diff --git a/src/frame/middleware/context/product-groups.js b/src/frame/middleware/context/product-groups.ts
similarity index 63%
rename from src/frame/middleware/context/product-groups.js
rename to src/frame/middleware/context/product-groups.ts
index add02931f8..59f7e282fb 100644
--- a/src/frame/middleware/context/product-groups.js
+++ b/src/frame/middleware/context/product-groups.ts
@@ -1,9 +1,12 @@
-import { getProductGroups } from '#src/products/lib/get-product-groups.js'
-import warmServer from '#src/frame/lib/warm-server.js'
-import { languageKeys } from '#src/languages/lib/languages.js'
-import { allVersionKeys } from '#src/versions/lib/all-versions.js'
+import type { Response, NextFunction } from 'express'
 
-const isHomepage = (path) => {
+import type { ExtendedRequest } from '@/types'
+import { getProductGroups } from '@/products/lib/get-product-groups'
+import warmServer from '@/frame/lib/warm-server.js'
+import { languageKeys } from '@/languages/lib/languages.js'
+import { allVersionKeys } from '@/versions/lib/all-versions.js'
+
+const isHomepage = (path: string) => {
   const split = path.split('/')
   // E.g. `/foo` but not `foo/bar` or `foo/`
   if (split.length === 2 && split[1] && !split[0]) {
@@ -17,7 +20,14 @@ const isHomepage = (path) => {
   return false
 }
 
-export default async function productGroups(req, res, next) {
+export default async function productGroups(
+  req: ExtendedRequest,
+  res: Response,
+  next: NextFunction,
+) {
+  if (!req.context) throw new Error('request is not contextualized')
+  if (!req.pagePath) throw new Error('pagePath is not set on request')
+  if (!req.language) throw new Error('language is not set on request')
   // It's important to use `req.pathPage` instead of `req.path` because
   // the request could be the client-side routing from Next where the URL
   // might be something like `/_next/data/foo/bar.json` which is translated,
@@ -31,7 +41,7 @@ export default async function productGroups(req, res, next) {
   // known versions. Because if it's not valid, any possible
   // use of `{% ifversion ... %}` in Liquid, will throw an error.
   if (isHomepage(req.pagePath) && req.context.currentVersionObj) {
-    const { pages } = await warmServer()
+    const { pages } = await warmServer([])
     req.context.productGroups = await getProductGroups(pages, req.language, req.context)
   }
 
diff --git a/src/frame/middleware/index.ts b/src/frame/middleware/index.ts
index 96c22c8c56..512e5ffdc9 100644
--- a/src/frame/middleware/index.ts
+++ b/src/frame/middleware/index.ts
@@ -47,7 +47,7 @@ import glossaries from './context/glossaries'
 import renderProductName from './context/render-product-name'
 import features from '@/versions/middleware/features.js'
 import productExamples from './context/product-examples'
-import productGroups from './context/product-groups.js'
+import productGroups from './context/product-groups'
 import featuredLinks from '@/landings/middleware/featured-links.js'
 import learningTrack from '@/learning-track/middleware/learning-track.js'
 import next from './next.js'
diff --git a/src/products/lib/all-products.d.ts b/src/products/lib/all-products.d.ts
index 755864c34f..923571e2a9 100644
--- a/src/products/lib/all-products.d.ts
+++ b/src/products/lib/all-products.d.ts
@@ -1,6 +1,6 @@
-import type { Product } from '@/types'
+import type { PageFrontmatter, Product } from '@/types'
 
-export const { data }: Record<string, any>
+export const data: PageFrontmatter
 
 export const productIds: string[]
 
diff --git a/src/products/lib/get-product-groups.js b/src/products/lib/get-product-groups.ts
similarity index 79%
rename from src/products/lib/get-product-groups.js
rename to src/products/lib/get-product-groups.ts
index 242e90525a..916e6a5c23 100644
--- a/src/products/lib/get-product-groups.js
+++ b/src/products/lib/get-product-groups.ts
@@ -1,12 +1,21 @@
 import path from 'path'
 
+import type { Page, ProductGroup, ProductGroupChild, Context } from '@/types'
 import { productMap, data } from './all-products.js'
-import { renderContentWithFallback } from '#src/languages/lib/render-with-fallback.js'
-import removeFPTFromPath from '#src/versions/lib/remove-fpt-from-path.js'
+import { renderContentWithFallback } from '@/languages/lib/render-with-fallback.js'
+import removeFPTFromPath from '@/versions/lib/remove-fpt-from-path.js'
 
