Wait for a resource in pulumi

pulumiWaitFor.ts

// Make sure x is a true output so pulumi doesn't try to run this function during preview.
const ingressIP = pulumi.all([x]).apply(async ([x]) => {
  const kc = new k8sClient.KubeConfig();
  const provider = (this.getProvider('kubernetes::') as any)
  const kubeConfig = provider.kubeconfig as pulumi.Output<string>;

  const ip = kubeConfig.apply(async (config) => {
    kc.loadFromString(config);
    const k8sApi = kc.makeApiClient(k8sClient.CoreV1Api);

    while (true) {
      try {
        pulumi.log.info('Waiting for load balancer IP...', this);
        const res = await k8sApi.readNamespacedService('istio-ingressgateway', namespace)
        return res.body.status.loadBalancer.ingress[0].ip;
      } catch (err) {
        await new Promise(r => setTimeout(r, 2000));
      }
    }
  });

  return ip;
});

The apply method note: 'func' is not allowed to make resources.