Streaming & Platform events

As of 2.4.0, ts-force support streaming and platform events, via the new Streaming class!

Push Topics (Steaming API)

The Streaming class has two "subscribe" methods for listening to push topics:

• subscribeToTopic: Provides raw data. Does NOT map resulting data to an generated class SObject
• subscribeToTopicMapped: Maps returned data to a generated class SObject (type provided in first parameter)

Live Code Playground

let stream = new Streaming();
await stream.connect();

// sObject mapping
await stream.subscribeToTopicMapped(
    Account,                      // generated SObject static
    'MyTopic',                    // topic name to subscribe to
    e => {                        // on event callback
        let acc = e.data.sObject;
        console.log(acc.name);
    }
);

Tip: Add PushTopic to your ts-force-config to create topics from code:

let topic = new PushTopic({
    name: 'MyTopic',
    notifyForOperationCreate: true,
    description: 'for unit test',
    apiVersion: DEFAULT_CONFIG.version,
    query: buildQuery(Account, f => (
        {
            select: [
                ...f.select('id', 'name', 'active'),
            ]
        }
    ))
});
await topic.insert();

Platform Events

Platform events work similar to PushTopics but instead you listen using subscribeToEvent<T>.

Automatic mapping to a Platform event generated object is not yet supported (coming soon), but in the meantime you can define the resulting type via the <T> parameterized interface.

Disconnect / Unsubscribing

It is important to call disconnect() or unsubscribe with you are done:

await stream.unsubscribe('MyTopic', 'topic'); //unsubscribes from `/topic/MyTopic`
await stream.unsubscribe('MyEvent__e', 'event'); //unsubscribes from `/event/MyEvent__e`
await stream.disconnect();                    //unsubscribes from all open subscriptions and closes client connection

Using with Node

We are using the to manage subscriptions. In order for this libary to run on node, you must polyfill it.

1. npm install -s cometd-nodejs-client
2. Before you attempt to connect your client, run: require('cometd-nodejs-client').adapt();