How to use MustEval method of rod Package

Best Rod code snippet using rod.MustEval

room.go

Source:room.go

...55		}56		return zerolog.InfoLevel57	}())58	l.Info("Starting room...")59	page.MustEval(conf.String())60	page.MustExpose("emit", func(j gson.JSON) (interface{}, error) {61		return proccessEvent(r, j)62	})63	link := registerEvents(r, page)64	stop := make(chan bool)65	r.Scheduler().Delayed(5*time.Second, func() {66		stop <- true67	})68	select {69	case <-stop:70		l.Error("Token is not valid!")71		os.Exit(1)72	case link := <-link:73		l.Info("Successfully started!")74		l.Infof("Room link: %v", link)75		r.link = link76	}77	return r78}79// Obtains room link.80func (r *Room) Link() string {81	return r.link82}83// Gets logger.84func (r *Room) Logger() *Logger {85	return r.logger86}87// Gets scheduler.88func (r *Room) Scheduler() *Scheduler {89	return r.scheduler90}91// Waits receive signal to shutdown room properly.92func (r *Room) Shutdown() {93	c := make(chan os.Signal, 1)94	signal.Notify(c, os.Interrupt, syscall.SIGTERM)95	<-c96	r.browser.MustClose()97}98// Sends a formatted host announcement with msg as contents. Unlike sendChat,99// announcements will work without a host player and has a larger limit on the number of characters.100func (r *Room) Announcef(format string, v ...interface{}) {101	r.Announce(fmt.Sprintf(format, v...))102}103// Sends a host announcement with msg as contents. Unlike sendChat,104// announcements will work without a host player and has a larger limit on the number of characters.105func (r *Room) Announce(msg string) {106	// todo: add missing fields107	r.page.MustEval(`room.sendAnnouncement("` + msg + `")`)108}109// Sends a formatted chat message using the host player.110func (r *Room) Messagef(format string, v ...interface{}) {111	r.Message(fmt.Sprintf(format, v...))112}113// Sends a chat message using the host player.114func (r *Room) Message(msg string) {115	r.page.MustEval(`room.sendChat("` + msg + `")`)116}117// Clears the ban for a playerId that belonged118// to a player that was previously banned.119func (r *Room) ClearBan(id int) {120	r.page.MustEval(`room.clearBan(` + strconv.Itoa(id) + `)`)121}122// Clears the list of banned players.123func (r *Room) ClearBans() {124	r.page.MustEval(`room.clearBans()`)125}126// Sets the time limit of the room. The limit must be specified in number of minutes.127//128// If a game is in progress this method does nothing.129func (r *Room) SetTimeLimit(val int) {130	r.page.MustEval(`room.setTimeLimit(` + strconv.Itoa(val) + `)`)131}132// Parses the value as a .hbs stadium file and sets it as the selected stadium.133//134// There must not be a game in progress, if a game is in progress this method does nothing.135func (r *Room) SetCustomStadium(val string) {136	r.page.MustEval(`room.setCustomStadium(` + val + `)`)137}138// Sets the selected stadium to one of the default stadiums.139// The name must match exactly. (case sensitive)140//141// There must not be a game in progress, if a game is in progress this method does nothing.142func (r *Room) SetDefaultStadium(name string) {143	r.page.MustEval(`room.setDefaultStadium(` + name + `)`)144}145// Sets the teams lock. When teams are locked players are not able to change team unless they are moved by an admin.146func (r *Room) SetTeamsLock(val bool) {147	r.page.MustEval(`room.setTeamsLock(` + strconv.FormatBool(val) + `)`)148}149// setTeamColors150// Starts the game, if a game is already in progress this method does nothing.151func (r *Room) StartGame() {152	r.page.MustEval(`room.startGame()`)153}154// Stops the game, if no game is in progress this method does nothing.155func (r *Room) StopGame() {156	r.page.MustEval(`room.stopGame()`)157}158// Sets the pause state of the game.159func (r *Room) PauseGame(val bool) {160	r.page.MustEval(`room.pauseGame(` + strconv.FormatBool(val) + `)`)161}162// If a game is in progress it returns the current score information. Otherwise it returns null.163func (r *Room) GetScores() *scores {164	obj := r.page.MustEval(`room.getScores()`).Map()165	if len(obj) != 0 {166		return newScores(obj)167	}168	return nil169}170// Returns the ball's position in the field or null if no game is in progress.171func (r *Room) GetBallPosition() *mgl32.Vec2 {172	obj := r.page.MustEval(`room.getBallPosition()`).Map()173	if len(obj) == 2 {174		return &mgl32.Vec2{175			float32(obj["x"].Num()),176			float32(obj["y"].Num()),177		}178	}179	return nil180}181// Starts recording of a haxball replay.182//183// Don't forget to call stop recording or it will cause a memory leak.184func (r *Room) StartRecording() {185	r.page.MustEval(`room.startRecording()`)186}187// Stops the recording previously started with startRecording and returns the replay file contents as a []uint8.188//189// Returns null if recording was not started or had already been stopped.190func (r *Room) StopRecording() []uint8 {191	var buf []uint8192	for _, b := range r.page.MustEval(`room.stopRecording()`).Arr() {193		buf = append(buf, uint8(b.Int()))194	}195	if len(buf) == 0 {196		return nil197	}198	return buf199}200// Changes the password of the room, if pass is null the password will be cleared.201func (r *Room) SetPassword(val string) {202	r.page.MustEval(`room.setPassword("` + val + `")`)203}204// Activates or deactivates the recaptcha requirement to join the room.205func (r *Room) SetRequireRecaptcha(val bool) {206	r.page.MustEval(`room.setRequireRecaptcha(` + strconv.FormatBool(val) + `)`)207}208// reorderPlayers209// Sets the room's kick rate limits.210//211// `min` is the minimum number of logic-frames between two kicks. It is impossible to kick faster than this.212//213// `rate` works like `min` but lets players save up extra kicks to use them later depending on the value of `burst`.214//215// `burst` determines how many extra kicks the player is able to save up.216func (r *Room) SetKickRateLimit(min int, rate int, burst int) {217	r.page.MustEval(`room.setKickRateLimit(` + strconv.Itoa(min) + `, ` + strconv.Itoa(rate) + `, ` + strconv.Itoa(burst) + `)`)218}219// setDiscProperties220// getDiscProperties221// Gets the number of discs in the game including the ball and player discs.222func (r *Room) GetDiscCount() int {223	return r.page.MustEval(`room.getDiscCount()`).Int()224}225// CollisionFlags226// Returns the current list of players.227func (r *Room) GetPlayers() []*Player {228	defer r.pMutex.RUnlock()229	r.pMutex.Lock()230	slice := make([]*Player, len(r.players))231	for _, p := range r.players {232		slice = append(slice, p)233	}234	return slice235}236// Gets a player from room. (returns nil if player doesn't exists)237func (r *Room) GetPlayer(id int) *Player {...

