bindings/dart: Do not set NativeChannels.session implicitly

bindings/dart/lib/native_channels.dart

@@ -53,20 +53,12 @@ class NativeChannels {
   // Cache of open files.
   static final _files = FileCache();
 
-  /// Provides the Session instance, to be used in file operations.
-  /// [session] is the instance used in the OuiSync app for accessing the repository.
-  ///
-  /// This methoid also sets the method handler for the calls
-  /// to and from native implementations.
+  /// Initializes the native channels.
   ///
   /// Important: This method needs to be called when the app starts
   /// to guarantee the callbacks to the native methods works as expected.
-  static void init({Repository? repository}) {
+  static void init() {
     _channel.setMethodCallHandler(_methodHandler);
-
-    if (repository != null) {
-      _repository = repository;
-    }
   }
 
   /// Replaces the current [repository] instance with a new one.
@@ -76,7 +68,7 @@ class NativeChannels {
   /// required operation.
   ///
   /// [repository] is the current repository in the app.
-  static void setRepository(Repository? repository) {
+  static set repository(Repository? repository) {
     for (var file in _files.removeAll()) {
       file.close();
     }

bindings/dart/lib/ouisync_plugin.dart

@@ -23,7 +23,6 @@ export 'bindings.dart'
         PeerSource,
         PeerStateKind,
         SessionKind;
-export 'native_channels.dart' show NativeChannels;
 
 const bool debugTrace = false;
 
@@ -35,9 +34,7 @@ class Session {
   String? _mountPoint;
 
   Session._(this._client)
-      : _networkSubscription = Subscription(_client, "network", null) {
-    NativeChannels.session = this;
-  }
+      : _networkSubscription = Subscription(_client, "network", null);
 
   /// Creates a new session in this process.
   /// [configPath] is a path to a directory where configuration files shall be stored. If it
@@ -238,10 +235,6 @@ class Session {
       return 0;
     }
 
-    if (NativeChannels.session?._client.isClosed ?? false) {
-      NativeChannels.session = null;
-    }
-
     return handle;
   }
 }