Pagination Pipeline Using Aggregate - Mongoose

PaginationPipeline.ts

export const paginationAggregate = ( page: number) => {
  //Max Items
  const limit = 10;
  const skip = (page - 1) * limit;

  return [
    {
      $unwind: '$total',
    },
    {
      $project: {
        items: {
          $slice: [
            '$data',
            skip,
            {
              $ifNull: [limit, '$total.count'],
            },
          ],
        },
        page: {
          $literal: skip / limit + 1,
        },
        hasNextPage: {
          $lt: [{ $multiply: [limit, Number(page)] }, '$total.count'],
        },
        totalPages: {
          $ceil: {
            $divide: ['$total.count', limit],
          },
        },
        totalItems: '$total.count',
      },
    },
  ];
};