page_eval_test.go

Source:page_eval_test.go

...10)11func TestPageEvalOnNewDocument(t *testing.T) {12	g := setup(t)13	p := g.newPage()14	p.MustEvalOnNewDocument(`window.rod = 'ok'`)15	// to activate the script16	p.MustNavigate(g.blank())17	g.Eq(p.MustEval("() => rod").String(), "ok")18	g.Panic(func() {19		g.mc.stubErr(1, proto.PageAddScriptToEvaluateOnNewDocument{})20		p.MustEvalOnNewDocument(`1`)21	})22}23func TestPageEval(t *testing.T) {24	g := setup(t)25	page := g.page.MustNavigate(g.blank())26	g.Eq(3, page.MustEval(`27		(a, b) => a + b28	`, 1, 2).Int())29	g.Eq(10, page.MustEval(`(a, b, c, d) => a + b + c + d`, 1, 2, 3, 4).Int())30	g.Eq(page.MustEval(`function() {31		return 1132	}`).Int(), 11)33	g.Eq(page.MustEval(`	 ; () => 1; `).Int(), 1)34	// reuse obj35	obj := page.MustEvaluate(rod.Eval(`() => () => 'ok'`).ByObject())36	g.Eq("ok", page.MustEval(`f => f()`, obj).Str())37	_, err := page.Eval(`10`)38	g.Has(err.Error(), `eval js error: TypeError: 10.apply is not a function`)39	_, err = page.Eval(`() => notExist()`)40	g.Is(err, &rod.ErrEval{})41	g.Has(err.Error(), `eval js error: ReferenceError: notExist is not defined`)42}43func TestPageEvaluateRetry(t *testing.T) {44	g := setup(t)45	page := g.page.MustNavigate(g.blank())46	g.mc.stub(1, proto.RuntimeCallFunctionOn{}, func(send StubSend) (gson.JSON, error) {47		g.mc.stub(1, proto.RuntimeCallFunctionOn{}, func(send StubSend) (gson.JSON, error) {48			return gson.New(nil), cdp.ErrCtxNotFound49		})50		return gson.New(nil), cdp.ErrCtxNotFound51	})52	g.Eq(1, page.MustEval(`() => 1`).Int())53}54func TestPageUpdateJSCtxIDErr(t *testing.T) {55	g := setup(t)56	page := g.page.MustNavigate(g.srcFile("./fixtures/click-iframe.html"))57	g.mc.stub(1, proto.RuntimeCallFunctionOn{}, func(send StubSend) (gson.JSON, error) {58		g.mc.stubErr(1, proto.RuntimeEvaluate{})59		return gson.New(nil), cdp.ErrCtxNotFound60	})61	g.Err(page.Eval(`() => 1`))62	frame := page.MustElement("iframe").MustFrame()63	frame.MustReload()64	g.mc.stubErr(1, proto.DOMDescribeNode{})65	g.Err(frame.Element(`button`))66	frame.MustReload()67	g.mc.stubErr(1, proto.DOMResolveNode{})68	g.Err(frame.Element(`button`))69}70func TestPageExpose(t *testing.T) {71	g := setup(t)72	page := g.newPage(g.blank()).MustWaitLoad()73	stop := page.MustExpose("exposedFunc", func(g gson.JSON) (interface{}, error) {74		return g.Get("k").Str(), nil75	})76	utils.All(func() {77		res := page.MustEval(`() => exposedFunc({k: 'a'})`)78		g.Eq("a", res.Str())79	}, func() {80		res := page.MustEval(`() => exposedFunc({k: 'b'})`)81		g.Eq("b", res.Str())82	})()83	// survive the reload84	page.MustReload().MustWaitLoad()85	res := page.MustEval(`() => exposedFunc({k: 'ok'})`)86	g.Eq("ok", res.Str())87	stop()88	g.Panic(func() {89		stop()90	})91	g.Panic(func() {92		page.MustReload().MustWaitLoad().MustEval(`() => exposedFunc()`)93	})94	g.Panic(func() {95		g.mc.stubErr(1, proto.RuntimeCallFunctionOn{})96		page.MustExpose("exposedFunc", nil)97	})98	g.Panic(func() {99		g.mc.stubErr(1, proto.RuntimeAddBinding{})100		page.MustExpose("exposedFunc2", nil)101	})102	g.Panic(func() {103		g.mc.stubErr(1, proto.PageAddScriptToEvaluateOnNewDocument{})104		page.MustExpose("exposedFunc", nil)105	})106}107func TestObjectRelease(t *testing.T) {108	g := setup(t)109	res, err := g.page.Evaluate(rod.Eval(`() => document`).ByObject())110	