Fix link checks to npm for packages

Author: weshaggard

eng/common/scripts/Verify-Links.ps1

@@ -120,6 +120,9 @@ function ProcessLink([System.Uri]$linkUri) {
     # See comment in function below for details.
     return ProcessCratesIoLink $linkUri $matches['path']
   }
+  elseif ($linkUri -match '^https?://(www\.)?npmjs\.com/package/.+') {
+    return ProcessNpmLink $linkUri
+  }
   else {
     return ProcessStandardLink $linkUri
   }
@@ -157,6 +160,14 @@ function ProcessCratesIoLink([System.Uri]$linkUri, $path) {
   return $true
 }
 
+function ProcessNpmLink([System.Uri]$linkUri) {
+  # npmjs.com started using Cloudflare which returns 403 and we need to instead check the registry api for existence checks
+  # https://github.com/orgs/community/discussions/174098#discussioncomment-14461226
+  $apiUrl = $linkUri.ToString().Replace("https://www.npmjs.com/package/", "https://registry.npmjs.org/")
+
+  return ProcessStandardLink ([System.Uri]$apiUrl)
+}
+
 function ProcessStandardLink([System.Uri]$linkUri) {
   $headRequestSucceeded = $true
   try {