Unhandled exception in handler 'index'.

[Hawley-hy]

Are you certain it's a bug?

• Yes, it looks like a bug

Is the issue caused by a plugin?

• It is not a plugin issue

Are you using the latest v3 release?

• Yes, I'm using the latest v3 release

Is there an existing issue for this?

• I have searched existing issues, it hasn't been reported yet

Issue description

I use webpack build my project. the code as bellow that after build.

`// (() => { // webpackBootstrap
// "use strict";

/!!
! ./index.ts !
**/

Object.defineProperty(exports, "__esModule", ({ value: true }));
exports.handler = void 0;
const lambda_1 = webpack_require(/*! ./src/lambda */ "./src/lambda.ts");
const handler = function (event, context, callback) {
console.log('123123123', lambda_1.handler);
(0, lambda_1.handler)(event, context, callback);
};
exports.handler = handler;

})();

/******/ })()
;
//# sourceMappingURL=index.js.map`

the error as bellow:

Service configuration (serverless.yml) content

service: serverless-nestjs
custom:
  serverless-offline:
    httpPort: 4000

provider:
  name: aws
  stage: ${opt:stage, 'dev'}
  runtime: nodejs16.x
  region: us-east-1

plugins:
  - serverless-offline

package:
  exclude:
    - .git/**
    - src/**
    - test/**
    - e2e/**
    - nodemon.json
    - README.md

functions:
  index:
    handler: dist/index.handler
    events:
      - http:
          cors: true
          path: '/'
          method: any
      - http:
          cors: true
          path: '{proxy+}'
          method: any
    environment:
      Encrypt_TokenUrl: ${file(./config.json):Encrypt_TokenUrl}
      Encrypt_ClientID: ${file(./config.json):Encrypt_ClientID}
      Encrypt_ClientSecret: ${file(./config.json):Encrypt_ClientSecret}
      Encrypt_GrantType: ${file(./config.json):Encrypt_GrantType}

Command name and used flags

sls offline start

Command output

Offline [http for lambda] listening on http://localhost:3002
Function names exposed for local invocation by aws-sdk:
           * index: serverless-nestjs-dev-index

   ┌─────────────────────────────────────────────────────────────────────────┐
   │                                                                         │
   │   ANY | http://localhost:4000/dev                                       │
   │   POST | http://localhost:4000/2015-03-31/functions/index/invocations   │
   │   ANY | http://localhost:4000/dev/{proxy*}                              │
   │   POST | http://localhost:4000/2015-03-31/functions/index/invocations   │
   │                                                                         │
   └─────────────────────────────────────────────────────────────────────────┘

Server ready: http://localhost:4000 🚀


ANY /dev (λ: index)
✖ Unhandled exception in handler 'index'.
✖ Runtime.HandlerNotFound: SERVERLESS_API/serverless-api/dist/index.handler is undefined or not exported


### Environment information

```shell
Framework Core: 3.34.0 (local)
Plugin: 6.2.3
SDK: 4.3.2

[Hawley-hy]

when I use webpack to bundle and build my project. the sls offline start not working well.

ANY /dev (λ: index)
✖ Unhandled exception in handler 'index'.

Though debug I fund _tryRequire can't load the js file that bundle by webpack

[pavlochernovyy]

Hello @Hawley-hy,
I think the problem is in declaration: handler: dist/index.handler
I suppose the path should be of existing file, not the bundled one.

[majirieyowel]

Hello @Hawley-hy Did you figure this out? I'm experiencing the same issue.