g.E(err)111	g.page.MustRelease(res)112}113func TestPromiseLeak(t *testing.T) {114	g := setup(t)115	/*116		Perform a slow action then navigate the page to another url,117		we can see the slow operation will still be executed.118	*/119	p := g.page.MustNavigate(g.blank())120	utils.All(func() {121		_, err := p.Eval(`() => new Promise(r => setTimeout(() => r(location.href), 1000))`)122		g.Is(err, cdp.ErrCtxDestroyed)123	}, func() {124		utils.Sleep(0.3)125		p.MustNavigate(g.blank())126	})()127}128func TestObjectLeak(t *testing.T) {129	g := setup(t)130	/*131		Seems like it won't leak132	*/133	p := g.page.MustNavigate(g.blank())134	obj := p.MustEvaluate(rod.Eval("() => ({a:1})").ByObject())135	p.MustReload().MustWaitLoad()136	g.Panic(func() {137		p.MustEvaluate(rod.Eval(`obj => obj`, obj))138	})139}140func TestPageObjectErr(t *testing.T) {141	g := setup(t)142	g.Panic(func() {143		g.page.MustObjectToJSON(&proto.RuntimeRemoteObject{144			ObjectID: "not-exists",145		})146	})147	g.Panic(func() {148		g.page.MustElementFromNode(&proto.DOMNode{NodeID: -1})149	})150	g.Panic(func() {151		node := g.page.MustNavigate(g.blank()).MustElement(`body`).MustDescribe()152		g.mc.stubErr(1, proto.DOMResolveNode{})153		g.page.MustElementFromNode(node)154	})155}156func TestGetJSHelperRetry(t *testing.T) {157	g := setup(t)158	g.page.MustNavigate(g.srcFile("fixtures/click.html"))159	g.mc.stub(1, proto.RuntimeCallFunctionOn{}, func(send StubSend) (gson.JSON, error) {160		return gson.JSON{}, cdp.ErrCtxNotFound161	})162	g.page.MustElements("button")163}164func TestConcurrentEval(t *testing.T) {165	g := setup(t)166	p := g.page.MustNavigate(g.blank())167	list := make(chan int, 2)168	start := time.Now()169	utils.All(func() {170		list <- p.MustEval(`() => new Promise(r => setTimeout(r, 2000, 2))`).Int()171	}, func() {172		list <- p.MustEval(`() => new Promise(r => setTimeout(r, 1000, 1))`).Int()173	})()174	duration := time.Since(start)175	g.Gt(duration, 1000*time.Millisecond)176	g.Lt(duration, 3000*time.Millisecond)177	g.Eq([]int{<-list, <-list}, []int{1, 2})178}179func TestPageSlowRender(t *testing.T) {180	g := setup(t)181	p := g.page.MustNavigate(g.srcFile("./fixtures/slow-render.html"))182	g.Eq(p.MustElement("div").MustText(), "ok")183}184func TestPageIframeReload(t *testing.T) {185	g := setup(t)186	p := g.page.MustNavigate(g.srcFile("./fixtures/click-iframe.html"))187	frame := p.MustElement("iframe").MustFrame()188	btn := frame.MustElement("button")189	g.Eq(btn.MustText(), "click me")190	frame.MustReload()191	btn = frame.MustElement("button")192	g.Eq(btn.MustText(), "click me")193	g.Has(*p.MustElement("iframe").MustAttribute("src"), "click.html")194}195func TestPageObjCrossNavigation(t *testing.T) {196	g := setup(t)197	p := g.page.MustNavigate(g.blank())198	obj := p.MustEvaluate(rod.Eval(`() => ({})`).ByObject())199	g.page.MustNavigate(g.blank())200	_, err := p.Evaluate(rod.Eval(`() => 1`).This(obj))201	g.Is(err, &rod.ErrObjectNotFound{})202	g.Has(err.Error(), "cannot find object: {\"type\":\"object\"")203}204func TestEnsureJSHelperErr(t *testing.T) {205	g := setup(t)206	p := g.page.MustNavigate(g.blank())207	g.mc.stubErr(2, proto.RuntimeCallFunctionOn{})208	g.Err(p.Elements(`button`))209}210func TestEvalOptionsString(t *testing.T) {211	g := setup(t)212	p := g.page.MustNavigate(g.srcFile("fixtures/click.html"))...

