[BUG] TS failure in built bucket-cache-purge.js file with worker-types

[hitsthings]

Describe the bug

Running wrangler types --env-interface CloudflareEnv types/cloudflare-env.d.ts creates the *.d.ts which includes

export abstract class DurableObject<Env = Cloudflare.Env, Props = {}> implements Rpc.DurableObjectBranded {
        [Rpc.__DURABLE_OBJECT_BRAND]: never;
        protected ctx: DurableObjectState<Props>;
        protected env: Env;
        ...

Building the OpenNextJS code creates /.open-next/.build/durable-objects/bucket-cache-purge.js which includes

// node_modules/@opennextjs/cloudflare/dist/api/durable-objects/bucket-cache-purge.js
var DEFAULT_BUFFER_TIME_IN_SECONDS = 5;
var MAX_NUMBER_OF_TAGS_PER_PURGE = 100;
var BucketCachePurge = class extends DurableObject {

The build fails because of

.open-next/.build/durable-objects/bucket-cache-purge.js:116:5
Type error: Property 'ctx' of exported anonymous class type may not be private or protected.

  114 | var DEFAULT_BUFFER_TIME_IN_SECONDS = 5;
  115 | var MAX_NUMBER_OF_TAGS_PER_PURGE = 100;
> 116 | var BucketCachePurge = class extends DurableObject {
      |     ^
  117 |   bufferTimeInSeconds;
  118 |   constructor(state, env) {
  119 |     super(state, env);
Next.js build worker exited with code: 1 and signal: null

Steps to reproduce

1. Generate types: wrangler types --env-interface CloudflareEnv types/cloudflare-env.d.ts
2. Run opennextjs-cloudflare build

Expected behavior

Build succeeds.

@opennextjs/cloudflare version

1.19.1

Wrangler version

4.83.0

next info output

> @releasedsoftware/portal@0.1.0 next
> next info

warn  - Failed to fetch latest canary version. (Reason: Failed to get registry from "yarn"..)
      Detected "15.2.8". Visit https://github.com/vercel/next.js/releases.
      Make sure to try the latest canary version (eg.: `npm install next@canary`) to confirm the issue still exists before creating a new issue.

Learn more: https://nextjs.org/docs/messages/opening-an-issue

Operating System:
  Platform: darwin
  Arch: arm64
  Version: Darwin Kernel Version 25.1.0: Mon Oct 20 19:33:00 PDT 2025; root:xnu-12377.41.6~2/RELEASE_ARM64_T6020
  Available memory (MB): 32768
  Available CPU cores: 12
Binaries:
  Node: 24.11.1
  npm: 11.0.0
  Yarn: 4.0.2
  pnpm: 10.14.0
Relevant Packages:
  next: 15.2.8
  eslint-config-next: N/A
  react: 19.2.3
  react-dom: 19.2.3
  typescript: 5.9.2
Next.js Config:
  output: N/A

Additional context

No response

[hitsthings]

On closer inspection, what fails is NODE_ENV=production next build
which is the script called when I run opennextjs-cloudflare build

[hitsthings]

Welp, I'm not sure what I changed, but now it works. The same code is present and opening it in my IDE gives the same warning, but the command line doesn't complain.

[hitsthings]

It still happens when running next build directly, fwiw.