fix for moleculerjs#1169: getPrototypeOf instead of __proto__

package.json

@@ -26,7 +26,7 @@
     "memleak": "node benchmark/memleak-test.js",
     "proto": "pbjs -t static-module -w commonjs -o src/serializers/proto/packets.proto.js src/serializers/proto/packets.proto",
     "thrift": "thrift -gen js:node -o src\\serializers\\thrift src\\serializers\\thrift\\packets.thrift",
-    "test": "jest --coverage --forceExit",
+    "test": "NODE_OPTIONS=--disable-proto=delete jest --coverage --forceExit",
     "test:unit": "jest --testMatch \"**/unit/**/*.spec.js\" --coverage",
     "test:int": "jest --testMatch \"**/integration/**/*.spec.js\" --coverage",
     "test:e2e": "cd test/e2e && ./start.sh",

src/service-broker.js

@@ -1775,14 +1775,14 @@ class ServiceBroker {
 			return schema;
 		}
 		// Depending how the schema was create the correct constructor name (from base class) will be locate on __proto__.
-		target = utils.getConstructorName(schema.__proto__);
+		target = utils.getConstructorName(Object.getPrototypeOf(schema));
 		if (serviceName === target) {
-			Object.setPrototypeOf(schema.__proto__, this.ServiceFactory);
+			Object.setPrototypeOf(Object.getPrototypeOf(schema), this.ServiceFactory);
 			return schema;
 		}
 		// This is just to handle some idiosyncrasies from Jest.
 		if (schema._isMockFunction) {
-			target = utils.getConstructorName(schema.prototype.__proto__);
+			target = utils.getConstructorName(Object.getPrototypeOf(schema.prototype));
 			if (serviceName === target) {
 				Object.setPrototypeOf(schema, this.ServiceFactory);
 				return schema;