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Empty files in serverless package zip

See original GitHub issue

This is a (Bug Report / Feature Proposal)

Bug

Description

For bug reports:

What went wrong: All the files in the .serverless/<package>.zip are empty.
What did you expect should have happened: non-empty files
What was the config you used:

I have just tried to run sls package in one of the example project with same result, empty files in ZIP:

serverless.yml

...
  webpack:
    webpackConfig: ./webpack.config.js
    includeModules: true
...

webpack.config.js

const slsw = require("serverless-webpack")
const nodeExternals = require("webpack-node-externals")
// const CopyPlugin = require("copy-webpack-plugin")

module.exports = {
  entry: slsw.lib.entries,
  target: 'node',
  // Generate sourcemaps for proper error messages
  devtool: 'source-map',
  // Since 'aws-sdk' is not compatible with webpack,
  // we exclude all node dependencies
  externals: [nodeExternals()],
  mode: slsw.lib.webpack.isLocal ? "development" : "production",
  optimization: {
    // We do not want to minimize our code.
    minimize: false
  },
  performance: {
    // Turn off size warnings for entry points
    hints: false
  },
  // node: false,
  // devtool: 'inline-cheap-module-source-map',
  // Run babel on all .js files and skip those in node_modules
  module: {
    rules: [
      {
        test: /\.js$/,
        include: __dirname,
        exclude: /node_modules/,
        use: [
          {
            loader: 'babel-loader',
            options: {
              presets: [
                [
                  '@babel/preset-env',
                  {
                    targets: { node: '12' },
                    useBuiltIns: 'usage',
                    corejs: 3,
                  },
                ],
              ],
            },
          },
        ],
      },
    ],
  },
  plugins: [
    // TODO
    // new CopyPlugin([
      // 'path/to/specific/file',
      // 'recursive/directory/**',
    // ]),
  ],
};