refactor: added TextBasedChannels type (#6286)

src/util/Constants.js

@@ -456,6 +456,15 @@ exports.ChannelTypes = createEnum([
   'GUILD_STAGE_VOICE',
 ]);
 
+/**
+ * The channels that are text-based.
+ * * DMChannel
+ * * TextChannel
+ * * NewsChannel
+ * * ThreadChannel
+ * @typedef {DMChannel|TextChannel|NewsChannel|ThreadChannel} TextBasedChannels
+ */
+
 /**
  * The types of channels that are text-based. The available types are:
  * * DM