Deploying ES2015+ Code in Production Today

Philip Walton suggests making two copies of your production JavaScript. Easy enough to do with a Babel-based build process.

<!-- Browsers with ES module support load this file. -->
<script type="module" src="main.js"></script>

<!-- Older browsers load this file (and module-supporting -->
<!-- browsers know *not* to load this file). -->
<script nomodule src="main-legacy.js"></script>

He put together a demo project for it all and you're looking at 50% file size savings. I would think there would be other speed improvements as well, by using modern JavaScript methods directly.

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