chore(c3): update Next version in the experimental template (#7743)

Author: vicb

.changeset/eleven-dingos-scream.md

@@ -0,0 +1,8 @@
+---
+"create-cloudflare": patch
+---
+
+Update the Next.js experimental template
+
+- Use create-next-app@^14.2.23
+- Rename wrangler types output to cloudflare-env.d.ts

packages/create-cloudflare/e2e-tests/frameworks.test.ts

@@ -182,7 +182,7 @@ function getFrameworkTests(opts: {
 			next: {
 				testCommitMessage: false,
 				verifyBuildCfTypes: {
-					outputFile: "env.d.ts",
+					outputFile: "cloudflare-env.d.ts",
 					envInterfaceName: "CloudflareEnv",
 				},
 				verifyPreview: {

packages/create-cloudflare/templates-experimental/next/c3.ts

@@ -36,7 +36,7 @@ export default {
 	// TODO: here we need to specify a version of create-next-app which is different from the
 	//       standard one used in the stable Next.js template, that's because our open-next adapter
 	//       is not yet fully ready for Next.js 15, once it is we should remove the following
-	frameworkCliPinnedVersion: "14.2.5",
+	frameworkCliPinnedVersion: "^14.2.23",
 	platform: "workers",
 	displayName: "Next.js (using Node.js compat + Workers Assets)",
 	path: "templates-experimental/next",
@@ -49,7 +49,7 @@ export default {
 		scripts: {
 			deploy: `opennextjs-cloudflare && wrangler deploy`,
 			preview: `opennextjs-cloudflare && wrangler dev`,
-			"cf-typegen": `wrangler types --env-interface CloudflareEnv env.d.ts`,
+			"cf-typegen": `wrangler types --env-interface CloudflareEnv cloudflare-env.d.ts`,
 		},
 	}),
 	devScript: "dev",

packages/create-cloudflare/templates-experimental/next/templates/cloudflare-env.d.ts

@@ -0,0 +1,5 @@
+// Generated by Wrangler
+// by running `wrangler types --env-interface CloudflareEnv cloudflare-env.d.ts`
+
+interface CloudflareEnv {
+}