https://github.com/gopherjs/gopherjs/issues/136

console.go

package main

import "honnef.co/go/js/console"

func main() {
	console.Log("hello")
}

simple.go

package main

func main() {
}

websocket.go

package main

import (
	"github.com/gopherjs/gopherjs/js"
	"github.com/gopherjs/websocket"
	"honnef.co/go/js/console"
)

func main() {
	console.Log("hello")
	master := websocket.New("http://localhost:9001/ws")
	master.OnOpen(func(obj js.Object) {
		console.Log("opened", obj)
	})
}

websocket_2015-02-03.go

package main

import (
	"github.com/gopherjs/gopherjs/js"
	"github.com/gopherjs/websocket"
	"honnef.co/go/js/console"
)

func main() {
	console.Log("hello")
	master, err := websocket.New("http://localhost:9001/ws")
	if err != nil {
		console.Log("error opening websocket")
	} else {
		master.AddEventListener("open", false, func(obj js.Object) {
			console.Log("opened", obj)
		})
	}
}

websocket_fork.go

package main

import (
	"github.com/gopherjs/gopherjs/js"
	"github.com/liamcurry/websocket"
	"honnef.co/go/js/console"
)

func main() {
	console.Log("hello")
	master := websocket.New("http://localhost:9001/ws")
	master.OnOpen(func(obj js.Object) {
		console.Log("opened", obj)
	})
}