Error: Cannot use namespace 'Observable' as a type. (apollo-link, typescript) - node.js

Question

i am trying to create a graphql subcription with hasura, follow this example: Boilerplate to test GraphQL subscriptions using nodejs, just added types for trypescript, if i run it directly with nodemon works fine, and gets me the data i want but if try to make a tsc i get the following errors:
and my code for the subscription is:
/***** Setup a GraphQL subscription observable ******************************/
import { DocumentNode, execute, GraphQLRequest } from 'apollo-link';
import { WebSocketLink } from 'apollo-link-ws';
import { SubscriptionClient } from 'subscriptions-transport-ws';
import ws from 'ws';
const getWsClient = (wsURL: string) => {
const client = new SubscriptionClient(
wsURL, {
reconnect: true, connectionParams: () => {
return {
headers: {
'x-hasura-admin-secret': process.env.HASURA_GRAPHQL_ADMIN_SECRET
}
}
}
}, ws
);
return client;
};
// wsURL: GraphQL endpoint
// query: GraphQL query (use gql`` from the 'graphql-tag' library)
// variables: Query variables object
const createSubscription = (wsURL: string, query: DocumentNode, variables: Record<string, any>) => {
const link = new WebSocketLink(getWsClient(wsURL));
return execute(link, { query, variables } as GraphQLRequest);
};
export default createSubscription
I already updated typescript for
"nodemon": "^2.0.15",
"ts-node": "^10.2.1",
"typescript": "^4.4.2"
does any one have any ideas?
Thanks in advance.