ https://unpkg.com/babel-standalone@6/babel.min.js:8

CODE:

<script type="text/babel">
   let input = [1, 2, 3];
   console.log(typeof input);
</script>

I observed that using " let " or " var " doesn't make a difference. It is crashing even before reaching those lines. Why is it so? Am I missing something?

PS: Although I can use NPM and browserify to use babel but i just want to test it using this script.

Answer 1

This appears to be because the version of Firefox you're using is not supported by Lodash, which Babel depends on https://github.com/lodash/lodash/issues/2924

Generally babel-standalone targets standard ES5 environments, but this appears to be a case that we can't address since it is in one of our dependencies.