text: module.exports = function(plugin, change) {
      const { state } = change;
      const blockStart = state.document.getDescendant('anchor');
  
      const withCursor = change
          .collapseToStartOf(blockStart);
  
      plugin.onKeyDown(
          {
              key: 'Backspace',
              preventDefault() {},
              stopPropagation() {}
          },
          withCursor
      );
  
      return change;
  };
  