feat(Channel): add isVoice() (#6297)

src/structures/Channel.js

@@ -9,7 +9,7 @@ let StoreChannel;
 let TextChannel;
 let ThreadChannel;
 let VoiceChannel;
-const { ChannelTypes, ThreadChannelTypes } = require('../util/Constants');
+const { ChannelTypes, ThreadChannelTypes, VoiceBasedChannelTypes } = require('../util/Constants');
 const SnowflakeUtil = require('../util/SnowflakeUtil');
 
 /**
@@ -117,6 +117,15 @@ class Channel extends Base {
     return 'messages' in this;
   }
 
+  /**
+   * Indicates whether this channel is voice-based
+   * ({@link VoiceChannel} or {@link StageChannel}).
+   * @returns {boolean}
+   */
+  isVoice() {
+    return VoiceBasedChannelTypes.includes(this.type);
+  }
+
   /**
    * Indicates whether this channel is a {@link ThreadChannel}.
    * @returns {boolean}

typings/index.d.ts

@@ -354,6 +354,7 @@ export class Channel extends Base {
   public delete(): Promise<Channel>;
   public fetch(force?: boolean): Promise<Channel>;
   public isText(): this is TextBasedChannels;
+  public isVoice(): this is VoiceChannel | StageChannel;
   public isThread(): this is ThreadChannel;
   public toString(): ChannelMention;
 }