Register a k6/experimental/tracing

Although we do not expose any of user-facing logic at this point, we
register the "k6/experimental/tracing" module in k6 to prepare for
further implementation of public APIs

js/jsmodules.go

@@ -8,6 +8,7 @@ import (
 	"go.k6.io/k6/js/modules/k6/data"
 	"go.k6.io/k6/js/modules/k6/encoding"
 	"go.k6.io/k6/js/modules/k6/execution"
+	"go.k6.io/k6/js/modules/k6/experimental/tracing"
 	"go.k6.io/k6/js/modules/k6/grpc"
 	"go.k6.io/k6/js/modules/k6/html"
 	"go.k6.io/k6/js/modules/k6/http"
@@ -30,6 +31,7 @@ func getInternalJSModules() map[string]interface{} {
 		"k6/experimental/redis":      redis.New(),
 		"k6/experimental/websockets": &expws.RootModule{},
 		"k6/experimental/timers":     timers.New(),
+		"k6/experimental/tracing":    tracing.New(),
 		"k6/net/grpc":                grpc.New(),
 		"k6/html":                    html.New(),
 		"k6/http":                    http.New(),

js/modules/k6/experimental/tracing/module.go

@@ -0,0 +1,42 @@
+// Package tracing implements a k6 JS module for instrumenting k6 scripts with tracing context information.
+package tracing
+
+import (
+	"go.k6.io/k6/js/modules"
+)
+
+type (
+	// RootModule is the global module instance that will create Client
+	// instances for each VU.
+	RootModule struct{}
+
+	// ModuleInstance represents an instance of the JS module.
+	ModuleInstance struct {
+		vu modules.VU
+	}
+)
+
+// Ensure the interfaces are implemented correctly
+var (
+	_ modules.Instance = &ModuleInstance{}
+	_ modules.Module   = &RootModule{}
+)
+
+// New returns a pointer to a new RootModule instance
+func New() *RootModule {
+	return &RootModule{}
+}
+
+// NewModuleInstance implements the modules.Module interface and returns
+// a new instance for each VU.
+func (*RootModule) NewModuleInstance(vu modules.VU) modules.Instance {
+	return &ModuleInstance{
+		vu: vu,
+	}
+}
+
+// Exports implements the modules.Instance interface and returns
+// the exports of the JS module.
+func (mi *ModuleInstance) Exports() modules.Exports {
+	return modules.Exports{}
+}