feat: Add ticker_1000 WebSocket channel (#655)

src/client/WebSocketClient.test.ts

@@ -205,6 +205,22 @@ describe('WebSocketClient', () => {
       ws.connect();
     });
 
+    it('receives typed "ticker" messages from the special "ticker_1000" channel', done => {
+      const channel = {
+        name: WebSocketChannelName.TICKER_1000,
+        product_ids: ['BTC-USD'],
+      };
+
+      const ws = mockWebSocketResponse(done, channel, tickerBTCUSD);
+
+      ws.on(WebSocketEvent.ON_MESSAGE_TICKER, tickerMessage => {
+        expect(tickerMessage.trade_id).toBe(3526965);
+        ws.unsubscribe(channel);
+      });
+
+      ws.connect();
+    });
+
     it('receives typed messages from multiple "matches" channels', done => {
       const channels = [
         {

src/client/WebSocketClient.ts

@@ -22,6 +22,8 @@ export enum WebSocketChannelName {
   STATUS = 'status',
   /** The ticker channel provides real-time price updates every time a match happens. It batches updates in case of cascading matches, greatly reducing bandwidth requirements. */
   TICKER = 'ticker',
+  /** A special version of the ticker channel that only provides a ticker update about every 5 seconds. */
+  TICKER_1000 = 'ticker_1000',
   /** This channel is a version of the full channel that only contains messages that include the authenticated user. Consequently, you need to be authenticated to receive any messages. */
   USER = 'user',
 }