Unsupported handler extension for module

[kboek]

In serverless.yml (excerpt for brevity)

plugins:
  - serverless-middleware

custom:
  middleware:
    pre:
      - auth/authorize.handler

In auth/authorize.js

module.exports.handler = async (event, context) => {
  try {
    // authorization happens here
  } catch (e) {
    // error handling
  }
}

When I run sls deploy or sls package, I get "Unsupported handler extension for module ./auth/authorize. Only .js, .jsx, .ts and .tsx are supported"

This happened after upgrading to SLS 4 and serverless-middleware 3.3.0

[juanjoDiaz]

What version were you using before that worked?

Are you sure that the file path is valid?
The error message indicates that there is no file namy in that location with one of the supported extensions.

Maybe you can you create a project to reproduce the issue?

[kboek]

The path is verified and valid; it used to work before with SLS framework version 3.

[kboek]

I now found out that this happens when used in combination with serverless-compose; where I'd run sls deploy from a parent folder for multiple subfolders - each with their own serverless.yml

[juanjoDiaz]

Hi @kboek ,

Interesting... I guess that previously serverless was always executed from the project folder and now it's not.
And that messes up the path resolution.
I'd need to check how they have solved this in the framework itself and port that here.