rollup-config-analyzer 
Mad metrics for your rollup bundles, know all the things
rollup-config-analyzer
See what's bloating your bundle, how treeshaking has treated you, and other great stuff. Perfect for console printing an analysis of your bundle or integrating in your CI workflows.
Comes in two scrumptious flavors:
rollup-plugin-analyzer
Adding as a plugin to your rollup config or build script will allow you to print a well formatted analysis to the console upon bundling or get a full analysis object for CI purposes.
rollup-config-analyzer
If using Rollup's CLI to bundle with no additional config, pass
-c node:rollup-config-analyzer to print a well formatted analysis to your console.
Install
$ npm install --save-dev rollup-config-analyzerUsage
rollup -c node:rollup-config-analyzer -f cjs -o index.js module.jsResults
Something like this will be logged to stderr on bundle completion
-----------------------------Rollup File Analysis-----------------------------bundle size: 2.809 KBoriginal size: 11.384 KBcode reduction: 75.33 %-----------------------------file: \test\fixtures\import-d.jsbundle space: 90.64 %rendered size: 2.546 KBoriginal size: 2.57 KBcode reduction: 0.93 %dependents: 1 - \test\fixtures\import-c.js-----------------------------file: \test\fixtures\bundle.jsbundle space: 4.27 %rendered size: 120 Bytesoriginal size: 267 Bytescode reduction: 55.06 %dependents: 0-----------------------------file: \test\fixtures\import-c.jsbundle space: 2.95 %rendered size: 83 Bytesoriginal size: 161 Bytescode reduction: 48.45 %dependents: 1 - \test\fixtures\import-b.js...License
MIT © Andrew Carpenter