Full ESM Support

[willfarrell]

We really want to have Middy support ESM, however we're blocked by a few items.

• Lambda with ESM cannot access node_modules pre-bundled in the runtime or shared in a lambda layer has made us stop and rethink. This isn't documented anywhere that I know of 😔. I've reported this regression to AWS Support and was told to use v3 of the SDK instead.

You can test this by using:

// index.mjs
import AWS from 'aws-sdk'
export const handler = () => AWS.VERSION

• The X-Ray SDK using dynamic require breaks when using ESM (Unable to use SDK with ESM bundling in AWS Lambda / Nodejs 14.x aws/aws-xray-sdk-node#482 @NathanielRN).

[willfarrell]

complete in v2 alpha

[willfarrell]

Rolled back, AWS SDK v3 is not ready for production use on Lambda. Reopened due to #585 (comment)