fix(llms-txt): resolve type errors in middleware and utils

Fix strict TypeScript errors: add fallback for split()[0] possibly
undefined, narrow regex match group types, use non-null assertions
for Record lookups after in-check, and use Nuxt's auto-generated
Packument type instead of @npm/types import.

Author: lukeocodes

server/middleware/llms-txt.ts

@@ -26,7 +26,7 @@ const CACHE_HEADER = 's-maxage=3600, stale-while-revalidate=86400'
  * - /package/@:org/:name/v/:version/llms_full.txt (scoped, versioned, full)
  */
 export default defineEventHandler(async event => {
-  const path = event.path.split('?')[0]
+  const path = event.path.split('?')[0] ?? '/'
 
   if (!path.endsWith('/llms.txt') && !path.endsWith('/llms_full.txt')) return
 
@@ -70,12 +70,12 @@ export default defineEventHandler(async event => {
     // Versioned path
     if (inner.startsWith('@')) {
       const match = inner.match(/^(@[^/]+\/[^/]+)\/v\/(.+)$/)
-      if (!match) return
+      if (!match?.[1] || !match[2]) return
       rawPackageName = match[1]
       rawVersion = match[2]
     } else {
       const match = inner.match(/^([^/]+)\/v\/(.+)$/)
-      if (!match) return
+      if (!match?.[1] || !match[2]) return
       rawPackageName = match[1]
       rawVersion = match[2]
     }

server/utils/llms-txt.ts

@@ -1,4 +1,3 @@
-import type { Packument } from '@npm/types'
 import type { JsDelivrFileNode, AgentFile, LlmsTxtResult } from '#shared/types'
 import { NPM_MISSING_README_SENTINEL, NPM_REGISTRY } from '#shared/utils/constants'
 
@@ -72,11 +71,12 @@ export function discoverAgentFiles(files: JsDelivrFileNode[]): string[] {
  * Get the display name for an agent file path.
  */
 function getDisplayName(filePath: string): string {
-  if (filePath in ROOT_AGENT_FILES) return ROOT_AGENT_FILES[filePath]
-  if (filePath in DIRECTORY_AGENT_FILES) return DIRECTORY_AGENT_FILES[filePath]
+  if (filePath in ROOT_AGENT_FILES) return ROOT_AGENT_FILES[filePath]!
+  if (filePath in DIRECTORY_AGENT_FILES) return DIRECTORY_AGENT_FILES[filePath]!
 
   for (const [dirPath, displayName] of Object.entries(RULE_DIRECTORIES)) {
-    if (filePath.startsWith(`${dirPath}/`)) return `${displayName}: ${filePath.split('/').pop()}`
+    if (filePath.startsWith(`${dirPath}/`))
+      return `${displayName}: ${filePath.split('/').pop() ?? filePath}`
   }
 
   return filePath
@@ -181,7 +181,10 @@ async function fetchReadmeFromCdn(packageName: string, version: string): Promise
 }
 
 /** Extract README from packument data */
-function getReadmeFromPackument(packageData: Packument, requestedVersion?: string): string | null {
+function getReadmeFromPackument(
+  packageData: Awaited<ReturnType<typeof fetchNpmPackage>>,
+  requestedVersion?: string,
+): string | null {
   const readme = requestedVersion
     ? packageData.versions[requestedVersion]?.readme
     : packageData.readme