Is it possible to pass a class into isolation or a module?

In Flutter, an Isolate is a separate thread of execution that does not share memory with the main thread. You cannot directly pass a class or object from one isolate to another because they cannot share memory.

However, you can pass serializable data (such as primitives, lists, maps), which can be used to create class instances in another isolate. Data exchange between isolates is usually done through messages via SendPort and ReceivePort.

Example of passing data between isolates:

import 'dart:isolate';

class MyClass {
  final int value;
  MyClass(this.value);

  Map<String, dynamic> toMap() => {'value': value};

  static MyClass fromMap(Map<String, dynamic> map) => MyClass(map['value']);
}

void isolateEntry(SendPort sendPort) {
  final myObject = MyClass(42);
  sendPort.send(myObject.toMap());
}

void main() async {
  final receivePort = ReceivePort();
  await Isolate.spawn(isolateEntry, receivePort.sendPort);

  receivePort.listen((message) {
    final myObject = MyClass.fromMap(message);
    print('Received value: \\${myObject.value}');
  });
}

Thus, a class cannot be passed directly, but data can be passed to reconstruct the object in another isolate.