Serverless Stack

Just for clarification, to convert a Node 14 Lambda from being bundled as CJS to being bundled as ESM, all that is required is to mark <https://docs.serverless-stack.com/constructs/Function#format> to `esm`?

All should be well, tree-shook, etc?

I think Dax has this has all been sorted out now, though you will wanna be on a version after this landed. <https://github.com/serverless-stack/serverless-stack/commit/1f1e45f27ffd513c2aa4d5196490faded33d71cb>

Generally esbuild has been pretty good at shaking things out, however I have had to add `/*@__PURE__*/` comments occasionally to make sure it knew its cool to drop it.

<@U02KMF9HDPB> yeah setting `bundle.format` should just work. Let us know if otherwise.