Serverless Stack

How the lambda bundle process works? What is pushed to s3 as our lambda? What dependencies?

<https://github.com/serverless-stack/serverless-stack/blob/master/packages/resources/src/util/nodeBuilder.ts#L122>

<https://github.com/serverless-stack/serverless-stack/blob/master/packages/core/src/runtime/handler/node.ts#L79>

the function below, `build` is how it's built for local dev

But basically we use `esbuild` to bundle all of your deps + code into a single file. It treeshakes what it can.  You can omit stuff from there by using `bundle.nodeModules` or `bundle.external`