Cannot find package ‘@aws-sdk/client-cognito-identity-provider

Getting a very strange error with AWS Cognito provider.
I stepped away from our back-end Node JS repo for a few weeks, and suddenly our sign-in endpoint is no longer working.

{
"message": {
    "errorType": "Error",
    "errorMessage": "Cannot find package '@aws-sdk/client-cognito-identity-provider' imported from /var/task/index.mjs",
    "trace": [
        "Error [ERR_MODULE_NOT_FOUND]: Cannot find package '@aws-sdk/client-cognito-identity-provider' imported from /var/task/index.mjs",
        "    at new NodeError (internal/errors.js:322:7)",
        "    at packageResolve (internal/modules/esm/resolve.js:732:9)",
        "    at moduleResolve (internal/modules/esm/resolve.js:773:18)",
        "    at Loader.defaultResolve [as _resolve] (internal/modules/esm/resolve.js:887:11)",
        "    at Loader.resolve (internal/modules/esm/loader.js:89:40)",
        "    at Loader.getModuleJob (internal/modules/esm/loader.js:242:28)",
        "    at ModuleWrap.<anonymous> (internal/modules/esm/module_job.js:76:40)",
        "    at link (internal/modules/esm/module_job.js:75:36)",
        "    at process.runNextTicks [as _tickCallback] (internal/process/task_queues.js:60:5)",
        "    at /var/runtime/deasync.js:23:15"
    ]
},
"error": null

Situation

  • no other team mates using the same repo, are getting this
  • no code changes were made on my end
  • going back to a branch made weeks ago that was working fine, is also throwing this error.

What I’ve tried

  • tried with Node versions 22, 20, and 14.

  • tried updating that particular package, and all the other AWS packages we use.

  • deleted and reinstalled the node_modules

  • Completely deleted and re-cloned the repo

Extra Notes

This error only shows in Postman when I hit the sign-in endpoint. There are no errors when starting the server. This error does not show in my console, only in Postman.