<commit_before>var importcss = require('rework-npm')
  , rework = require('rework')
  , variables = require('rework-vars')
  , path = require('path')
  , read = require('fs').readFileSync

module.exports = function (opts, cb) {
  opts = opts || {}
  var css = rework(read(opts.entry, 'utf8'))
  css.use(importcss(path.dirname(opts.entry)))
  if (opts.variables) {
    css.use(variables(opts.variables))
  }
  if (opts.transform) {
    opts.transform(file, cb)
  } else {
    cb(null, css.toString())
  }
}<commit_msg>Fix optional transform function<commit_after>var importcss = require('rework-npm')
  , rework = require('rework')
  , variables = require('rework-vars')
  , path = require('path')
  , read = require('fs').readFileSync

module.exports = function (opts, cb) {
  opts = opts || {}
  var css = rework(read(opts.entry, 'utf8'))
  css.use(importcss(path.dirname(opts.entry)))
  if (opts.variables) {
    css.use(variables(opts.variables))
  }
  if (opts.transform) {
    opts.transform(css.toString(), cb)
  } else {
    cb(null, css.toString())
  }
}
{'fraction_non_alphanumeric': 0.17796610169491525, 'fraction_numerical': 0.0018832391713747645, 'mean_word_length': 3.9906103286384975, 'pattern_counts': {'":': 0, '<': 3, '<?xml version=': 0, '>': 3, 'https://': 0, 'lorem ipsum': 0, 'www.': 0, 'xml': 0}, 'pii_count': 0, 'substrings_counts': 0, 'word_list_counts': {'cursed_substrings.json': 0, 'profanity_word_list.json': 0, 'sexual_word_list.json': 0, 'zh_pornsignals.json': 0}}
{'dir': 'git-commits-cleaned', 'id': '3531842', 'n_tokens_mistral': 370, 'n_tokens_neox': 366, 'n_words': 67}