swap ENVIRONMENT_IS_* functions for Utils named exports

src/core/operations/ToMessagePack.mjs

@@ -7,6 +7,7 @@
 import Operation from "../Operation";
 import OperationError from "../errors/OperationError";
 import notepack from "notepack.io";
+import { isWorkerEnvironment } from "../Utils";
 
 /**
  * To MessagePack operation
@@ -35,7 +36,7 @@ class ToMessagePack extends Operation {
      */
     run(input, args) {
         try {
-            if (ENVIRONMENT_IS_WORKER()) {
+            if (isWorkerEnvironment()) {
                 return notepack.encode(input);
             } else {
                 const res = notepack.encode(input);