bankai/lib/graph-style.js

var purify = require('purify-css')
var Clean = require('clean-css')
var assert = require('assert')

var clean = new Clean(createCleanCssOptions())

module.exports = node

function node (state, createEdge) {
  assert.strictEqual(typeof state.metadata.entry, 'string', 'state.metadata.entries should be type string')

  assert.ok(state.scripts.bundle, 'bankai/node-style: state.script.bundle exists')
  assert.ok(state.scripts.style, 'bankai/node-style: state.script.style exists')

  var script = String(state.scripts.bundle.buffer)
  var style = String(state.scripts.style.buffer)
  var bundle

  try {
    bundle = purify(script, style)
  } catch (e) {
    this.emit('error', 'styles', 'purify-css', e)
  }

  if (!state.metadata.watch) {
    try {
      bundle = clean.minify(bundle).styles
    } catch (e) {
      this.emit('error', 'styles', 'clean-css', e)
    }
  }

  createEdge('bundle', Buffer.from(bundle), {
    mime: 'text/css'
  })
}

function createCleanCssOptions () {
  return {
    level: {
      1: {
        specialComments: 0
      }
    }
  }
}