I'd like to summarize status of the "spread object merge" ES feature, in browsers, and in the ecosystem via tools.
- https://github.com/tc39/proposal-object-rest-spread
- This language feature [is a stage 4 proposal][2], which means it's been merged into the ES language spec, but not yet widely implemented.
- Browser support for "spread properties" [shipped in Chrome 60][1], including this scenario.