Hi there, congratulations on your work done on SST! It seems very nice, so I'm giving it a try, so far I've been using Serverless Framework (SF) with plugin

serverless-webpack

to get small-sized lambdas and when I migrated a simple project over SST, I found that with SST I get bigger sized lambdas.

Yes you can. SST uses

esbuild

behind the scenes (there's also a SF plugin for that) and it's much faster than webpack. You can use the

bundle

property in function and even as a default globally, here's the API for it https://docs.serverless-stack.com/constructs/Function#functionbundlenodejsprops You can also use esbuild plugins (e.g. for decorators)

Using

new Function(stack, 'createUser', {
    handler: 'modules/users/useCases/createUser/index.handler',
    bundle: {
      format: "esm",
      minify: true
    }
  });

I get a smaller size (406.3 kB) but it still falls short of SF's 98kB, could you share your

bundle

settings?

I don't have anything different, but it depends a lot on the code. Were you excluding

aws-sdk

with webpack? Maybe it's getting bundled

Also look out for re-exported modules via an index.ts - let me find the thread this was discussed in

I need to do a video on debugging this