Function block

static/editor.md/lib/codemirror/mode/javascript/javascript.js:478–481

(type)

    return cont(pushlex(end, info), commasep(what, end), poplex);
  }
  function block(type) {
    if (type == "}") return cont();
    return pass(statement, block);
  }
  function maybetype(type) {
    if (isTS && type == ":") return cont(typedef);
  }