This is a Bug Report

Description

This vague issue is mentioned in other bug reports, so apologies if it’s a duplicate, but while the error code is the same those issues/resolutions seem unrelated to what’s happening to me.

• What went wrong?

When deploying to AWS and trying to access my lambdas, I’m getting:

Unable to import module 'src/service/authentication/handler': Error

This is the only error I see (no stacktrace…).

• What was the config you used? serverless.yml:

service: ${opt:service, 'OurApplicationName'}

frameworkVersion: '>=1.0.0 <2.0.0'

provider:
  name: aws
  runtime: nodejs8.10
  stage: ${opt:stage, 'dev'}

  region: 'ap-southeast-2'
  role: '${self:custom.roles.default}'

  deploymentBucket:
    name: '${self:provider.stage}-${self:service}-deployment-bucket'
    serverSideEncryption: 'AES256'

  # VPC configuration per environment (dev, qa, prod)
  # This is required for deployment, but not during Lambda execution.
  vpc: '${file(./serverless-vpc-config.yml):${opt:stage, self:provider.stage}}'

  environment: '${file(.env.${opt:stage, self:provider.stage}.yml)}'

  iamRoleStatements:
    - Effect: 'Allow'
      Action:
        - 'lambda:InvokeFunction'
      Resource:
      - Fn::Join:
        - ':'
        - - arn:aws:lambda
          - Ref: AWS::Region
          - Ref: AWS::AccountId
          - function:${self:service}-${opt:stage, self:provider.stage}-*


functions:
  ${file(resource/serverlessHelper.js):aggregatedFunctions}

plugins:
  - serverless-swagger-documentation
  - serverless-webpack
  - serverless-dynamodb-local
  - serverless-s3-local
  - serverless-offline
  - serverless-offline-scheduler
  - serverless-domain-manager

resources:
  Resources:
    '${file(resource/serverlessHelper.js):cloudformationResources}'

custom:
   # A bunch of dynamoDB seeding stuff here


  # serverless-webpack configuration
  webpack:
    includeModules: true

My folder structure is like so:

/
├── resource
│   └── // database initialization, swagger documentation tooling, authentication...
├── src
│   ├── service
│   │   └── profile
│   │       ├── handler.js
│   │       ├── profile.fn.yml
       └── // All services have their own folders in here
serverless.yml
webpack.config.js

My webpack.config.js:

var yaml = require('js-yaml')
var fs = require('fs')
var path = require('path')
var nodeExternals = require('webpack-node-externals')
const slsw = require('serverless-webpack');


module.exports = {
  entry: slsw.lib.entries,
  devtool: 'source-map',
  target: 'node',
  externals: [nodeExternals()],
  module: {
    rules: [{
      test: /\.js$/,
      loader: 'babel-loader',
      include: __dirname,
      exclude: /node_modules/
    }]
  },
  output: {
    libraryTarget: 'commonjs',
    path: path.resolve(__dirname, '.webpack'),
    filename: '[name].js'
  }
};

Additional Data

• Serverless-Webpack Version you’re using: 5.1.3
• Webpack version you’re using: 3.5.5
• Serverless Framework Version you’re using: 1.26.1

I get the feeling these errors are because of my folder structure? We’ve been on an old version of webpack/serverless webpack for the past year and these errors are happening since upgrading from serverless-webpack v2