text: const rule = {
    tag: "details",
    before: function(state, tagInfo) {
      const attrs = tagInfo.attrs;
      state.push("bbcode_open", "details", 1);
      state.push("bbcode_open", "summary", 1);
  
      let token = state.push("text", "", 0);
      token.content = attrs["_default"] || "";
  
      state.push("bbcode_close", "summary", -1);
    },
  
    after: function(state) {
      state.push("bbcode_close", "details", -1);
    }
  };
  
  export function setup(helper) {
    helper.whiteList([
      "summary",
      "summary[title]",
      "details",
      "details[open]",
      "details.elided"
    ]);
  
    helper.registerPlugin(md => {
      md.block.bbcode.ruler.push("details", rule);
    });
  }
  