chore(Threads): general fixup and catch up on features (#5959)

Co-authored-by: Vlad Frangu <kingdgrizzle@gmail.com>

src/managers/GuildChannelManager.js

@@ -3,6 +3,7 @@
 const BaseManager = require('./BaseManager');
 const GuildChannel = require('../structures/GuildChannel');
 const PermissionOverwrites = require('../structures/PermissionOverwrites');
+const ThreadChannel = require('../structures/ThreadChannel');
 const Collection = require('../util/Collection');
 const { ChannelTypes, ThreadChannelTypes } = require('../util/Constants');
 
@@ -36,7 +37,7 @@ class GuildChannelManager extends BaseManager {
 
   /**
    * The cache of this Manager
-   * @type {Collection<Snowflake, GuildChannel>}
+   * @type {Collection<Snowflake, GuildChannel|ThreadChannel>}
    * @name GuildChannelManager#cache
    */
 
@@ -50,27 +51,30 @@ class GuildChannelManager extends BaseManager {
   /**
    * Data that can be resolved to give a Guild Channel object. This can be:
    * * A GuildChannel object
+   * * A ThreadChannel object
    * * A Snowflake
-   * @typedef {GuildChannel|Snowflake} GuildChannelResolvable
+   * @typedef {GuildChannel|ThreadChannel|Snowflake} GuildChannelResolvable
    */
 
   /**
    * Resolves a GuildChannelResolvable to a Channel object.
-   * @method resolve
-   * @memberof GuildChannelManager
-   * @instance
    * @param {GuildChannelResolvable} channel The GuildChannel resolvable to resolve
-   * @returns {?GuildChannel}
+   * @returns {?(GuildChannel|ThreadChannel)}
    */
+  resolve(channel) {
+    if (channel instanceof ThreadChannel) return super.resolve(channel.id);
+    return super.resolve(channel);
+  }
 
   /**
    * Resolves a GuildChannelResolvable to a channel ID string.
-   * @method resolveID
-   * @memberof GuildChannelManager
-   * @instance
    * @param {GuildChannelResolvable} channel The GuildChannel resolvable to resolve
    * @returns {?Snowflake}
    */
+  resolveID(channel) {
+    if (channel instanceof ThreadChannel) return super.resolveID(channel.id);
+    return super.resolveID(channel);
+  }
 
   /**
    * Options used to create a new channel in a guild.