Missing typing for MessageReaction

[itsa-sh]

Please describe the problem you are having in as much detail as possible:

When trying to handle the messageReactionAdd event, the client is inaccessible from the MessageReaction type.

client is being set using Object.assign so I can see it exists, although the type is missing this definition.

Include a reproducible code sample here, if possible:

@Injectable()
export class BotService {
  constructor(
    @Inject(discordConfig.KEY) private readonly config: ConfigType<typeof discordConfig>,
    private readonly moduleRef: ModuleRef,
    private readonly discord: DiscordClient,
    private readonly logger: Logger
  ) {}

  // ...

  async start(): Promise<string> {
      // this.discord.on('ready', this.isReady);
      // this.discord.on('message', this.handleMessage);
      this.discord.on('messageReactionAdd', this.handleMessageReactionAdd);

      return this.discord.login(this.config.key);
  }

  handleMessageReactionAdd = async (reaction: MessageReaction, user: User): Promise<void> => {
    try {
      const guild = reaction.client.guilds.cache.get(this.config.guildId);
      //                       ^ this is the type error ☹️ (my current work around is this.discord, but not ideal)
      const role = guild.roles.cache.get(this.config.memberRoleId);

      await (new GuildMemberRoleManager(guild.member(user))).add(role);

      this.logger.log(`user ${user.tag} accepted the community rules`);
    } catch (e) {
      this.logger.error(e.message);
    }
  }

  // ...
}

Further details:

• discord.js version: ^12.4.1
• Node.js version: 14.12.0
• Operating system: Linux
• Priority this issue should have – Low (Tho, I'm happy to do PR)

Relevant client options:

• partials: none
• gateway intents: none
• other: none

• I have also tested the issue on latest master, commit hash: