TypeKro

Write TypeScript. Deploy Kubernetes. Runtime intelligence included.

📚 Documentation • 💬 Discord • 🚀 Getting Started

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What is TypeKro?

TypeKro is a TypeScript-first framework for orchestrating Kubernetes resources with type safety and runtime intelligence. Write infrastructure in pure TypeScript with full IDE support, then deploy directly to clusters or generate deterministic YAML for GitOps workflows.

Quick Start

bun add typekro arktype

import { type } from 'arktype';
import { kubernetesComposition } from 'typekro';
import { Deployment, Service } from 'typekro/simple';

// Define a reusable WebApp composition
const WebApp = kubernetesComposition({
  name: 'webapp',
  apiVersion: 'example.com/v1',
  kind: 'WebApp',
  spec: type({ name: 'string', image: 'string', replicas: 'number' }),
  status: type({ ready: 'boolean', endpoint: 'string' })
}, (spec) => {
  const deploy = Deployment({ id: 'app', name: spec.name, image: spec.image, replicas: spec.replicas });
  const svc = Service({ id: 'svc', name: `${spec.name}-svc`, selector: { app: spec.name }, ports: [{ port: 80 }] });

  return {
    ready: deploy.status.readyReplicas > 0,     // ✨ JavaScript → CEL
    endpoint: `http://${svc.status.clusterIP}`  // ✨ Template → CEL
  };
});

// Deploy multiple instances with a simple loop
const apps = [
  { name: 'frontend', image: 'nginx', replicas: 3 },
  { name: 'api', image: 'node:20', replicas: 2 }
];

const factory = WebApp.factory('direct', { namespace: 'production' });
for (const app of apps) await factory.deploy(app);

What this demonstrates:

• Reusable compositions - Define once, deploy many times
• Type-safe schemas - ArkType validates at compile-time and runtime
• Cross-resource references - svc.status.clusterIP references live cluster state
• JavaScript-to-CEL - Status expressions become runtime CEL
• Native loops - Just for...of to deploy multiple apps

Why TypeKro?

Feature	TypeKro	Pulumi	CDK8s	Helm
Type Safety	✅ Full TypeScript	✅ Multi-lang	✅ TypeScript	❌ Templates
GitOps Ready	✅ Deterministic YAML	❌ State backend	✅ YAML output	✅ Charts
Runtime Refs	✅ CEL expressions	❌ Deploy-time	❌ Static	❌ Templates
Learning Curve	🟢 Just TypeScript	🔴 New concepts	🟡 TS + K8s	🔴 Templates
Stateless	✅	❌ State backend	✅	✅
Cross-Resource	✅ Runtime resolution	❌ Deploy-time	❌ Manual	❌ Manual

Deployment Modes

TypeKro supports multiple deployment strategies from the same code:

// 1. Direct deployment - immediate, no Kro required
const factory = graph.factory('direct', { namespace: 'dev' });
await factory.deploy(spec);

// 2. Kro deployment - runtime CEL evaluation
const kroFactory = graph.factory('kro', { namespace: 'prod' });
await kroFactory.deploy(spec);

// 3. YAML generation - GitOps workflows
const yaml = kroFactory.toYaml();
writeFileSync('k8s/app.yaml', yaml);

Core Features

Type-Safe Schemas with ArkType

const AppSpec = type({
  name: 'string',
  image: 'string',
  replicas: 'number',
  'environment?': '"dev" | "staging" | "prod"'
});

Cross-Resource References

const db = Deployment({ id: 'database', name: 'postgres', image: 'postgres:15' });
const api = Deployment({
  id: 'api',
  name: 'api-server',
  image: 'node:20',
  env: {
    DB_HOST: db.metadata.name  // Runtime reference
  }
});

JavaScript-to-CEL Conversion

Write natural JavaScript - TypeKro converts to CEL:

return {
  ready: deploy.status.readyReplicas > 0,           // → ${app.status.readyReplicas > 0}
  url: `http://${svc.status.clusterIP}`,            // → http://${svc.status.clusterIP}
  phase: deploy.status.phase === 'Running' ? 'up' : 'down'
};

Helm Integration

import { helmRelease, helmRepository } from 'typekro';

const repo = helmRepository({
  name: 'bitnami',
  url: 'https://charts.bitnami.com/bitnami'
});

const release = helmRelease({
  name: 'nginx',
  repository: repo,
  chart: 'nginx',
  values: {
    replicaCount: spec.replicas  // Type-safe values
  }
});

YAML File Integration

import { yamlFile } from 'typekro';

const existing = yamlFile({
  path: './k8s/existing-deployment.yaml',
  namespace: 'default'
});

Factory Functions

TypeKro provides 50+ factory functions for Kubernetes resources:

Workloads: Deployment, StatefulSet, DaemonSet, Job, CronJob

Networking: Service, Ingress, NetworkPolicy

Config: ConfigMap, Secret

Storage: PersistentVolumeClaim, PersistentVolume, StorageClass

RBAC: ServiceAccount, Role, RoleBinding, ClusterRole, ClusterRoleBinding

View Complete API Reference →

What is Kro?

Kubernetes Resource Orchestrator (Kro) is an open-source project by AWS Labs that enables resources to reference each other's runtime state using CEL expressions.

TypeKro works in Direct Mode (no Kro required) for simple deployments, or Kro Mode for advanced orchestration with runtime dependencies.

Documentation

• Getting Started - 5-minute quick start
• Core Concepts - kubernetesComposition API
• API Reference - Complete API documentation
• Examples - Real-world patterns

Installation

# Using bun (recommended)
bun add typekro arktype

# Using npm
npm install typekro arktype

# Using yarn
yarn add typekro arktype

Requirements

• Node.js 18+ or Bun
• TypeScript 5.0+
• Kubernetes cluster (for deployment)
• Kro controller (optional, for runtime features)

Contributing

We welcome contributions! See CONTRIBUTING.md for guidelines.

# Clone the repository
git clone https://github.com/yehudacohen/typekro.git
cd typekro

# Install dependencies
bun install

# Run tests
bun run test

# Build
bun run build

License

Apache 2.0 - See LICENSE for details.

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Built with ❤️ for the Kubernetes community

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