swap ENVIRONMENT_IS_* functions for Utils named exports

src/core/operations/ImageOpacity.mjs

@@ -8,6 +8,7 @@ import Operation from "../Operation";
 import OperationError from "../errors/OperationError";
 import { isImage } from "../lib/FileType";
 import { toBase64 } from "../lib/Base64.mjs";
+import { isWorkerEnvironment } from "../Utils";
 import jimp from "jimp";
 
 /**
@@ -57,7 +58,7 @@ class ImageOpacity extends Operation {
             throw new OperationError(`Error loading image. (${err})`);
         }
         try {
-            if (ENVIRONMENT_IS_WORKER())
+            if (isWorkerEnvironment())
                 self.sendStatusMessage("Changing image opacity...");
             image.opacity(opacity / 100);