446     open: function(ev){  argument
447       const oargs = Object.create(null), args = (ev.args || Object.create(null));
492     close: function(ev){  argument
493       const db = getMsgDb(ev,false);
498         const doUnlink = ((ev.args && 'object'===typeof ev.args)
499                          ? !!ev.args.unlink : false);
505     exec: function(ev){  argument
507         'string'===typeof ev.args
508       ) ? {sql: ev.args} : (ev.args || Object.create(null));
515       const db = getMsgDb(ev);
582     export: function(ev){
583       const db = getMsgDb(ev);
593     toss: function(ev){
597     'opfs-tree': async function(ev){
604   self.onmessage = async function(ev){  argument
605     ev = ev.data;
606     let result, dbId = ev.dbId, evType = ev.type;
611         result = await wMsgHandler[evType](ev);
613         toss("Unknown db worker message type:",ev.type);
618         operation: ev.type,
621         input: ev
639       messageId: ev.messageId,
642       departureTime: ev.departureTime,