diff --git a/src/util/cache.ts b/src/util/cache.ts
index c3be7a26c..61fa1a7ba 100644
--- a/src/util/cache.ts
+++ b/src/util/cache.ts
@@ -10,9 +10,14 @@ export interface CacheData {
   members: Collection<string, Member>;
   unavailableGuilds: Collection<string, number>;
   presences: Collection<string, PresenceUpdatePayload>;
-  // TODO: The type Collection's second provided generic [function] should have a definite shape.
-  // deno-lint-ignore ban-types
-  fetchAllMembersProcessingRequests: Collection<string, Function>;
+  fetchAllMembersProcessingRequests: Collection<
+    string,
+    (
+      value:
+        | Collection<string, Member>
+        | PromiseLike<Collection<string, Member>>,
+    ) => void
+  >;
   executedSlashCommands: Collection<string, string>;
 }
 
diff --git a/src/ws/shard_manager.ts b/src/ws/shard_manager.ts
index 4692632f4..4d92625fa 100644
--- a/src/ws/shard_manager.ts
+++ b/src/ws/shard_manager.ts
@@ -1,5 +1,6 @@
 import { controllers } from "../api/controllers/mod.ts";
 import { Guild } from "../api/structures/guild.ts";
+import { Member } from "../api/structures/mod.ts";
 import { eventHandlers, IdentifyPayload } from "../bot.ts";
 import {
   DiscordBotGatewayData,
@@ -8,6 +9,7 @@ import {
   GatewayOpcode,
 } from "../types/mod.ts";
 import { cache } from "../util/cache.ts";
+import { Collection } from "../util/collection.ts";
 import { BotStatusRequest, delay } from "../util/utils.ts";
 import {
   botGatewayStatusRequest,
@@ -90,9 +92,9 @@ export async function handleDiscordPayload(
 
 export function requestAllMembers(
   guild: Guild,
-  // TODO: The parameter "resolve" should have a "stronger" type.
-  // deno-lint-ignore ban-types
-  resolve: Function,
+  resolve: (
+    value: Collection<string, Member> | PromiseLike<Collection<string, Member>>,
+  ) => void,
   options?: FetchMembersOptions,
 ) {
   const nonce = `${guild.id}-${Date.now()}`;