he/him 
jsdom v10 released, with a new, much-more-usable public API surface! Docs: https://github.com/tmpvar/jsdom/blob/master/README.md … Changelog: https://github.com/tmpvar/jsdom/blob/master/Changelog.md …
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That doesn't seem like a reason to me to drop support. In Jest we turned on the babel plugin for that and we compile it pre publish.
Devs needs incentives to upgrade or else we'll be stuck with old Node versions forever.
