[BUG]: error when preloading dd-trace and importing cloudflare package

[dnalborczyk]

Tracer Version(s)

5.65.0

Node.js Version(s)

22.19.0

Bug Report

this issue occurs when importing the cloudflare package with node.js.

Reproduction Code

package.json

{
  "name": "datadog-cloudflare-repro",
  "type": "module",
  "dependencies": {
    "cloudflare": "5.0.0",
    "dd-trace": "5.65.0"
  }
}

index.js

import Cloudflare from 'cloudflare'

console.log(typeof Cloudflare)

shell

# failure
node --import dd-trace/initialize.mjs index.js

# works
node index.js

Error Logs

file:///datadog-cloudflare-repro/node_modules/cloudflare/_shims/registry.mjs:17
        throw new Error(`you must \`import 'cloudflare/shims/${shims.kind}'\` before importing anything else from cloudflare`);
              ^

Error: you must `import 'cloudflare/shims/node'` before importing anything else from cloudflare
    at Module.setShims (file:///datadog-cloudflare-repro/node_modules/cloudflare/_shims/registry.mjs:17:15)
    at init (file:///datadog-cloudflare-repro/node_modules/cloudflare/_shims/index.mjs:7:26)
    at file:///datadog-cloudflare-repro/node_modules/cloudflare/core.mjs:17:1
    at ModuleJob.run (node:internal/modules/esm/module_job:371:25)
    at async onImport.tracePromise.__proto__ (node:internal/modules/esm/loader:683:26)
    at async asyncRunEntryPointWithESMLoader (node:internal/modules/run_main:101:5)

Tracer Config

No response

Operating System

Darwin Daniels-MacBook-Pro.local 24.6.0 Darwin Kernel Version 24.6.0: Mon Jul 14 11:30:30 PDT 2025; root:xnu-11417.140.69~1/RELEASE_ARM64_T6020 arm64

Bundling

No Bundling

[BridgeAR]

@jasnell do you mind taking a look? I judging by the error message it seems like something is off with the detection of that? We do not load any cloudflare packages.

[BridgeAR]

@dnalborczyk could you please open an issue in the cloudflare repository? Just looking at the error message it seems like the detection is not that robust in the implementation and would best be resolved on cloudflare's side :)