feat: add migrate command to set up OpenNext.js for Existing Next.js apps

[2u841r]

This PR introduces a new CLI workflow that automates the 10+ step migration process for existing Next.js applications moving to OpenNext.js for Cloudflare.

What’s included

• Adds support for:

  npx opennextjs-cloudflare migrate
  

• Automatically generates or updates all required files for Cloudflare deployment:

  • wrangler.jsonc
  • open-next.config.ts
  • .dev.vars
  • Next.js configuration updates
  • Package.json scripts (dev, deploy, etc.)

• Detects whether the project uses the Edge runtime and configures accordingly.

• Provides an interactive package manager selector with keyboard navigation:

  • npm
  • pnpm
  • yarn
  • bun
  • deno

• Performs a full end-to-end setup with zero manual steps.

Why this is useful

The existing migration guide requires following more than 10 manual steps. This flow automates the entire process, reducing setup time from several minutes to just a few seconds.
It ensures consistency, prevents misconfiguration, and improves the onboarding experience for developers migrating their existing projects.

Notes

• This PR only affects the CLI workflow and does not change the underlying runtime.
• Documentation can later include this automated command as the recommended approach for existing app migration.

[changeset-bot]

🦋 Changeset detected

Latest commit: e7b6473

The changes in this PR will be included in the next version bump.

This PR includes changesets to release 1 package

Name	Type
@opennextjs/cloudflare	Minor

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[vicb]

That's something that we already do, see https://github.com/opennextjs/opennextjs-cloudflare/tree/main/packages/cloudflare/templates

[2u841r]

 "services": [
    {
      "binding": "WORKER_SELF_REFERENCE",
      // The service should match the "name" of your worker
      "service": "my-app",
    },
  ],

missing in templates/wrangler.jsonc
also- comments/explanation only for r2_buckets, not other keys.

while in docs comments for almost all keys/values + "services" key is there.

[vicb]

Thanks for the PR.

Definitely a good idea but the implementation needs some work.

(I'll comment further later)

[2u841r]

Thanks for the PR.

Definitely a good idea but the implementation needs some work.

(I'll comment further later)

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• Allow edits by maintainers

Thanks for the feedback!
I’ve done everything I could from my side — feel free to adjust or rewrite anything as you think best.