Type '"Rules"' is not assignable to type 'PreconditionEntryResolvable'.

export class RulesPrecondition extends Precondition {
  public constructor(context: PieceContext, options: PieceOptions) {
    super(context, {
      ...options,
      name: "Rules",
    });
  }
  public override async messageRun(message: Message) {
    const res = await this.checkUser(message.author.id);
    if (res) return this.ok();
    return this.error({
      message: "You must accept the rules to use this command.",
    });
  }

  private async checkUser(userId: string) {
    const exists = await this.container.client.db.has(`user_${userId}`);
    return exists;
  }
}

declare module "@sapphire/framework" {
  interface SapphireClient {
    db: PetDatabase;
  }
  interface Preconditions {
    Rules: never;
  }
}

export class PingCommand extends Command {
  public constructor(context: Command.Context, options: Command.Options) {
    super(context, {
      ...options,
      name: "ping",
      description: "ping pong",
      preconditions: ["Rules"],
    });
  }
  public async messageRun(message: Message) {
    return message.channel.send(
      `:ping_pong: | Pong! ${this.container.client.ws.ping}ms`
    );
  }
}