Why omit getChannel ?

[k4lu-0p]

Hello everyone,

I'm a beginner on discord-js, especially in bot creation.
I decided to make my bot in typescript and to stay rigorous on the typing.

Below is the code for a slash command called 'join':

  data: new SlashCommandBuilder()
    .setName('join')
    .setDescription('Join a channel')
    .addChannelOption(option => option.setName('channel')
      .setDescription('The channel to join')
      .addChannelTypes(ChannelType.GuildVoice)
      .setRequired(true)
  ),
  async execute(interaction: CommandInteraction) {
    
    const voiceChannel = (interaction.options as CommandInteractionOptionResolver).getChannel('channel');
    
    // ...
}

Here I'm forced to cast the type, which I don't find very clean.
When I searched the definition file for an appropriate type for my interaction, all the types suffixed with Interaction omitted the 'getChannel' method (among others):

export abstract class CommandInteraction<Cached extends CacheType = CacheType> extends BaseInteraction<Cached> {
  public type: InteractionType.ApplicationCommand;
  public get command(): ApplicationCommand | ApplicationCommand<{ guild: GuildResolvable }> | null;
  public options: Omit<
    CommandInteractionOptionResolver<Cached>,
    | 'getMessage'
    | 'getFocused'
    | 'getMentionable'
    | 'getRole'
    | 'getAttachment'
    | 'getNumber'
    | 'getInteger'
    | 'getString'
    | 'getChannel'
    | 'getBoolean'
    | 'getSubcommandGroup'
    | 'getSubcommand'
  >;
  
  // ...

So my question is why?

thank you in advance for your reply 🙏🏻

[Idris1401]

didn't read just saw the code sample but try typing it as ChatInputCommandInteraction

[k4lu-0p]

that's it ! thanks 🙏🏻

[MrMythicalYT]

It is omitted because CommandInteraction is actually for both slash commands and context menu commands. Of course, some of these methods are only functional on one type, while the others are only functional on the other (such as .getNumber() which does not exist on a context menu command, or .getMessage() which does not exist on a slash command). You can type your interaction parameter to something more specific, ChatInputCommandInteraction, so it knows to allow those methods.