getNextPage() — supabase Function Reference

Architecture documentation for the getNextPage() function in get-next-page.ts from the supabase codebase.

Function typescript ContentManagement Collections calls 2 called by 1

Entity Profile

ContentManagement→ Collections→ getNextPage() — supabase Function Reference

Dependency Diagram

graph TD
  9cb78d4b_2172_d6ab_70f8_56230d9462ce["getNextPage()"]
  6925281d_d060_1098_fe37_526e0c6321ea["DocPage()"]
  6925281d_d060_1098_fe37_526e0c6321ea -->|calls| 9cb78d4b_2172_d6ab_70f8_56230d9462ce
  aede3fb6_ba0d_36b2_0688_210bdb8ec683["flattenNavItems()"]
  9cb78d4b_2172_d6ab_70f8_56230d9462ce -->|calls| aede3fb6_ba0d_36b2_0688_210bdb8ec683
  d6535fbd_6a76_7688_ffe1_473fd62b482c["normalizeSlug()"]
  9cb78d4b_2172_d6ab_70f8_56230d9462ce -->|calls| d6535fbd_6a76_7688_ffe1_473fd62b482c
  style 9cb78d4b_2172_d6ab_70f8_56230d9462ce fill:#6366f1,stroke:#818cf8,color:#fff

Relationship Graph

Source Code

apps/learn/lib/get-next-page.ts lines 35–82

export function getNextPage(
  currentSlug: string
): { title: string; href: string; description?: string; chapterNumber?: number } | null {
  // Flatten all navigation items
  const allPages = flattenNavItems(courses.items)

  // Normalize the current slug for comparison
  const normalizedCurrentSlug = normalizeSlug(currentSlug)

  // Find the current page index
  const currentIndex = allPages.findIndex((page) => {
    if (!page.href) return false
    const pageSlug = normalizeSlug(page.href)
    return pageSlug === normalizedCurrentSlug
  })

  // If current page not found or it's the last page, return null
  if (currentIndex === -1 || currentIndex === allPages.length - 1) {
    return null
  }

  // Get the next page
  const nextPage = allPages[currentIndex + 1]
  if (!nextPage || !nextPage.href) {
    return null
  }

  // Try to get description and chapterNumber from the doc
  const nextPageSlug = normalizeSlug(nextPage.href)
  const doc = allDocs.find((doc) => normalizeSlug(doc.slugAsParams) === nextPageSlug)
  const description = doc?.description || nextPage.title

  // Get chapterNumber from frontmatter first, then fallback to parsing from title
  // Using type assertion since contentlayer types may need regeneration
  let chapterNumber: number | undefined = (doc as any)?.chapterNumber
  if (!chapterNumber) {
    // Try to extract chapter number from title (e.g., "2: CSS Styling" -> 2)
    const chapterMatch = nextPage.title.match(/^(\d+):/)
    chapterNumber = chapterMatch ? parseInt(chapterMatch[1], 10) : undefined
  }

  return {
    title: nextPage.title,
    href: nextPage.href,
    description,
    chapterNumber,
  }
}