create an open-next.config.ts file for the user in case one is not already present

Author: dario-piotrowicz

packages/cloudflare/package.json

@@ -66,7 +66,8 @@
   "dependencies": {
     "@opennextjs/aws": "https://pkg.pr.new/@opennextjs/aws@678",
     "ts-morph": "catalog:",
-    "@dotenvx/dotenvx": "catalog:"
+    "@dotenvx/dotenvx": "catalog:",
+    "enquirer": "^2.4.1"
   },
   "peerDependencies": {
     "wrangler": "catalog:"

packages/cloudflare/src/cli/build/index.ts

@@ -1,4 +1,4 @@
-import { cpSync } from "node:fs";
+import { cpSync, existsSync } from "node:fs";
 import { createRequire } from "node:module";
 import { dirname, join } from "node:path";
 
@@ -11,6 +11,7 @@ import * as buildHelper from "@opennextjs/aws/build/helper.js";
 import { printHeader, showWarningOnWindows } from "@opennextjs/aws/build/utils.js";
 import logger from "@opennextjs/aws/logger.js";
 import type { OpenNextConfig } from "@opennextjs/aws/types/open-next.js";
+import Enquirer from "enquirer";
 
 import type { ProjectOptions } from "../config";
 import { containsDotNextDir, getConfig } from "../config";
@@ -34,6 +35,8 @@ export async function build(projectOpts: ProjectOptions): Promise<void> {
   const require = createRequire(import.meta.url);
   const openNextDistDir = dirname(require.resolve("@opennextjs/aws/index.js"));
 
+  await createOpenNextConfigIfNotExistent(baseDir);
+
   const { config, buildDir } = await compileOpenNextConfig(baseDir);
 
   ensureCloudflareConfig(config);
@@ -94,6 +97,34 @@ export async function build(projectOpts: ProjectOptions): Promise<void> {
   logger.info("OpenNext build complete.");
 }
 
+/**
+ * Creates a `open-next.config.ts` file for the user if it doesn't exist, but only after getting the user's confirmation.
+ *
+ * If the users refuses an error is thrown (since the file is mandatory).
+ *
+ * @param baseDir the Next.js app root folder
+ */
+async function createOpenNextConfigIfNotExistent(baseDir: string): Promise<void> {
+  const openNextConfigPath = join(baseDir, "open-next.config.ts");
+
+  if (!existsSync(openNextConfigPath)) {
+    const questionName = "create-open-next-config";
+    const answer = (
+      (await Enquirer.prompt({
+        name: "create-open-next-config",
+        message: "Missing required `open-next.config.ts` file, do you want to create one?",
+        type: "confirm",
+        initial: "y",
+      })) as { [questionName]: boolean }
+    )[questionName];
+    if (!answer) {
+      throw new Error("A `open-next.config.ts` file is mandatory, aborting!");
+    }
+
+    cpSync(`${import.meta.dirname}/templates/defaults/open-next.config.ts`, openNextConfigPath);
+  }
+}
+
 /**
  * Ensures open next is configured for cloudflare.
  *

packages/cloudflare/src/cli/templates/defaults/open-next.config.ts

@@ -0,0 +1,26 @@
+const config = {
+  default: {
+    override: {
+      wrapper: "cloudflare-node",
+      converter: "edge",
+      incrementalCache: "dummy",
+      tagCache: "dummy",
+      queue: "dummy",
+    },
+  },
+
+  middleware: {
+    external: true,
+    override: {
+      wrapper: "cloudflare-edge",
+      converter: "edge",
+      proxyExternalRequest: "fetch",
+    },
+  },
+
+  dangerous: {
+    enableCacheInterception: false,
+  },
+};
+
+export default config;