(aws-elasticloadbalancingv2): AlbTarget does not accept an instance of IApplicationLoadBalancer

[shadab16]

Describe the bug

AlbTarget does not accept an instance of IApplicationLoadBalancer. This prevents it from being used alongside ApplicationLoadBalancer.fromLookup and ApplicationLoadBalancer.fromApplicationLoadBalancerAttributes because of their return type.

Workaround is to use AlbArnTarget directly.

Expected Behavior

No compilation error.

Current Behavior

Compilation error
error TS2345: Argument of type 'IApplicationLoadBalancer' is not assignable to parameter of type 'ApplicationLoadBalancer'.

Reproduction Steps

import * as elbv2 from 'aws-cdk-lib/aws-elasticloadbalancingv2';
import { AlbTarget } from 'aws-cdk-lib/aws-elasticloadbalancingv2-targets';

const testingAlb = elbv2.ApplicationLoadBalancer.fromLookup(this, 'TestingAlb', {
  loadBalancerTags: { Products: '...' }
});

const albTarget = new AlbTarget(testingAlb, 80);
                                ~~~~~~~~~~

Possible Solution

Constructor for AlbTarget can be changed to accept interface IApplicationLoadBalancer. The implementation only references loadBalancerArn from the given object, which is available in the interface too.

Additional Information/Context

No response

CDK CLI Version

2.100.0 (build e1b5c77)

Framework Version

No response

Node.js Version

v18.18.0

OS

Windows 10 22H2, WSL (5.15.90.1-microsoft-standard-WSL2)

Language

TypeScript

Language Version

5.2.2

Other information

No response

[peterwoodworth]

Thanks for reporting this issue, this makes sense

[github-actions]

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