main.go

Source:main.go

...27	save := b.MustPage().Context(ctx)28	save.MustNavigate("chrome-extension://cpneebmdjnifhgajfhmcjmdkoknohimd/src/extension/ui/pages/options.html").MustWaitLoad()29	// set auto close30	time.Sleep(time.Millisecond * 100)31	save.MustEval(`document.getElementById('autoCloseInput').click()`)32	save.MustNavigate("chrome-extension://cpneebmdjnifhgajfhmcjmdkoknohimd/src/extension/core/bg/background.html").MustWaitLoad()33	var wg sync.WaitGroup34	var pages sync.Map35	go b.EachEvent(func(e *proto.TargetTargetCreated) {36		switch e.TargetInfo.Type {37		case proto.TargetTargetInfoTypePage:38			{39				_, loaded := pages.LoadOrStore(e.TargetInfo.TargetID, e.TargetInfo)40				if !loaded {41					wg.Add(1)42				}43			}44		}45	})()46	go b.EachEvent(func(e *proto.TargetTargetDestroyed) {47		_, loaded := pages.Load(e.TargetID)48		if loaded {49			wg.Done()50		}51	})()52	// create a new page53	p := b.MustPage().Context(ctx)54	// inject js for some special usage55	p.MustEvalOnNewDocument(preScript)56	p.MustNavigate(defaultUrl).MustWaitLoad()57	//p.EnableDomain(proto.NetworkEnable{})58	//go p.EachEvent(func(e *proto.NetworkRequestWillBeSent) {59	//	fmt.Printf("NetworkRequestWillBeSent %+v\n", e)60	//})()61	//go p.EachEvent(func(e *proto.NetworkResponseReceived) {62	//	fmt.Printf("NetworkResponseReceived  %+v\n", e)63	//})()64	// in this example, it slowly scrolls to the bottom for those lazy loading images65	duration := p.MustEval(postScript)66	// the post script can define how long we wait67	time.Sleep(time.Millisecond * time.Duration(duration.Int()))68	// save page with singlefile69	// https://github.com/puppeteer/puppeteer/issues/2486#issuecomment-60211604770	save.MustEval(`chrome.tabs.query({ active: true }, tabs => {71	chrome.browserAction.onClicked.dispatch(tabs[0]);72})`)73	wg.Wait()74	// check the file path75}...

