//works
realm.subscriptions.update(mutableSubs => {
  mutableSubs.add(realm.objects("Task"));
});

//doesn't work
realm.subscriptions.update(mutableSubs => {
  mutableSubs.add(realm.objects(Task));
});

export class Task extends Realm.Object {
  _id!: Realm.BSON.ObjectId;
  description!: string;
  isComplete!: boolean;
  createdAt!: Date;
  userId!: string;

  // To use a class as a Realm object type, define the object schema on the static property "schema".
  static schema = {
    name: 'Task',
    primaryKey: '_id',
    properties: {
      _id: 'objectId',
      description: 'string',
      isComplete: {type: 'bool', default: false},
      createdAt: 'date',
      userId: 'string',
    },
  };
}

Type error:

Argument of type 'Results<Task>' is not assignable to parameter of type 'Results<Task & Object>'.
  Type 'Task' is not assignable to type 'Task & Object'.
    Type 'Task' is not assignable to type 'Object'.
      Types of property 'addListener' are incompatible.
        Type '(callback: ObjectChangeCallback<Task>) => void' is not assignable to type '(callback: ObjectChangeCallback<Object>) => void'.
          Types of parameters 'callback' and 'callback' are incompatible.
            Types of parameters 'object' and 'object' are incompatible.
              Type 'Task' is not assignable to type 'Object'.
                Types of property 'addListener' are incompatible.
                  Type '(callback: ObjectChangeCallback<Task>) => void' is not assignable to type '(callback: ObjectChangeCallback<Object>) => void'.
                    Types of parameters 'callback' and 'callback' are incompatible.
                      Types of parameters 'changes' and 'changes' are incompatible.
                        Type 'ObjectChangeSet<Task>' is not assignable to type 'ObjectChangeSet<Object>'.
                          Type 'Object' is missing the following properties from type 'Task': _id, description, isComplete, createdAt, userIdts(2345)