Custom error becomes normal error

export default class ServerError extends Error {
  issues: IError;

  constructor(message: string, issues: IError) {
    super(message);
    this.name = "ServerError";
    this.issues = issues;

    Object.setPrototypeOf(this, ServerError.prototype);
  }
}

export default class ServerError extends Error {
  issues: IError;

  constructor(message: string, issues: IError) {
    super(message);
    this.name = "ServerError";
    this.issues = issues;

    Object.setPrototypeOf(this, ServerError.prototype);
  }
}

@/lib/db.ts
export const prisma =
  globalForPrisma.prisma ||
  new PrismaClient().$extends({
    query: {
      user: {
        create: ({ args, query }) => {
          if (args.data.username) {
            args.data.usernameUpdatedAt = new Date();
          }

          return query(args);
        },
        update: async ({ args, query }) => {
          if (args.data.username) {
            const oldUser = await prisma.user.findUnique({
              where: args.where,
              select: {
                usernameUpdatedAt: true,
              },
            });

            if (oldUser?.usernameUpdatedAt) {
              const oneWeekAgo = new Date();
              oneWeekAgo.setDate(oneWeekAgo.getDate() - 7);

              if (oldUser.usernameUpdatedAt > oneWeekAgo) {
                // throws the error
                throw new ServerError(
                  "Username can only be updated once a week",
                  {
                    errors: [
                      {
                        code: "user/username-too-frequent",
                        message: "Username can only be updated once a week",
                      },
                    ],
                  },
                );
              }

              args.data.usernameUpdatedAt = new Date();
            } else {
              args.data.usernameUpdatedAt = new Date();
            }
          }

          return query(args);
        },
      },
    },
  });

@/lib/db.ts
export const prisma =
  globalForPrisma.prisma ||
  new PrismaClient().$extends({
    query: {
      user: {
        create: ({ args, query }) => {
          if (args.data.username) {
            args.data.usernameUpdatedAt = new Date();
          }

          return query(args);
        },
        update: async ({ args, query }) => {
          if (args.data.username) {
            const oldUser = await prisma.user.findUnique({
              where: args.where,
              select: {
                usernameUpdatedAt: true,
              },
            });

            if (oldUser?.usernameUpdatedAt) {
              const oneWeekAgo = new Date();
              oneWeekAgo.setDate(oneWeekAgo.getDate() - 7);

              if (oldUser.usernameUpdatedAt > oneWeekAgo) {
                // throws the error
                throw new ServerError(
                  "Username can only be updated once a week",
                  {
                    errors: [
                      {
                        code: "user/username-too-frequent",
                        message: "Username can only be updated once a week",
                      },
                    ],
                  },
                );
              }

              args.data.usernameUpdatedAt = new Date();
            } else {
              args.data.usernameUpdatedAt = new Date();
            }
          }

          return query(args);
        },
      },
    },
  });