-async function getPage(id, lang, pageMap, context) {
+type PageMap = Record<string, Page>
+
+async function getPage(
+  id: string,
+  lang: string,
+  pageMap: PageMap,
+  context: Context,
+): Promise<ProductGroupChild | undefined> {
   const productId = id.split('/')[0]
   const product = productMap[productId]
+
   const external = product.external || false // undefined becomes false
 
   // The href depends. Initially all we have is an `id` which might be
@@ -26,6 +35,8 @@ async function getPage(id, lang, pageMap, context) {
 
   let name = product.name
 
+  if (!context.currentVersion) throw new Error('context.currentVersion is not set')
+
   if (!external) {
     // First we have to find it as a page object based on its ID.
     href = removeFPTFromPath(path.posix.join('/', lang, context.currentVersion, id))
@@ -34,6 +45,7 @@ async function getPage(id, lang, pageMap, context) {
       // fall back it its default version, which is `product.versions[0]`.
       // For example, you're on `/en/enterprise-server@3.1` and you're
       // but a `/foo/bar` is only available in `enterprise-cloud@latest`.
+      if (!product.versions) throw new Error(`Product ${productId} has no versions`)
       href = removeFPTFromPath(path.posix.join('/', lang, product.versions[0], id))
     }
     const page = pageMap[href]
@@ -74,9 +86,13 @@ async function getPage(id, lang, pageMap, context) {
   }
 }
 
-export async function getProductGroups(pageMap, lang, context) {
+export async function getProductGroups(
+  pageMap: PageMap,
+  lang: string,
+  context: Context,
+): Promise<ProductGroup[]> {
   return await Promise.all(
-    data.childGroups.map(async (group) => {
+    data.childGroups!.map(async (group) => {
       return {
         name: group.name,
         icon: group.icon || null,
@@ -84,7 +100,7 @@ export async function getProductGroups(pageMap, lang, context) {
         // Typically the children are product IDs, but we support deeper page paths too
         children: (
           await Promise.all(group.children.map((id) => getPage(id, lang, pageMap, context)))
-        ).filter(Boolean),
+        ).filter(Boolean) as ProductGroupChild[],
       }
     }),
   )
diff --git a/src/types.ts b/src/types.ts
index 9132407ce6..0b5ba99841 100644
--- a/src/types.ts
+++ b/src/types.ts
@@ -14,6 +14,66 @@ export type ExtendedRequest = Request & {
   // Add more properties here as needed
 }
 
+// TODO: Make this type from inference using AJV based on the schema.
+// For now, it's based on `schema` in frame/lib/frontmatter.js
+export type PageFrontmatter = {
+  title: string
+  versions: FrontmatterVersions
+  shortTitle?: string
+  intro?: string
+  product?: string
+  permissions?: string
+  showMiniToc?: boolean
+  miniTocMaxHeadingLevel?: number
+  mapTopic?: boolean
+  hidden?: boolean
+  noEarlyAccessBanner?: boolean
+  earlyAccessToc?: string
+  layout?: string | boolean
+  redirect_from?: string[]
+  allowTitleToDifferFromFilename?: boolean
+  introLinks?: object
+  authors?: string[]
+  examples_source?: string
+  effectiveDate?: string
+
+  featuredLinks?: {
+    gettingStarted?: string[]
+    startHere?: string[]
+    guideCards?: string[]
+    popular?: string[]
+    popularHeading?: string
+    videos?: {
+      title: string
+      href: string
+    }[]
+    videoHeadings?: string
+  }[]
+  changelog?: ChangeLog
+  type?: string
+  topics?: string[]
+  includeGuides?: string[]
+  learningTracks?: string[]
+  beta_product?: boolean
+  product_video?: boolean
+  product_video_transcript?: string
+  interactive?: boolean
+  communityRedirect?: {
+    name: string
+    href: string
+  }
+  defaultPlatform?: 'mac' | 'windows' | 'linux'
+  defaultTool?: string
+  childGroups?: ChildGroup[]
+}
+
+export type ChildGroup = {
+  name: string
+  octicon: string
+  children: string[]
+  icon?: string
+}
+
 export type Product = {
   id: string
   name: string
@@ -23,6 +83,7 @@ export type Product = {
   wip?: boolean
   hidden?: boolean
   versions?: string[]
+  external?: boolean
 }
 
 type ProductMap = {
@@ -95,6 +156,21 @@ export type Context = {
   currentProductName?: string
   productCommunityExamples?: ProductExample[]
   productUserExamples?: ProductExample[]
+  productGroups?: ProductGroup[]
+}
+
+export type ProductGroup = {
+  name: string
+  icon: string | null
+  octicon: string | null
+  children: ProductGroupChild[]
+}
+
+export type ProductGroupChild = {
+  id: string
+  name: string
+  href: string
+  external: boolean
 }
 
 export type Glossary = {