Fix for member based channel

src/client.ts

@@ -1513,6 +1513,21 @@ export class StreamChat<
     }
     // support channel("messaging", {options})
     if (typeof channelIDOrCustom === 'object') {
+      // Check if the channel already exists.
+      // Only allow 1 channel object per cid
+      for (const cid in this.activeChannels) {
+        if (cid.indexOf(`${channelType}:!members-`) === 0) {
+          const channel = this.activeChannels[cid];
+          const membersStrInExistingChannel = Object.keys(channel.state.members)
+            .sort()
+            .join(',');
+          const membersStr = channelIDOrCustom.members?.sort().join(',');
+          if (membersStrInExistingChannel === membersStr) {
+            return channel;
+          }
+        }
+      }
+
       return new Channel<
         AttachmentType,
         ChannelType,

test/integration/channels.js

@@ -2975,3 +2975,35 @@ describe('Channel - isUpToDate', async () => {
 		).to.be.equal(-1);
 	});
 });
+
+describe('Ensure single channel per cid on client', async () => {
+	it('channel created using id', async () => {
+		const userIdVish = 'vishal';
+		const userIdAmin = 'amin';
+		await createUsers([userIdVish, userIdAmin]);
+
+		const clientVish = await getTestClientForUser(userIdVish);
+		const channelVishId = uuidv4();
+		const channelVish_copy1 = clientVish.channel('messaging', channelVishId);
+		await channelVish_copy1.watch();
+
+		const channelVish_copy2 = clientVish.channel('messaging', channelVishId);
+
+		expect(channelVish_copy1).to.be.equal(channelVish_copy2);
+	});
+	it('channel created using member list', async () => {
+		const userIdVish = 'vishal';
+		const userIdAmin = 'amin';
+		await createUsers([userIdVish, userIdAmin]);
+
+		const clientVish = await getTestClientForUser(userIdVish);
+		const channelVish_copy1 = clientVish.channel('messaging', {
+			members: ['amin', 'vishal'],
+		});
+		await channelVish_copy1.watch();
+		const channelVish_copy2 = clientVish.channel('messaging', {
+			members: ['amin', 'vishal'],
+		});
+		expect(channelVish_copy1).to.be.equal(channelVish_copy2);
+	});
+});