1040       const dir = opfsUtil.rootDirectory, opt = {recurse: true};  variable
1042         dir.removeEntry(handle.name, opt);
1117     opfsUtil.traverse = async function(opt){  argument
1122       if('function'===typeof opt){
1123         opt = {callback:opt};  variable
1125       opt = Object.assign(defaultOpt, opt||{});
1128           if(false === opt.callback(handle, dirHandle, depth)) return false;
1129           else if(opt.recursive && 'directory' === handle.kind){
1134       doDir(opt.directory, 0);
1142         const opt = sqlite3.oo1.DB.dbCtorHelper.normalizeArgs(...args);
1143         opt.vfs = opfsVfs.$zName;
1144         sqlite3.oo1.DB.dbCtorHelper.call(this, opt);