MustEval

Using AI Code Generation

1import (2func main() {3    l := launcher.New().MustLaunch()4    defer l.Close()5    browser := rod.New().ControlURL(l).MustConnect()6    defer browser.Close()7    page := browser.MustPage("")8    fmt.Println(page.MustEval("() => document.title").String())9}10import (11func main() {12    l := launcher.New().MustLaunch()13    defer l.Close()14    browser := rod.New().ControlURL(l).MustConnect()15    defer browser.Close()16    page := browser.MustPage("")17    fmt.Println(page.MustElement("input").MustProperty("value").String())18}19import (20func main() {21    l := launcher.New().MustLaunch()22    defer l.Close()23    browser := rod.New().ControlURL(l).MustConnect()24    defer browser.Close()25    page := browser.MustPage("")26    page.MustElement("input").MustInput("Hello World")27}28import (29func main() {30    l := launcher.New().MustLaunch()31    defer l.Close()32    browser := rod.New().ControlURL(l).MustConnect()33    defer browser.Close()34    page := browser.MustPage("")35    page.MustElement("input").MustInput("Hello World")36    page.MustElement("input").MustPress("Enter")37}

MustEval

Using AI Code Generation

1import (2func main() {3	browser := rod.New().MustConnect()4	defer browser.MustClose()5	fmt.Println(page.MustEval("() => 1 + 2"))6}7import (8func main() {9	browser := rod.New().MustConnect()10	defer browser.MustClose()11	fmt.Println(page.MustElement("input").Eval("() => 1 + 2"))12}13import (14func main() {15	browser := rod.New().MustConnect()16	defer browser.MustClose()17	fmt.Println(page.MustElement("input").Eval("() => 1 + 2"))18}19import (20func main() {21	browser := rod.New().MustConnect()22	defer browser.MustClose()23	fmt.Println(page.MustElement("input").Eval("() => 1 + 2"))24}25import (26func main() {27	browser := rod.New().MustConnect()28	defer browser.MustClose()29	fmt.Println(page.MustElement("input").Eval("() => 1 + 2"))30}31import (32func main() {33	browser := rod.New().MustConnect()34	defer browser.MustClose()35	fmt.Println(page.MustElement("input").Eval("() => 1 + 2"))36}

MustEval

Using AI Code Generation

1import (2func main() {3	browser := rod.New().MustConnect()4	page.MustElement("input[name=q]").MustInput("rod").MustPress("Enter")5	fmt.Println(page.MustElement(".srg .g").MustEval(`() => this.textContent`).String())6}7import (8func main() {9	browser := rod.New().MustConnect()10	page.MustElement("input[name=q]").MustInput("rod").MustPress("Enter")11	fmt.Println(page.MustElement(".srg .g").MustEval(`() => this.textContent`).String())12}13import (14func main() {15	browser := rod.New().MustConnect()16	page.MustElement("input[name=q]").MustInput("rod").MustPress("Enter")17	fmt.Println(page.MustElement(".srg .g").MustEval(`() => this.textContent`).String())18}19import (20func main() {21	browser := rod.New().MustConnect()22	page.MustElement("input[name=q]").MustInput("rod").MustPress("Enter")23	fmt.Println(page.MustElement(".srg .g").MustEval(`() => this.textContent`).String())24}25import (26func main() {27	browser := rod.New().MustConnect()28	page.MustElement("input[name=q]").MustInput("rod").MustPress("Enter")29	fmt.Println(page.MustElement(".srg .g").MustEval(`() => this.textContent`).String())30}

