Typescript x Node Lambda Layers - Syntax for creating a lambda layer that uses a makefile to build typescript

Makefile

# file path of makefile:  src/functions/shared/Makefile
build-SharedLambdaLayer:
	rm -Rf node_modules
	npm install
	npm run build
	cp -rf dist/* ${ARTIFACTS_DIR}
	npm prune --production
	cp -rf node_modules ${ARTIFACTS_DIR}

template.yaml

SharedLambdaLayer: 
    Type: AWS::Serverless::LayerVersion
    Properties:
      LayerName: shared-lambda-layer
      Description: Shared Lambda Layer
      ContentUri: src/functions/shared
      CompatibleRuntimes:
        - nodejs20.x
    Metadata:
      BuildMethod: makefile

Note, aws lambda will use index.handler by default, so even though AWS::Serverless::LayerVersion does not allow an index handler, as long as code in index.js this will work 💯