jsext: move field wrapper config to common VM setup routine

Author: Snawoot

access/jsfilter.go

@@ -46,7 +46,6 @@ func NewJSFilter(filename string, instances int, logger *clog.CondLogger, next F
 			if err != nil {
 				return fmt.Errorf("can't configure runtime: %w", err)
 			}
-			vm.SetFieldNameMapper(goja.TagFieldNameMapper("json", true))
 			_, err = vm.RunString(string(script))
 			if err != nil {
 				return fmt.Errorf("script run failed: %w", err)

dialer/jsrouter.go

@@ -44,7 +44,6 @@ func NewJSRouter(filename string, instances int, factory func(string) (Dialer, e
 			if err != nil {
 				return fmt.Errorf("can't configure runtime runtime: %w", err)
 			}
-			vm.SetFieldNameMapper(goja.TagFieldNameMapper("json", true))
 			_, err = vm.RunString(string(script))
 			if err != nil {
 				return fmt.Errorf("script run failed: %w", err)

jsext/jsext.go

@@ -3,6 +3,7 @@ package jsext
 import "github.com/dop251/goja"
 
 func ConfigureRuntime(vm *goja.Runtime) error {
+	vm.SetFieldNameMapper(goja.TagFieldNameMapper("json", true))
 	if err := AddFileReader(vm); err != nil {
 		return err
 	}