feat: integrate nebula UI with worker-assets-gen

internal/channel/broadcast.go

@@ -0,0 +1,18 @@
+//go:build js && wasm
+
+package channel
+
+import (
+	"syscall/js"
+
+	"github.com/labstack/echo/v4"
+)
+
+type BroadcastContext struct {
+	echo.Context
+	Channel js.Value
+}
+
+func (c *BroadcastContext) BroadcastMessage(message string) {
+	c.Channel.Call("postMessage", message)
+}