V5 bringing RESP3, Sentinel and TypeMapping to node-redis

RESP3 Support
   - Some commands responses in RESP3 aren't stable yet and therefore return an "untyped" ReplyUnion.
 
Sentinel

TypeMapping

Correctly types Multi commands

Note: some API changes to be further documented in v4-to-v5.md

packages/json/lib/commands/ARRAPPEND.ts

@@ -1,15 +1,27 @@
 import { RedisJSON, transformRedisJsonArgument } from '.';
+import { RedisArgument, NumberReply, ArrayReply, NullReply, Command } from '@redis/client/dist/lib/RESP/types';
 
-export const FIRST_KEY_INDEX = 1;
+export default {
+  FIRST_KEY_INDEX: 1,
+  IS_READ_ONLY: false,
+  transformArguments(
+    key: RedisArgument,
+    path: RedisArgument,
+    json: RedisJSON,
+    ...jsons: Array<RedisJSON>
+  ) {
+    const args = new Array<RedisArgument>(4 + jsons.length);
+    args[0] = 'JSON.ARRAPPEND';
+    args[1] = key;
+    args[2] = path;
+    args[3] = transformRedisJsonArgument(json);
 
-export function transformArguments(key: string, path: string, ...jsons: Array<RedisJSON>): Array<string> {
-    const args = ['JSON.ARRAPPEND', key, path];
-
-    for (const json of jsons) {
-        args.push(transformRedisJsonArgument(json));
+    let argsIndex = 4;
+    for (let i = 0; i < jsons.length; i++) {
+      args[argsIndex++] = transformRedisJsonArgument(jsons[i]);
     }
 
     return args;
-}
-
-export declare function transformReply(): number | Array<number>;
+  },
+  transformReply: undefined as unknown as () => NumberReply | ArrayReply<NumberReply | NullReply>
+} as const satisfies Command;