fix: srandmember with count argument should return array of strings (#1620)

Co-authored-by: Zihua Li <[email protected]>

Author: joni7777

Diff for: bin/returnTypes.js

@@ -265,7 +265,7 @@ module.exports = {
   sort: "number" | "unknown[]",
   sortRo: "unknown[]",
   spop: (types) => (types.length > 1 ? "string[]" : "string | null"),
-  srandmember: "string | unknown[] | null",
+  srandmember: (types) => (types.length > 1 ? "string[]" : "string | null"),
   srem: "number",
   strlen: "number",
   sunion: "string[]",

Diff for: lib/utils/RedisCommander.ts

@@ -8139,22 +8139,22 @@ interface RedisCommander<Context extends ClientContext = { type: "default" }> {
    */
   srandmember(
     key: RedisKey,
-    callback?: Callback<string | unknown[] | null>
-  ): Result<string | unknown[] | null, Context>;
+    callback?: Callback<string | null>
+  ): Result<string | null, Context>;
   srandmemberBuffer(
     key: RedisKey,
-    callback?: Callback<Buffer | unknown[] | null>
-  ): Result<Buffer | unknown[] | null, Context>;
+    callback?: Callback<Buffer | null>
+  ): Result<Buffer | null, Context>;
   srandmember(
     key: RedisKey,
     count: number | string,
-    callback?: Callback<string | unknown[] | null>
-  ): Result<string | unknown[] | null, Context>;
+    callback?: Callback<string[]>
+  ): Result<string[], Context>;
   srandmemberBuffer(
     key: RedisKey,
     count: number | string,
-    callback?: Callback<Buffer | unknown[] | null>
-  ): Result<Buffer | unknown[] | null, Context>;
+    callback?: Callback<Buffer[]>
+  ): Result<Buffer[], Context>;
 
   /**
    * Remove one or more members from a set

Diff for: test/typing/commands.test-d.ts

@@ -71,6 +71,12 @@ expectType<Promise<number[]>>(
   redis.lpos("key", "element", "RANK", -1, "COUNT", 2)
 );
 
+// SRANDMEMBER
+expectType<Promise<string | null>>(redis.srandmember("key"));
+expectType<Promise<Buffer | null>>(redis.srandmemberBuffer("key"));
+expectType<Promise<string[]>>(redis.srandmember("key", 10));
+expectType<Promise<Buffer[]>>(redis.srandmemberBuffer("key", 10));
+
 // LMISMEMBER
 expectType<Promise<number[]>>(redis.smismember("key", "e1", "e2"));