useref/lib/parseBuildBlock.js

Parse build blocks in HTML files to replace references

const resources = require('./resources');

module.exports = block => {
  const parts = block.match(resources.regbuild);

  return {
    type: parts[1],
    alternateSearchPaths: parts[2],
    target: parts[3] && parts[3].trim(),
    attbs: parts[4] && parts[4].trim()
  };
};