Can't access custom CDK resource outputs from Lambda function

[nathanagez]

Before opening, please confirm:

• I have installed the latest version of the Amplify CLI (see above), and confirmed that the issue still persists.
• I have searched for duplicate or closed issues.
• I have read the guide for submitting bug reports.
• I have done my best to include a minimal, self-contained set of instructions for consistently reproducing the issue.

How did you install the Amplify CLI?

yarn

If applicable, what version of Node.js are you using?

v14.17.0

Amplify CLI Version

7.6.13

What operating system are you using?

Mac

Did you make any manual changes to the cloud resources managed by Amplify? Please describe the changes made.

No manual changes made

Amplify Categories

custom, function

Amplify Commands

push

Describe the bug

We don't have the ability to access output variables from custom CDK code in Lambda function.

Expected behavior

We should be able to access output variables from custom resources using the dependsOn statement in the backend-config.json file.

Reproduction steps

Add custom resource:
amplify add custom select CDK and name it "video"

Add an CfnOutput value for this stack:

new cdk.CfnOutput(this, "outputKey", {
  value: "TEST_FROM_CDK"
});

Add Lambda function:
amplify add function

Update backend-config.json depnedsOn entry:

"yourLambda": {
      "build": true,
      "providerPlugin": "awscloudformation",
      "service": "Lambda",
      "dependsOn": [
        {
          "category": "custom",
          "resourceName": "video",
          "attributes": [
            "outputKey"
          ]
        }
      ]
    }

Update the Lambda CloudFormation stack:

  "AWSTemplateFormatVersion": "2010-09-09",
  "Description": "{\"createdOn\":\"Mac\",\"createdBy\":\"Amplify\",\"createdWith\":\"7.6.3\",\"stackType\":\"function-Lambda\",\"metadata\":{}}",
  "Parameters": {
    "CloudWatchRule": {
      "Type": "String",
      "Default": "NONE",
      "Description": " Schedule Expression"
    },
    "deploymentBucketName": {
      "Type": "String"
    },
    "env": {
      "Type": "String"
    },
    "s3Key": {
      "Type": "String"
    },
    "customvideooutputKey": {
      "Type": "String"
    }
  }

Populate parameter values:
amplify env checkout <your-env>

Deploy:
amplify push

Note:

If someone can give me explanations on how the outputs are shared between the stacks and hints on how to implement this feature I might be able to do it!

GraphQL schema(s)

No response

Log output

No response

Additional information

No response

[josefaidt]

Hey @nathanagez 👋 thanks for raising this! Unfortunately this is not currently supported, however I've updated the title and labels on #9087 to better reflect the request. I'll mark this as a duplicate feature request, and for further updates please subscribe to #9087 🙂