Webpack and AWS Lambda issue - handler missing on module

I ran into this issue as well. However, I believe my situation was the inverse of what SamBrick shares. I was moving from transpiling ES6 with babel to run on lambda/node 6.10 to no transpiling and targeting lambda/node 8.10. Removing the library field and changing to the libraryTarget: 'commonjs' solved the problem for me.

Props to this guy: https://gist.github.com/nirnanaaa/d7f40deb38f1cf7f931dc7ef0c582bf0

To fix this issue I had to specify a library property and change the libraryTarget to commonjs2. The webpack.config.js file output now looks like this -

output: {
    path: path.resolve(__dirname, 'dist'),
    filename: 'main.js',
    library: 'main',
    libraryTarget: 'commonjs2'
  },