code: function retrieveSnappy() {
    var snappy = null;
    try {
      snappy = require_optional('snappy');
    } catch (error) {} // eslint-disable-line
    if (!snappy) {
      snappy = {
        compress: noSnappyWarning,
        uncompress: noSnappyWarning,
        compressSync: noSnappyWarning,
        uncompressSync: noSnappyWarning
      };
    }
    return snappy;
  }
docs: Facilitate loading Snappy optionally