Support for top level async await when using esbuild.

[MattBidewell]

Hi there!

Currently using sam cli and esbuild combo for a project and would like to make use of top level await for some initialisation work.

I've got an example project here - https://github.com/MattBidewell/sam-cli-esbuild-top-level-await

Has anyone got this working when using the esbuild and sam cli together?

I suspect the issue is because the target is es2020 but I get the same issue when targeting es2022/1 as well.

[mildaniel]

Hey @MattBidewell,

Thanks for providing an example, made it really quick to reproduce. I was able to getting it working by changing the target to node16 and changing the format from cjs to esm.

Metadata: # Manage esbuild properties
   BuildMethod: esbuild
   BuildProperties:
      Target: "node16"
      Format: esm
      Sourcemap: true
      EntryPoints:
        - src/handler.ts

[MattBidewell]

@mildaniel great, I thought it was going to be something related to config somewhere!

Thanks, much appreciated!