const rule = { tag: "details", before(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(state) { state.push("bbcode_close", "details", -1); }, }; export function setup(helper) { helper.allowList([ "summary", "summary[title]", "details", "details[open]", "details.elided", ]); helper.registerPlugin((md) => { md.block.bbcode.ruler.push("details", rule); }); }