Here’s the Deal
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When comparing Systemjs-Builder vs rollup, the Slant community recommends rollup for most people. In the question“What are the best frontend JavaScript module bundlers?” rollup is ranked 5th while Systemjs-Builder is ranked 13th. The most important reason people chose rollup is:
Can reduce resulting bundle size by performing "tree-shaking" (removing unused parts of code).
Ranked in these QuestionsQuestion Ranking
Common Questions
Pros
Pro Special support for systemjs-loader
Pro Modern bundling for packages and bundle export
Pro Implements tree-shaking
Can reduce resulting bundle size by performing "tree-shaking" (removing unused parts of code).
Pro Easy configuration
Simple config files
Pro Small and fast installation
It's only one file.
Pro Ideal for shipping es2015/ES6 modules
Cons
Con Can be very slow
Con Async/await support lack
Doesn't support async/await out of the box for the time being, and there is no available working plugin to fill the gap.