Plugins: allow outpurs to copy from input (#14960)

provider/go.go

@@ -1,6 +1,7 @@
 package provider
 
 import (
+	"errors"
 	"fmt"
 	"reflect"
 
@@ -144,6 +145,10 @@ func (p *Go) handleGetter() (any, error) {
 }
 
 func (p *Go) handleSetter(param string, val any) error {
+	if err := transformInputs(p.in, p.setParam); err != nil {
+		return err
+	}
+
 	if err := p.setParam(param, val); err != nil {
 		return err
 	}
@@ -168,6 +173,10 @@ func (p *Go) evaluate() (res any, err error) {
 		return nil, err
 	}
 
+	if !v.IsValid() {
+		return nil, errors.New("missing result")
+	}
+
 	if (v.Kind() == reflect.Pointer || v.Kind() == reflect.Interface) && v.IsNil() {
 		return nil, nil
 	}

provider/javascript.go

@@ -125,6 +125,10 @@ func (p *Javascript) handleGetter() (any, error) {
 }
 
 func (p *Javascript) handleSetter(param string, val any) error {
+	if err := transformInputs(p.in, p.setParamSync); err != nil {
+		return err
+	}
+
 	javascript.Lock()
 	if err := p.setParam(param, val); err != nil {
 		javascript.Unlock()