code: function plugin(options) {
      options = defaultsDeep({}, options, defaults);
  
      this.Compiler = compiler;
  
      function compiler(node, file) {
          const root = node && node.type && node.type === 'root';
          const bemjson = toBemjson(node, { augment: options.augment });
  
          const bjsonString = options.export ? JSON.stringify(bemjson, null, 4) : '';
  
          if (file.extname) {
              file.extname = '.js';
          }
  
          if (file.stem) {
              file.stem = file.stem + '.bemjson';
          }
  
          file.data = bemjson;
  
          return root ? createExport({ type: options.exportType, name: options.exportName }, bjsonString) : bjsonString;
      }
  }
docs: remark bemjson compiler plugin
  
  @param {Object} options - plugin options
  @param {ExportType} [options.exportType=commonJS] - export type.
  @param {string} [options.exportName] - if export to browser requires name.
  @param {Function} [options.augment] - transform callback.