jgoz opened a new pull request #11357:
URL: https://github.com/apache/druid/pull/11357
### Description
There are some ES6 features, such as `Proxy`, that would make sense to use
in various parts of the web console. Unfortunately, many of these cannot be
polyfilled and therefore cannot be used in older browsers like IE11.
Since IE11 will be officially retired in about 1 year and its rendering
engine still exists inside of the new Edge for those who need it, there is no
compelling reason to continue supporting it in the web console. Dropping IE and
other browsers that lack ES6 support will both slim down the JS payload and
allow us to use new ES features that have ostensibly been available for a few
years in the majority of browsers.
<hr>
##### Key changes
* Consolidate and update `browserslist` declaration to include only those
browsers that support ES6
* Update TypeScript compilation target to `es2016`
* Add a banner to `unified-console.html` if an unsupported browser is
detected (using existence of `Proxy` as a rough indicator of support)
<hr>
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This PR has:
- [x] been self-reviewed.
- [x] been tested in a test Druid cluster.
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