js: Drop common.BindToGlobal

js/bundle.go

@@ -330,10 +330,7 @@ func (b *Bundle) instantiate(logger logrus.FieldLogger, rt *goja.Runtime, init *
 	}
 	init.moduleVUImpl.initEnv = initenv
 	init.moduleVUImpl.ctx = context.Background()
-	unbindInit := common.BindToGlobal(rt, map[string]interface{}{
-		"require": init.Require,
-		"open":    init.Open,
-	})
+	unbindInit := b.setInitGlobals(rt, init)
 	init.moduleVUImpl.eventLoop = newEventLoop(init.moduleVUImpl)
 	err := init.moduleVUImpl.eventLoop.start(func() error {
 		_, err := rt.RunProgram(b.Program)
@@ -361,6 +358,20 @@ func (b *Bundle) instantiate(logger logrus.FieldLogger, rt *goja.Runtime, init *
 	return nil
 }
 
+func (b *Bundle) setInitGlobals(rt *goja.Runtime, init *InitContext) (unset func()) {
+	mustSet := func(k string, v interface{}) {
+		if err := rt.Set(k, v); err != nil {
+			panic(fmt.Errorf("failed to set '%s' global object: %w", k, err))
+		}
+	}
+	mustSet("require", init.Require)
+	mustSet("open", init.Open)
+	return func() {
+		mustSet("require", goja.Undefined())
+		mustSet("open", goja.Undefined())
+	}
+}
+
 func generateSourceMapLoader(logger logrus.FieldLogger, filesystems map[string]afero.Fs,
 ) func(path string) ([]byte, error) {
 	return func(path string) ([]byte, error) {

js/common/bridge.go

@@ -1,23 +1,3 @@
-/*
- *
- * k6 - a next-generation load testing tool
- * Copyright (C) 2016 Load Impact
- *
- * This program is free software: you can redistribute it and/or modify
- * it under the terms of the GNU Affero General Public License as
- * published by the Free Software Foundation, either version 3 of the
- * License, or (at your option) any later version.
- *
- * This program is distributed in the hope that it will be useful,
- * but WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
- * GNU Affero General Public License for more details.
- *
- * You should have received a copy of the GNU Affero General Public License
- * along with this program.  If not, see <http://www.gnu.org/licenses/>.
- *
- */
-
 package common
 
 import (
@@ -113,21 +93,3 @@ func (FieldNameMapper) FieldName(t reflect.Type, f reflect.StructField) string {
 // MethodName is part of the goja.FieldNameMapper interface
 // https://godoc.org/github.com/dop251/goja#FieldNameMapper
 func (FieldNameMapper) MethodName(t reflect.Type, m reflect.Method) string { return MethodName(t, m) }
-
-// BindToGlobal Binds an object's members to the global scope. Returns a function that un-binds them.
-// Note that this will panic if passed something that isn't a struct; please don't do that.
-func BindToGlobal(rt *goja.Runtime, data map[string]interface{}) func() {
-	keys := make([]string, len(data))
-	i := 0
-	for k, v := range data {
-		rt.Set(k, v)
-		keys[i] = k
-		i++
-	}
-
-	return func() {
-		for _, k := range keys {
-			rt.Set(k, goja.Undefined())
-		}
-	}
-}

js/common/bridge_test.go

@@ -277,14 +277,6 @@ func TestFieldNameMapper(t *testing.T) {
 	}
 }
 
-func TestBindToGlobal(t *testing.T) {
-	rt := goja.New()
-	unbind := BindToGlobal(rt, map[string]interface{}{"a": 1})
-	assert.Equal(t, int64(1), rt.Get("a").Export())
-	unbind()
-	assert.Nil(t, rt.Get("a").Export())
-}
-
 func BenchmarkProxy(b *testing.B) {
 	types := []struct {
 		Name, FnName string
@@ -411,7 +403,6 @@ func BenchmarkProxy(b *testing.B) {
 						b.Run("Call", func(b *testing.B) {
 							rt := goja.New()
 							rt.SetFieldNameMapper(FieldNameMapper{})
-							// ctx := context.Background()
 							fn := func() {}
 							typ.Fn(b, fn)
 						})