MustEval

Using AI Code Generation

1import (2func main() {3	browser := rod.New().MustConnect()4	title := page.MustElement("h1").MustText()5	fmt.Println(title)6}7import (8func main() {9	browser := rod.New().MustConnect()10	title := page.MustElement("h1").MustText()11	fmt.Println(title)12}13import (14func main() {15	browser := rod.New().MustConnect()16	title := page.MustElement("h1").MustText()17	fmt.Println(title)18}19import (20func main() {21	browser := rod.New().MustConnect()22	title := page.MustElement("h1").MustText()23	fmt.Println(title)24}25import (26func main() {27	browser := rod.New().MustConnect()28	title := page.MustElement("h1").MustText()29	fmt.Println(title)30}31import (32func main() {33	browser := rod.New().MustConnect()34	title := page.MustElement("h1").MustText()35	fmt.Println(title)36}37import (38func main() {39	browser := rod.New().MustConnect()

MustEval

Using AI Code Generation

1import (2func main() {3	browser := rod.New().MustConnect()4	page.MustElement("input[name=q]").MustInput("rod")5	page.MustElement("input[type=submit]").MustClick()6	page.MustWaitLoad()7	page.MustScreenshot("screenshot.png")8	fmt.Println(page.MustEval("document.title"))9}10import (11func main() {12	browser := rod.New().MustConnect()13	page.MustElement("input[name=q]").MustInput("rod")14	page.MustElement("input[type=submit]").MustClick()15	page.MustWaitLoad()16	page.MustScreenshot("screenshot.png")17	fmt.Println(page.MustEval("document.title"))18}19import (20func main() {21	browser := rod.New().MustConnect()22	page.MustElement("input[name=q]").MustInput("rod")23	page.MustElement("input[type=submit]").MustClick()24	page.MustWaitLoad()25	page.MustScreenshot("screenshot.png")26}27import (28func main() {29	browser := rod.New().Connect()30	page.Element("input[name=q]").Input("rod")31	page.Element("input[type=submit]").Click()32	page.WaitLoad()33	page.Screenshot("screenshot.png")34}35import (36func main() {37	browser := rod.New().MustConnect()38	page.MustElement("input[name=q]").MustInput("rod")39	page.MustElement("input

MustEval

Using AI Code Generation

1import (2func main() {3	title := page.MustElement("title").MustText()4	fmt.Println(title)5}6import (7func main() {8	fmt.Println(title)9}10import (11func main() {12	title := page.MustElementR("title").MustText()13	fmt.Println(title)14}15import (16func main() {17	title := page.MustElement("title").MustText()18	fmt.Println(title)19}20import (21func main() {22	title := page.MustElement("title").MustText()23	fmt.Println(title)24}25import (26func main() {27	title := page.MustElement("title").MustText()28	fmt.Println(title)29}30import (

MustEval

Using AI Code Generation

1import (2func main() {3	browser := rod.New().ControlURL(launcher.New().MustLaunch()).MustConnect()4	page := browser.MustPage("")5	page.MustElement("[name=q]").MustInput("rod")6	page.MustElement("[name=btnK]").MustClick()7	value := page.MustElement("[name=q]").MustEval("el => el.value")8	println(value)9	value, err := page.MustElement("[name=q]").Eval("el => el.value")10	println(value)11	println(err)12	value, err = page.MustElement("[name=q]").Eval(proto.RuntimeCallFunctionOn{13		FunctionDeclaration: proto.RuntimeCallFunctionOnFunctionDeclaration("el => el.value"),14	})15	println(value)16	println(err)17	page.MustClose()18	browser.MustClose()19}20import (21func main() {22	browser := rod.New().ControlURL(launcher.New().MustLaunch()).MustConnect()23	page := browser.MustPage("")

MustEval

Using AI Code Generation

1import (2func main() {3	browser := rod.New().ControlURL(launcher.New().MustLaunch()).MustConnect()4	page.MustEval(`() => {5		throw new Error('some error')6	}`)7	_, err := page.MustEvalE(`() => {8		throw new Error('some error')9	}`)10	if err != nil {11		panic(err)12	}13	page.MustEval(`() => {14		return new Error('some error')15	}`)16	_, err = page.MustEvalE(`() => {17		return new Error('some error')18	}`)19	if err != nil {20		panic(err)21	}22	page.MustEval(`() => {23	}`)24	_, err = page.MustEvalE(`() => {25	}`)26	if err != nil {27		panic(err)28	}29	page.MustEval(`() => {30	}`)31	_, err = page.MustEvalE(`() => {32	}`)33	if err != nil {34		panic(err)35	}

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