PostConfirmation failed with error index.handler is undefined or not exported.

Describe the bug

• amplifyXXXXXXPostConfirmation Lambda index.js and event.js generated in incorrect directory.
• Error occured when call Auth.confirmSignUp aws-amplify API

PostConfirmation failed with error index.handler is undefined or not exported.

Amplify CLI Version 4.17.2

To Reproduce

1. amplify auth update

 What do you want to do? 
Walkthrough all the auth configurations
 Select the authentication/authorization services that you want to use: 
User Sign-Up, Sign-In, connected with AWS IAM controls (Enables per-user Storage features for images or other content, Analytics, and more)
 Allow unauthenticated logins? (Provides scoped down permissions that you can control via AWS IAM) 
Yes
 Do you want to enable 3rd party authentication providers in your identity pool?
No
 Do you want to add User Pool Groups? 
No
 Do you want to add an admin queries API? 
No
 Multifactor authentication (MFA) user login options: 
OFF
 Email based user registration/forgot password: 
Enabled (Requires per-user email entry at registration)
 Please specify an email verification subject: 
Your verification code
 Please specify an email verification message: 
Your verification code is {####}
 Do you want to override the default password policy for this User Pool? 
No
 Specify the app's refresh token expiration period (in days): 
30
 Do you want to specify the user attributes this app can read and write? 
No
 Do you want to enable any of the following capabilities? 
 Do you want to use an OAuth flow? 
No
? Do you want to configure Lambda Triggers for Cognito? 
Yes
? Which triggers do you want to enable for Cognito 
Post Confirmation
? What functionality do you want to use for Post Confirmation 
Create your own module

1. call Auth.signUp aws-amplify API

Expected behavior

• amplifyXXXXXXPostConfirmation Lambda index.js and event.js generated in src directory.
• Success call Auth.confirmSignUp aws-amplify API

Screenshots

Desktop (please complete the following information):

• OS: [Ubuntu]
• Node Version. [v12.14.1]

[spyboost]

@jingxizhang I upgraded to 4.18.1 and it fixed the problem. But I had to do one trick because when I just ran amplify auth update again hoping to just refresh my add to groups function, it didn’t fix the file structure. What I had to do is this:

1. Run amplify auth update
2. When it asked if I want to generate all those post functions I unselected everything.
3. After auth update is done it removed my function.
4. Run amplify auth update again and chose to create add to group function.
5. Now it generated correct directory and file structure.

Hope this helps.

[regenrek]

Hi same here.

amplify function invoke <function> gives

Error: ENOENT: no such file or directory, open 'amplify/backend/function/apiPostConfirmation/src/event.json'

It seems that the lib is looking for event.json and index.js inside the src directory

EDIT:

If you move the files accordingly to the following

src
-- add-to-group.js
-- event.json
-- index.js
-- package.json
-- package-lock.json

and alter the index.js function to your needs. For my use case it was like:

exports.handler = (event, context, callback) => {
  const { handler } = require('./add-to-group')
  handler(event, context, callback)
}