IE11 support via babel

[bdon]

Describe the bug The geoblaze build is not compatible with IE11, which is 2-3% of web traffic. Since the project is already using webpack/babel, it may be reasonable to specify older browsers as transpile/polyfill targets, but I'm not sure how to make this happen with the current .babelrc setup.

[DanielJDufour]

Hi, @bdon . Thank you for the comment. I absolutely agree. Would you be able to share a screenshot of the errors that you are encountering? I'm wondering if the issue could be solved by adding specific babel plugins to the .babelrc . Is there another webpack setup you know that could work or could refer us to? Would you be interested in making a PR? In either case, thank you!

[bdon]

after I run npm run build I am using geoblaze.web.min.js which still seems to be an es6 file, it uses the spread operator on line 21, col 21365. You can try http://bdon.org/geoblaze with ie11 on browserling.com . I thought that having preset-env defined in .babelrc would be good enough to ensure transpiling to es5, but that doesn't seem to work...

[DanielJDufour]

Okay. That's good information. It's not ideal, but perhaps we can just add the relevant babel plugins until it works on IE 11. https://babeljs.io/docs/en/babel-plugin-transform-spread

[bdon]

When I run npm run build I see that it's already using transform-spread { "ie":"10", "safari":"7" } in the output log, but this doesn't seem to affect the created dist/geoblaze.web.js, which has the spread operator (you can grep it for (... am I missing something?