chatgpt-api/packages/mcp/src/paginate.ts

export interface PaginateInput<T, C> {
  size: number
  handler: (data: {
    cursor?: C
    limit: number
  }) => Promise<{ data: T[]; nextCursor?: C }>
}

export async function paginate<T, C = number>(
  input: PaginateInput<T, C>
): Promise<T[]> {
  const acc: T[] = []
  let cursor: C | undefined

  while (acc.length < input.size) {
    const { data, nextCursor } = await input.handler({
      cursor,
      limit: input.size - acc.length
    })
    acc.push(...data)

    if (nextCursor === undefined || data.length === 0) {
      break
    }

    cursor = nextCursor
  }

  if (acc.length > input.size) {
    acc.length = input.size
  }

  return acc
}