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

packages/cloudflare/package.json

@@ -32,7 +32,8 @@
   },
   "files": [
     "README.md",
-    "dist"
+    "dist",
+    "templates"
   ],
   "repository": {
     "type": "git",
@@ -73,7 +74,8 @@
     "@opennextjs/aws": "https://pkg.pr.new/@opennextjs/aws@684",
     "glob": "catalog:",
     "rimraf": "catalog:",
-    "ts-morph": "catalog:"
+    "ts-morph": "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";
 
@@ -12,8 +12,10 @@ import { printHeader, showWarningOnWindows } from "@opennextjs/aws/build/utils.j
 import logger from "@opennextjs/aws/logger.js";
 import type { OpenNextConfig } from "@opennextjs/aws/types/open-next.js";
 
+import { getPackageTemplatesDirPath } from "../../utils/get-package-templates-dir-path.js";
 import type { ProjectOptions } from "../config.js";
 import { containsDotNextDir, getConfig } from "../config.js";
+import { askConfirmation } from "../utils/ask-confirmation.js";
 import { bundleServer } from "./bundle-server.js";
 import { compileEnvFiles } from "./open-next/compile-env-files.js";
 import { copyCacheAssets } from "./open-next/copyCacheAssets.js";
@@ -35,6 +37,8 @@ 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(projectOpts);
+
   const { config, buildDir } = await compileOpenNextConfig(baseDir);
 
   ensureCloudflareConfig(config);
@@ -100,6 +104,29 @@ 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 asking for the user's confirmation.
+ *
+ * If the user refuses an error is thrown (since the file is mandatory).
+ *
+ * @param projectOpts The options for the project
+ */
+async function createOpenNextConfigIfNotExistent(projectOpts: ProjectOptions): Promise<void> {
+  const openNextConfigPath = join(projectOpts.sourceDir, "open-next.config.ts");
+
+  if (!existsSync(openNextConfigPath)) {
+    const answer = await askConfirmation(
+      "Missing required `open-next.config.ts` file, do you want to create one?"
+    );
+
+    if (!answer) {
+      throw new Error("The `open-next.config.ts` file is required, aborting!");
+    }
+
+    cpSync(join(getPackageTemplatesDirPath(), "defaults", "open-next.config.ts"), openNextConfigPath);
+  }
+}
+
 /**
  * Ensures open next is configured for cloudflare.
  *
@@ -122,30 +149,32 @@ function ensureCloudflareConfig(config: OpenNextConfig) {
   };
 
   if (Object.values(requirements).some((satisfied) => !satisfied)) {
-    throw new Error(`open-next.config.ts should contain:
-{
-  default: {
-    override: {
-      wrapper: "cloudflare-node",
-      converter: "edge",
-      incrementalCache: "dummy" | function,
-      tagCache: "dummy",
-      queue: "dummy",
-    },
-  },
-
-  middleware: {
-    external: true,
-    override: {
-      wrapper: "cloudflare-edge",
-      converter: "edge",
-      proxyExternalRequest: "fetch",
-    },
-  },
-
-  "dangerous": {
-    "enableCacheInterception": false
-  }
-}`);
+    throw new Error(
+      "The `open-next.config.ts` should have a default export like this:\n\n" +
+        `{
+          default: {
+            override: {
+              wrapper: "cloudflare-node",
+              converter: "edge",
+              incrementalCache: "dummy" | function,
+              tagCache: "dummy",
+              queue: "dummy",
+            },
+          },
+
+          middleware: {
+            external: true,
+            override: {
+              wrapper: "cloudflare-edge",
+              converter: "edge",
+              proxyExternalRequest: "fetch",
+            },
+          },
+
+          "dangerous": {
+            "enableCacheInterception": false
+          },
+        }\n\n`.replace(/^ {8}/gm, "")
+    );
   }
 }

packages/cloudflare/src/cli/utils/ask-confirmation.ts

@@ -0,0 +1,17 @@
+import Enquirer from "enquirer";
+
+export async function askConfirmation(message: string): Promise<boolean> {
+  const questionName = crypto.randomUUID();
+
+  const enquirerAnswersObject = await Enquirer.prompt<Record<string, boolean>>({
+    name: questionName,
+    message,
+    type: "confirm",
+    initial: "y",
+  });
+
+  console.log("");
+
+  const answer = !!enquirerAnswersObject[questionName];
+  return answer;
+}

packages/cloudflare/src/utils/get-package-templates-dir-path.ts

@@ -0,0 +1,12 @@
+import * as path from "node:path";
+
+const templatesDirPath = path.resolve(`${import.meta.dirname}/../../templates`);
+
+/**
+ * Utility for getting the resolved path to the package's templates directory
+ *
+ * @returns the resolved path of the templates directory
+ */
+export function getPackageTemplatesDirPath(): string {
+  return templatesDirPath;
+}

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

@@ -0,0 +1,30 @@
+// default open-next.config.ts file created by @opennextjs/cloudflare
+
+import cache from "@opennextjs/cloudflare/kvCache";
+
+const config = {
+  default: {
+    override: {
+      wrapper: "cloudflare-node",
+      converter: "edge",
+      incrementalCache: async () => cache,
+      tagCache: "dummy",
+      queue: "dummy",
+    },
+  },
+
+  middleware: {
+    external: true,
+    override: {
+      wrapper: "cloudflare-edge",
+      converter: "edge",
+      proxyExternalRequest: "fetch",
+    },
+  },
+
+  dangerous: {
+    enableCacheInterception: false,
+  },
+};
+
+export default config;