Using child processes messes source-maps

[sajithneyo]

Hi,

I used serverless-offline:5.12.1 until recently and upgraded to 6.4.0. As that version has a problem with re-compilng JS correctly I added useChildProcesses: true so when I change the code, the change reflects in dev server. But I noticed when errors are thrown, the error includes line numbers in thousands. That means the source-map is not working correctly, So I changed useChildProcesses: false and the errors give correct line numbers. But the problem is hot reloading does not work.

bellow line shows the type of error message lines I get with 6.4.0 with useChildProcesses: true

\\build\\service\\index.js:131133:15

bellow is my serverless.yml settings for serverless-offline

serverless-offline:
        prefix: verification-service
        printOutput: true
        noPrependStageInUrl: true
        useChildProcesses: true

plugins:

plugins:
    - serverless-webpack
    - serverless-offline
    - serverless-stack-output
    - serverless-iam-roles-per-function
    - serverless-domain-manager
    - serverless-aws-documentation

the expected behaviour is bellow, (ex; using useChildProcesses: false with 6.4.0)

build\\service\\webpack:\\verification-service.ts:205:23

clearly there's a difference in compiled files as seen in those outputs.

Environment

• serverless version: 1.74.1
• serverless-offline version: 6.4.0
• node.js version: 12.17.0
• OS: Windows 10

Is there any solution to this?

[sajithneyo]

Solved the issue with adding import 'source-map-support/register'; into index.ts (where I export the functions)