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Statistic generation tool for Fela. It collects several information and metrics to better analyze your application CSS.
Right now, it provides the following information:

  • Class count
    • per media query
    • with/without pseudo class
  • Usage per class
  • CSS file size
    • in bytes, kbytes, bytes (gzipped) and kbytes (gzipped)
  • Reuse
    • Reuse ratio (total used classes vs. total unique classes)
  • total classes with pseudo classes
  • total classes inside media queries
  • total renders
  • total used classes


yarn add fela-statistics

You may alternatively use npm i --save fela-statistics.


Adding the statistics enhancer will add a new function to the renderer called getStatistics.
You may call it at any given time, to get the current statistics object.

importcreateRenderer } from 'fela'
import statistics from 'fela-statistics'

const renderer = createRenderer({
  enhancers: [ statistics() ]

// rendering stuff

const stats = renderer.getStatistics()



Fela is licensed under the MIT License.
Documentation is licensed under Creative Common License.
Created with ♥ by @rofrischmann and all the great contributors.