They now have two production build variations (I’m guessing two Webpack config):... | Hacker News

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		wongmjane on Aug 6, 2020 \| parent \| context \| favorite \| on: Twitter web app now runs ES6+, reducing polyfill b... They now have two production build variations (I’m guessing two Webpack config): modern: ES6+, less polyfill legacy: ES5, more polyfill The appropriate variation is served by detecting browser’s version from the User-Agent string

axlee on Aug 6, 2020 | [–]

Note: since v8.0, Angular comes with built-in differential loading and will do all the heavy lifting to achieve exactly that.

https://angular.io/guide/deployment#differential-loading

wongmjane on Aug 6, 2020 | [–]

update: a Twitter engineer explained how they implemented it in greater detail

https://twitter.com/charliecroom/status/1291478104016289799

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