Make a "real" polyfill?

[rwjblue]

Ideally, this means:

• Updating to provide self.WeakMap if not present
• Update to ember-cli-babel@6, and use the data from babel-preset-env to have no effect on final asset size if this.project.targets includes only browsers with native weakmap

Some examples of this transition:

• Become a "real" polyfill. ember-polyfills/ember-getowner-polyfill#5
  • Make into a true polyfill ember-polyfills/ember-getowner-polyfill#6
  • Remove extra modules when included by addons. ember-polyfills/ember-getowner-polyfill#9
  • Avoid importing vendor file if not needed. ember-polyfills/ember-getowner-polyfill#7
• Help other addons update to native polyfill workmanw/ember-string-ishtmlsafe-polyfill#5
  • Move polyfill from a module import to "native" Ember.String.isHTMLSafe workmanw/ember-string-ishtmlsafe-polyfill#2
• True polyfill shipshapecode/ember-assign-polyfill#4

The tricky bit will likely be determining if all supported browsers have native weakmaps (but that also sounds like the fun part 😝 ).

[thoov]

Will do @rwjblue. Thanks for the links. I should have this done over the weekend and I will add you to the PR so you can take a look.