code: function toComment (sourceMap) {
    // eslint-disable-next-line no-undef
    var base64 = btoa(unescape(encodeURIComponent(JSON.stringify(sourceMap))))
    var data = 'sourceMappingURL=data:application/json;charset=utf-8;base64,' + base64
  
    return '/*# ' + data + ' */'
  }
docs: Adapted from convert-source-map (MIT)