foo.tf

provider "helm" {
    kubernetes {
        config_path = "${local_file.kubeconfig.filename}"        
    }
}

provider "helm" {
    kubernetes {
        host                   = "${aws_eks_cluster.eks_master.endpoint}"
        cluster_ca_certificate = "${base64decode(aws_eks_cluster.eks_master.certificate_authority.0.data)}"
        token                  = "${module.auth.token}"
    }
}