fix for trailing slash in versions not redirecting

Author: sbegin0

netlify/edge-functions/redirect-to-latest.ts

@@ -11,22 +11,26 @@ export default async (request: Request, context) => {
     const redirectableSections = ['/', '/about', '/blog', '/get-involved', '/news', '/search'];
     const versionPath = versionMatch[0]; // ex /v1.15
     const remainder = pathname.slice(versionPath.length) || '/';
-    // Check if the remainder starts with a language code
-    const languageCodeMatch = remainder.match(/^\/([a-z]{2})\//);
+    // Check if the remainder starts with an optional leading slash followed by a language code
+    const languageCodeMatch = remainder.match(/^\/?([a-z]{2})(\/|$)/);
     let languageCode: string | null = null;
-    let sectionPath: string = remainder;
+    let remainingPathAfterLang = remainder;
 
     if (languageCodeMatch) {
       languageCode = languageCodeMatch[1];
-      sectionPath = remainder.slice(languageCodeMatch[0].length) || '/'; // slice to remove the leading slash of the language code
+      remainingPathAfterLang = remainder.slice(languageCodeMatch[0].length);
     }
-    // Check if the base section (after removing language code) is redirectable
+    // If there's a language code and no further path, redirect to the homepage with the language code
+    if (languageCode && remainingPathAfterLang === '') {
+      return Response.redirect(new URL(`/latest/${languageCode}/`, url.origin), 301);
+    }
+    // Check if the remaining path (after version and optional language code) starts with a redirectable section
     const shouldRedirect = redirectableSections.some(section =>
-      sectionPath === section || sectionPath.startsWith(`${section}/`) || (section === '/' && sectionPath === ''));
+      remainingPathAfterLang === section || remainingPathAfterLang.startsWith(`${section}/`) || (section === '/' && remainingPathAfterLang === ''));
 
     if (shouldRedirect) {
-      const cleanSectionPath = sectionPath.startsWith('/') ? sectionPath.substring(1) : sectionPath;
-      const newPath = `/latest/${cleanSectionPath}`; // English path doesn't include language code
+      const cleanRemainderPath = remainingPathAfterLang.startsWith('/') ? remainingPathAfterLang.substring(1) : remainingPathAfterLang;
+      const newPath = `/latest/${languageCode ? `${languageCode}/` : ''}${cleanRemainderPath}`;
       return Response.redirect(new URL(newPath, url.origin), 301);
     }
     // For version-specific paths we want to keep, tell Netlify to stop processing this function