I have a piece of go that imports gopherjs

package main

import (
    "github.com/gopherjs/gopherjs/js"
)

func main() {
    js.Global.Set("mypackage", map[string]interface{}{
        "DoSomething":         DoSomething,
    })

    println("gopher bindings loaded")
}

func DoSomething() {
  print("done!")
}

I then vendor gopherjs and try to do a gopherjs build. the command succeeds but the generated code fails as soon as it tries to use 'js.Global.Set' because of nil pointer.

If I then delete the vendor/ directory and rebuild everything works fine.

Is there something else I should be vendoring in order for this to work? Or what is the expected workflow?