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bug: $module is not defined in browser #1094

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@EwenQuim

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@EwenQuim
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This one is a bit disturbing. I have got a very simple script that works perfectly on node but not on the browser.

package main

import (
	"crypto/ed25519"
	"encoding/base64"

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

func SignMessage(secBase64, pubBase64, displayedName, message, messageId string) string {
	sec, err := base64.URLEncoding.DecodeString(secBase64)
	if err != nil || len(sec) != ed25519.PrivateKeySize {
		return ""
	}
	pub, err := base64.URLEncoding.DecodeString(pubBase64)
	if err != nil {
		return ""
	}
	msgToSign := append([]byte(message), pub...)
	msgToSign = append(msgToSign, []byte(displayedName)...)
	msgToSign = append(msgToSign, []byte(messageId)...)
	signature := ed25519.Sign(sec, msgToSign)
	return base64.URLEncoding.EncodeToString(signature)
}

func main() {
	js.Module.Get("exports").Set("SignMessage", SignMessage)
}

You can easily reproduce it with gopherjs build -o lib.js and this small html file:

<!DOCTYPE html>
<html>
<head>
  <title>Title</title>
  <script src="./lib.js"></script>
</head>
<body>
  Test
  <script>
    console.log(SignMessage("test", "test", "test", "test", ""));
  </script>
</body>
</html>

image

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