@sequencemedia/css-purge/src/utils/component-from-string.mjs

A CSS tool written in Node JS as a command line app or library for the purging, burning, reducing, shortening, compressing, cleaning, trimming and formatting of duplicate, extra, excess or bloated CSS.

export default function componentFromString (string, max) {
  let component = 0

  if (/%$/g.test(string)) { // is percentage
    component = Math.floor(max * (parseFloat(string) / 100.0))
  } else {
    component = parseInt(string)
  }

  return component
}