How to create a new version of a Lambda function using CloudFormation?

Question

I\'m trying to create a new version of a Lambda function using CloudFormation.

I want to have multiple versions of the same Lambda function so that I can (a) point a

Answer 1

This post is out-of-date. I am updating it here so others can see the correct solution for versioning Lambdas as of 06-09-2020, without the need for extra custom versioning Lambdas.

This:

Description: Lambda Example
Resources:
  Function:
    Type: AWS::Lambda::Function
    Properties:
      Handler: index.handler
      Code:
        ZipFile: |
          'Example Code';
      Runtime: nodejs12.x
      Timeout: 5

Becomes this:

Description: Lambda Example
Transform: AWS::Serverless-2016-10-31
Resources:
  Function:
    Type: AWS::Serverless::Function
    Properties:
      AutoPublishAlias: live
      Handler: index.handler
      InlineCode: |
        'Example Code';
      Runtime: nodejs12.x
      Timeout: 5

The Transform: allows AWS::Serverless::Function inside of a CloudFormation template which in turn supports lambda versioning.

Don't let the dated "Best Answer" above - built for that persons book - throw you down a rabbit hole like I did.

You're welcome.