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Generally this error occurs when you specify the same logical name for multiple resources/stackreferences of the same type. e.g.

const stack1 = new pulumi.StackReference("dev", ...);
const stack2 = new pulumi.StackReference("dev", ...);

Thank you for the quick response. I'm working my way through the K8s Crosswalk Guide (GCP) by combining all steps into a single stack, for example (index.ts):

import * as pulumi from '@pulumi/pulumi';

import { identityStack } from './src/identity';
import { vpcStack } from './src/vpc';
import { clusterStack } from './src/cluster';

const projectName = pulumi.getProject();

// STEP 1: Identity
export const {
  project,
  adminsAccountId,
  adminsIamServiceAccountSecret,
  devsAccountId,
  devsIamServiceAccountSecret
} = identityStack();

// Step 2: Managed Infra
export const {
  networkName,
  subnetworkName
} = vpcStack(projectName);


// STEP 3: Cluster Config
export const {
  kubeconfig,
  clusterName,
  clusterSvcsNamespaceName,
  appSvcsNamespaceName,
  appsNamespaceName,
} = clusterStack(
    projectName,
    networkName,
    subnetworkName,
    devsAccountId,
    project,
);

// STEP 4: Cluster Services
// dataDogStack(projectConfig, kubeconfig, clusterSvcsNamespaceName, appSvcsNamespaceName);

// STEP 5: App Services
// appServicesStack(clusterName, kubeconfig);

Am I interpreting / implementing the general flow of how to use Pulumi in its intended manner?