Numeral-js: Numeral can't be imported as an ES2015 modules

[mwcz]

Hello! I'm attempting to import numeral.js with an ES2015 (ES6) import statement and I'm running into trouble. In this particular use case, I'm not transpiling the import to cjs/amd/etc; the import is being handled by the browser.

---

index.html

<script type="module" src="app.js"></script>

app.js

import numeral from './numeral.js';

Result in Chrome: Uncaught SyntaxError: The requested module does not provide an export named 'default'

Result in Firefox: SyntaxError: import not found: default

---

ES6 modules can't be added to a UMD block (unfortunate, but also by design), so I'm working on a PR that creates a separate file, numeral.es6.js, which will be generated by grunt build, and has all the same code as numeral.js but without the IIFE/UMD wrapper, and with export default numeral at the end.

(<script type="module"> is supported in Chrome, Safari, and Edge and is behind a flag in Firefox and Opera (hopefully going mainline soon).)

[mwcz]

The new file, numeral.es6.js looks like this: https://github.com/mwcz/Numeral-js/blob/enable-es2015-import/numeral.es6.js