diff --git a/lib/cli/context.dart b/lib/cli/context.dart
index 1e2be08..d4aabce 100644
--- a/lib/cli/context.dart
+++ b/lib/cli/context.dart
@@ -14,7 +14,7 @@ import "package:tint/tint.dart";
 part "locale.dart";
 part "paths.dart";
 
-class CliContext implements Disposable {
+class CliContext with Disposable {
   static late final CliContext I;
   static bool _instanced = false;
 
diff --git a/lib/cli/printer/iprinter.dart b/lib/cli/printer/iprinter.dart
index 5085f59..b1c0591 100644
--- a/lib/cli/printer/iprinter.dart
+++ b/lib/cli/printer/iprinter.dart
@@ -2,7 +2,7 @@ import "package:discloud/cli/disposable.dart";
 import "package:discloud/cli/printer/console_printer.dart";
 import "package:discloud/cli/spin/ispin.dart";
 
-abstract interface class const IPrinter() implements Disposable {
+abstract interface class const IPrinter() with Disposable {
   factory console({bool isDebug = true}) => ConsolePrinter(isDebug: isDebug);
 
   ISpin spin({String? text, bool start = true});
diff --git a/lib/services/discloud/api_client.dart b/lib/services/discloud/api_client.dart
index be1f80a..4b25f69 100644
--- a/lib/services/discloud/api_client.dart
+++ b/lib/services/discloud/api_client.dart
@@ -15,7 +15,7 @@ import "package:path/path.dart";
 typedef VoidUploadProgressCallback = void Function(int processed);
 typedef VoidUploadDoneCallback = FutureOr<void> Function();
 
-class DiscloudApiClient implements Disposable {
+class DiscloudApiClient with Disposable {
   static const _apiScheme = "https";
   static const _apiHost = "api.discloud.app";
   static const _apiVersion = 2;
diff --git a/lib/utils/progress.dart b/lib/utils/progress.dart
index 6ac30ad..40513db 100644
--- a/lib/utils/progress.dart
+++ b/lib/utils/progress.dart
@@ -2,15 +2,11 @@ import "package:discloud/extensions/num.dart";
 import "package:discloud/utils/bytes.dart";
 import "package:discloud/utils/formatters.dart";
 
-enum UnitDirection {
+enum UnitDirection(final String symbol) {
   up("↑"),
   down("↓"),
   both("⇅");
 
-  new(this.symbol);
-
-  final String symbol;
-
   @override
   String toString() => symbol;
 }
diff --git a/lib/utils/speed_monitor.dart b/lib/utils/speed_monitor.dart
index e1d50e3..813c6a6 100644
--- a/lib/utils/speed_monitor.dart
+++ b/lib/utils/speed_monitor.dart
@@ -10,7 +10,7 @@ final class _SpeedSample extends LinkedListEntry<_SpeedSample> {
 }
 
 /// A utility class for monitoring processing speed over a sliding time window.
-class SpeedMonitor implements Disposable {
+class SpeedMonitor with Disposable {
   static const double _zero = 0;
 
   /// Creates a [SpeedMonitor]