Cannot find module 'handler'

[amtzm93]

Hello, I'm submitting the issue cause this error is throwing me in my serverless project after upgrading the serverless-plugin-warmup from version 4.9.0 to 8.0.0.

ERROR	Uncaught Exception 	
{
    "errorType": "Runtime.ImportModuleError",
    "errorMessage": "Error: Cannot find module 'handler'\nRequire stack:\n- /var/runtime/index.mjs",
    "stack": [
        "Runtime.ImportModuleError: Error: Cannot find module 'handler'",
        "Require stack:",
        "- /var/runtime/index.mjs",
        "    at _loadUserApp (file:///var/runtime/index.mjs:951:17)",
        "    at async Object.UserFunction.js.module.exports.load (file:///var/runtime/index.mjs:976:21)",
        "    at async start (file:///var/runtime/index.mjs:1137:23)",
        "    at async file:///var/runtime/index.mjs:1143:1"
    ]
}

I know that serverless-plugin-warmup is working because it created the Warm Up Lambda with its configuration. But after that, all lambda functions can't be found, even if the lambda doesn't have the warm-up event, it can't be found.

Versions:

NodeJs: 16.x
Serverless: ~3.19.0
Serverless Plugin Warmup: ^8.0.0
Serverless Webpack:  5.9.1
Serverless Offline: 9.1.0

The functions configuration declared in the serverless.yml hasn´t been modified because previously the serverless-plugin-warmup every function was working and also, using serverless-offline, the project is working fine.

---

The warmup configuration in serverless.yml

warmup:
    default:
      cleanFolder: false
      name: custom-Name-Lambda
      events:
        - schedule: 'rate(5 minutes)'
      package:
        individually: false
      prewarm: true
      concurrency: 10 # Warm up 10 concurrent instances

[juanjoDiaz]

Hi @amtzm93,

Are you declaring serverless-plugin-warmup after serverless-webpack?

Can you create a sample project to reproduce the issue?
Otherwise there isn't much that I can't do to help....

[juanjoDiaz]

Closing since there was no response. Feel free to reopen if needed.