Update doctest client with latest v4 release (#2844)

packages/json/lib/commands/MSET.ts

@@ -0,0 +1,28 @@
+import { RedisJSON, transformRedisJsonArgument } from '.';
+import { RedisCommandArgument } from '@redis/client/dist/lib/commands';
+
+export const FIRST_KEY_INDEX = 1;
+
+interface JsonMSetItem {
+    key: RedisCommandArgument;
+    path: RedisCommandArgument;
+    value: RedisJSON;
+}
+
+export function transformArguments(items: Array<JsonMSetItem>): Array<string> {
+  
+    const args = new Array(1 + items.length * 3);
+    args[0] = 'JSON.MSET';
+
+    let argsIndex = 1;
+    for (let i = 0; i < items.length; i++) {
+        const item = items[i];
+        args[argsIndex++] = item.key;
+        args[argsIndex++] = item.path;
+        args[argsIndex++] = transformRedisJsonArgument(item.value);
+    }
+
+    return args;
+}
+
+export declare function transformReply(): 'OK';