Couchbase lite Swift Sample Code is out of date

import CouchbaseLiteSwift

@main

struct MyApp {

    static func main() {

// Get the database (and create it if it doesn’t exist).

let database: Database

do {

    database = try Database(name: "mydb")

} catch {

    fatalError("Error opening database")

}

Database.log.console.domains = .all 

Database.log.console.level = .verbose 

// Create a new document (i.e. a record) in the database.

let mutableDoc = MutableDocument()

    .setFloat(2.0, forKey: "version")

    .setString("SDK", forKey: "type")

let collection: Collection

do {

 collection =  try database.createCollection(name:"_default",scope: "_default");

} catch {

    fatalError("Error create collection")

}

// Save it to the database.

do {

    try collection.save(document:mutableDoc)

} catch {

    fatalError("Error saving document")

}

print("Created document id type \(mutableDoc.id)? with type = \(mutableDoc.string(forKey: "type")!)")

let existing_doc:Document?

do{

   existing_doc = try collection.document(id: mutableDoc.id)

} catch{

    fatalError("failed to get document")

}

// Update a document.

if let mutableDoc = existing_doc?.toMutable() {

    mutableDoc.setString("Swift", forKey: "language")

    do {

        try collection.save(document:mutableDoc)

        let document = try collection.document(id: mutableDoc.id)!

        // Log the document ID (generated by the database)

        // and properties

        print("Updated document id \(document.id), adding language \(document.string(forKey: "language")!)")

    } catch {

        fatalError("Error updating document")

    }

}

// Create a query to fetch documents of type SDK.

print("Querying Documents of type=SDK")

let query = QueryBuilder

    .select(SelectResult.all())

    .from(DataSource.collection(collection))

    .where(Expression.property("type").equalTo(Expression.string("SDK")))

// Run the query.

do {

    let result = try query.execute()

    print("Number of rows :: \(result.allResults().count)")

} catch {

    fatalError("Error running the query")

}

    // Create replicators to push and pull changes to and from the cloud.

    let targetEndpoint = URLEndpoint(url: URL(string: "ws://localhost:4984/traveldb")!)

    var replConfig = ReplicatorConfiguration(target: targetEndpoint)

    replConfig.addCollection(collection)

    replConfig.replicatorType = .pushAndPull

    // Add authentication.

    replConfig.authenticator = BasicAuthenticator(username: "sgwuser1", password: "passwordstring")

    // Create replicator (make sure to add an instance or static variable named replicator)

    let replicator = Replicator(config: replConfig)

    // Listen to replicator change events.

    replicator.addChangeListener { (change) in

         print("Error code")

        if let error = change.status.error as NSError? {

            print("Error code :: \(error.code)")

        }

    }

    // Start replication.

        replicator.start()

    var limit = 0

    while (true){

    if(replicator.status.activity != Replicator.ActivityLevel.stopped)

    {

        limit = limit + 1

    }

    if (replicator.status.activity == Replicator.ActivityLevel.stopped && limit > 0 ){

        break;

        }

    }

    replicator.stop();

    }

}