Correct way of including polyfills

[lukeapage]

Trying to follow the documentation, I found the example doesn't work... ?

1. MutationObserver.js pulled in by the first script tag runs immediately and requires WeakMap, so that throws an exception
2. after running jspm install github:polymer/mutationobservers I can reach the package with polymer/mutationobservers - just using mutationobservers fails.

I don't know if this is due to a later version of jspm, I'm not doing anything crazy, just following the setup of the skeleton project.

I guess if I am correct this will need changing in the other languages.

[EisenbergEffect]

Hey Luke! Thanks for your contribution. Would you mind signing our CLA? https://docs.google.com/forms/d/1Npd68d32UDUKUYuCDDrW0VN5Lv8p-a6Ziaa2JFKp6Cg/viewform?c=0&w=1

@AshleyGrant I can't remember who tested this polyfill out originally. Was it you? If not, can you link that person in so we can investigate Luke's PR?

[lukeapage]

Done

[EisenbergEffect]

Thanks! One of our core team members who was working on IE9 support will investigate this shortly.

[AshleyGrant]

@zewa666 and @martingust should take a look at this.

[zewa666]

Yeah it seems that from some updates ago JSPM installs github endpoints always as [authorname]/[projectname] instead as [projectname] inside the config.js map section. I've checked @lukeapage fix and it works 👍

@EisenbergEffect this ones ok to be merged

[lukeapage]

And the script tag was a mistake?

[zewa666]

I guess so, tbh can't remember any more :) But I tried it now with IE9 without the script tag and it works

[EisenbergEffect]

Thanks everyone! I will get this updated shortly.

[EisenbergEffect]

On a somewhat related note...I wonder if we could feature detect mutation observers in the bootstrapper and then dynamically load that polyfill. Thoughts?

[lukeapage]

If the polyfill is bundled (which it would have to be for a production build?), the cost to get into the polyfill is minimal and presumably the first thing it does is feature detect.. So imo probably not worth it.