Including node_modules in the minification

Hello. Thanks for sharing this sample project.
I came from this [article](https://aws.amazon.com/blogs/compute/optimizing-node-js-dependencies-in-aws-lambda/) and need to use my code for a Lambda@Edge (`viewer-request`), limited to 1MB size.
When I try to run the build command, I got these issue:

```
✘ [ERROR] Could not resolve "./src//node_modules"

✘ [ERROR] No loader is configured for ".lock" files: src//yarn.lock
```

If you can help out, I would really appreciate it!

Reproduce the build command using the layout shown in the errors, especially src//node_modules and yarn.lock. Determine why those paths are included in minification, then verify that the resulting Lambda@Edge viewer-request bundle excludes unnecessary files and remains under the 1 MB limit.

索引モデルが issue の本文から書いたものです。