AWS Lambda Async Handler

For when you are deploying a Lambda (Node 6.10) which you're compiling using TypeScript or Babel, and you just want to use async/await for your handler.

You're asked to provide...

exports.myHandler = function(event, context, callback) {
   ...
   // Use callback() and return information to the caller.  
}

(Source: https://docs.aws.amazon.com/lambda/latest/dg/nodejs-prog-model-handler.html)

But you want your TypeScript to be...

import wrapHandler from 'aws-lambda-async-handler'

export const hello = async (event: AWSLambda.APIGatewayEvent, context: AWSLambda.Context) => {
  //...
  if (err) {
    throw err
  }
  return result
});

So you just...

import wrapHandler from 'aws-lambda-async-handler'

export const hello = wrapHandler(
  async (event: AWSLambda.APIGatewayEvent, context: AWSLambda.Context) => {
    //...
    if (err) {
      throw err
    }
    return result
});

Or in async compiled JavaScript...

const wrapHandler = require('aws-lambda-async-handler').default

exports.myHandler = wrapHandler(async (event, context) => {
  //...
  if (err) {
    throw err
  }
  return result
})