ref

dart/lib/src/transport/encode.dart

@@ -1,7 +1,7 @@
 import 'dart:io';
 
 /// Encodes the body using Gzip compression
-void compressBody(List<int> body, Map<String, String> headers) {
+List<int> compressBody(List<int> body, Map<String, String> headers) {
   headers['Content-Encoding'] = 'gzip';
-  body = gzip.encode(body);
+  return gzip.encode(body);
 }

dart/lib/src/transport/noop_encode.dart

@@ -1,2 +1,2 @@
 /// gzip compression is not available on browser
-void compressBody(List<int> body, Map<String, String> headers) {}
+List<int> compressBody(List<int> body, Map<String, String> headers) => body;

dart/lib/src/transport/transport.dart

@@ -8,8 +8,6 @@ import '../protocol.dart';
 import '../sentry_options.dart';
 import 'noop_encode.dart' if (dart.library.io) 'encode.dart';
 
-typedef BodyEncoder = Function(List<int> body, Map<String, String> headers);
-
 /// A transport is in charge of sending the event to the Sentry server.
 class Transport {
   final SentryOptions _options;
@@ -68,7 +66,7 @@ class Transport {
     // gzip compression is not available on browser
     var body = utf8.encode(json.encode(data));
     if (compressPayload) {
-      compressBody(body, headers);
+      body = compressBody(body, headers);
     }
     return body;
   }