new awsx.ecs.FargateService(imageName, {
    name: imageName,
    cluster,
    subnets: ['subnet-1', 'subnet-2, 'subnet-3'],
    securityGroups: ['sg-x'],
    taskDefinitionArgs: {
      container: {
        image: `<http://myaccount.dkr.ecr.us-west-2.amazonaws.com/${imageName}|myaccount.dkr.ecr.us-west-2.amazonaws.com/${imageName}>`,
        cpu: compute || 512 /*10% of 1024*/,
        memory: memory || 512 /*MB*/,
        portMappings: [targetGroupListener],
        environment: environment || [
          { name: 'NODE_ENV', value: 'production' },
          { name: 'PORT', value: '80' },
        ],
      },
    },
    desiredCount: desiredCount || 2,
  });

Plan apply failed: InvalidParameterException: subnets can not be empty.
    	status code: 400, request id: 0e12e236-0189-418c-a510-6961c10c28be "fieldbook_mobile_api"

pulumi preview --diff

networkConfiguration

Service

subnets

networkConfiguration           : {
                assignPublicIp: true
                securityGroups: [
                    [0]: "sg-x"
                ]
            }

subnets

cluster.vpc.publicSubnetIds