[JS] Fix broken IE11 support by transpiling spread syntax using babel

[ruudsnl]

1️⃣ Is this something that is wanted/needed? Did you create a feature-request issue first?
Yes! It fixes the issue of Livewire not initializing in both IE11 and Edge. The issue can be found here: #585

2️⃣ Does it contain multiple, unrelated changes? Please separate the PRs out.
Nope

3️⃣ Does it include tests if possible? (Not a deal-breaker, just a nice-to-have)
Nope

4️⃣ Please include a thorough description of the feature/fix and reasons why it's useful.

• Added the following Babel plugin to transpile spread syntax in object literals:
  https://babeljs.io/docs/en/babel-plugin-proposal-object-rest-spread which is not supported in IE11 and early versions of Edge
• Furthermore, to prevent similar issues in the future I added IE11 as a target in the Babel config.
• Rebuilt the assets, the compatible version can be found in the dist directory

I have tested this in Edge using Browserstack and it seems to work.

More info on spread syntax compatibility:
https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Operators/Spread_syntax#Spread_in_object_literals

5️⃣ Thanks for contributing! 🙌
More than welcome, thanks for Livewire.

[calebporzio]

Hey @ruudschuurmans, I pulled down the PR (thank you BTW), but all the tests are failing with:

Are you seeing the same thing?

[ruudsnl]

Hey @calebporzio I will check this out tomorrow and follow up. Thanks for letting me know!

[ruudsnl]

Fixed by adding node: current as babel target for the test environment. (more at: jestjs/jest#3126)

[calebporzio]

I can't seem to pull your branch down, did you do any rebasing that might have messed up the tree?

[ruudsnl]

oof, you're right my rebase was not the best way to go. I'll clean up the branch later and ping you!

[calebporzio]

Any progress on this?

[ruudsnl]

@calebporzio Fixed the rebase, now JS tests are working too for me!
Weird thing is, even though no PHP files have been changed in this PR, the PHP tests are failing in the Github CI?

[calebporzio]

Thanks!

[lancepioch]

@all-contributors please add @ruudschuurmans for maintenance

[allcontributors]

@lancepioch

I've put up a pull request to add @ruudschuurmans! 🎉