sam-beta-cdk support for typescript lambda functions - aws-lambda-nodejs

[gommich]

The feature:
Would it be possible to add support for sam-cdk-beta to bundle typescript lambda functions using @aws-cdk/aws-lambda-nodejs (NodejsFunction) ?

What I've tried:
I have tried to use the @aws-cdk/aws-lambda-nodejs library to compile typescript functions as opposed to the @aws-cdk/aws-lambda library. However, what I notice is that when I run:

sam-beta-cdk build

the assets for a @aws-cdk/aws-lambda-nodejs (NodejsFunction) function only produce an index.js asset in the .aws-sam/cdk-out/asset.xxxxxxxxxxxxx/ directory but package.json also needs to be in there for the function to be build properly. If I manually add package.json from the function in question, then I can run

cdk deploy -a .aws-sam/build

and the stack will deploy correctly.

I'm not entirely sure if the solution would be as simple as adding package.json to the assets directory for a particular stack, but It seemed to work. Perhaps this is a feature I should request in the main aws-cdk repository. Please let me know if there's something I'm missing in my approach to creating typescript lambda functions.

[moelasmar]

thanks @gojko for reporting this issue, we are already tracking this as an internal task.

[LeoLapworthKT]

@moelasmar is there any update on this? - I had local development working on existing main
releases of sam/cdk before switching from plain lambda to lambdaNode cdk constructs a while ago and only just finding that it has broken this?

In case usefule for others... I have been able to make work by running the synth every time..

run.sh

export STACK=some/stack
FUNCTION_REFERENCE=FuncRefInTemplateDotYaml

export ENVFILE="local_testing/env.json"
export EVENTFILE="local_testing/event.json"
export AWS_REGION="eu-west-2"

npx cdk synth $STACK --no-staging > template.yaml

## extra step here doing a search/replace for the lambda layer SSM to it's actual value

sam local invoke --env-vars $ENVFILE --event $EVENTFILE \
     --region $AWS_REGION --profile $AWS_PROFILE $FUNCTION_REFERENCE;

[falnyr]

@mildaniel Thanks for pushing the aws/aws-lambda-builders#307 over the line. What needs to be done on the SAM CLI side for this to work? Can we help out?

[mildaniel]

This is something we are currently working on, please keep an eye out for updates!

[meg2208]

Is this still in the pipeline or currently available?

[mildaniel]

Hey all, we now support TypeScript in AWS SAM CLI natively through esbuild. In terms of CDK support, the GA version of this feature is different than the beta. Please try that and report back if similar issues exist.