fix(client): Return null to mimic v5 api

Author: Calyhre

packages/client/lib/commands/generic-transformers.spec.ts

@@ -197,10 +197,19 @@ describe('Generic Transformers', () => {
     describe('transformStreamMessagesReply', () => {
         it('with null', () => {
             assert.deepEqual(
-                transformStreamMessagesReply([null]),
-                []
+                transformStreamMessagesReply([null, ['0-0', ['0key', '0value']]]),
+                [null, {
+                    id: '0-0',
+                    message: Object.create(null, {
+                        '0key': {
+                            value: '0value',
+                            configurable: true,
+                            enumerable: true
+                        }
+                    })
+                }]
             );
-        })
+        });
 
         it('with messages', () => {
             assert.deepEqual(
@@ -225,8 +234,8 @@ describe('Generic Transformers', () => {
                     })
                 }]
             );
-        })
-    })
+        });
+    });
 
     describe('transformStreamsMessagesReply', () => {
         it('null', () => {

packages/client/lib/commands/generic-transformers.ts

@@ -92,16 +92,18 @@ export interface StreamMessageReply {
     message: Record<string, RedisCommandArgument>;
 }
 
-export type StreamMessagesReply = Array<StreamMessageReply>;
+export type StreamMessagesReply = Array<StreamMessageReply | null>;
 
 export function transformStreamMessagesReply(reply: Array<any>): StreamMessagesReply {
     const messages = [];
 
-    if (reply[0] === null) {
-        return messages;
-    }
+    for (const tuple of reply) {
+        if (tuple === null) {
+            messages.push(null);
+            continue;
+        }
 
-    for (const [id, message] of reply) {
+        const [id, message] = tuple;
         messages.push({
             id,
             message: transformTuplesReply(message)