Web Application Compositions

Higher-level compositions that wire together CNPG PostgreSQL, Valkey cache, Inngest workflow engine, and your application deployment. All connection strings are automatically injected as environment variables.

Import

import { webAppWithProcessing } from 'typekro/webapp';

webAppWithProcessing

Deploys a complete application stack with automatic wiring:

Component	Resource	Wired env var
PostgreSQL	CNPG Cluster + PgBouncer Pooler	DATABASE_URL
Cache	Valkey cluster	VALKEY_URL, REDIS_URL
Workflow engine	Inngest (external DB mode)	INNGEST_BASE_URL; credentials are injected from a generated Secret via envFrom
Application	Deployment + Service	—

Quick Example

import { webAppWithProcessing } from 'typekro/webapp';

// 'kro' = continuous reconciliation, 'direct' = immediate apply
const factory = webAppWithProcessing.factory('kro', {
  namespace: 'production',
  waitForReady: true,
});

const instance = await factory.deploy({
  name: 'my-app',
  namespace: 'production',
  app: {
    image: 'my-app:latest',
    port: 3000,
    replicas: 2,
    env: {
      NODE_ENV: 'production',
    },
  },
  database: {
    instances: 3,
    storageSize: '50Gi',
    storageClass: 'gp3',
    database: 'myapp',
  },
  cache: {
    shards: 3,
    replicas: 1,
  },
  processing: {
    eventKey: 'your-hex-event-key',
    signingKey: 'your-hex-signing-key',
    sdkUrl: ['http://my-app:3000/api/inngest'],
  },
});

What gets deployed

Given name: 'my-app', the composition creates:

Resource	Name	Type
PostgreSQL cluster	my-app-db	CNPG Cluster (3 instances)
Connection pooler	my-app-db-pooler	CNPG Pooler (PgBouncer, transaction mode)
Cache	my-app-cache	Valkey cluster
Workflow engine	my-app-inngest	Inngest (HelmRelease, external DB)
Application	my-app	Deployment + Service

Environment variables injected into the app

DATABASE_URL=postgresql://app@my-app-db-pooler:5432/myapp
VALKEY_URL=redis://my-app-cache:6379
REDIS_URL=redis://my-app-cache:6379
INNGEST_BASE_URL=http://my-app-inngest:8288
INNGEST_EVENT_KEY=<from generated Secret>
INNGEST_SIGNING_KEY=<from generated Secret>

The composition creates an Inngest credentials Secret and prepends it to app.envFrom for direct deployments. In KRO mode, the generated Inngest credentials Secret is still mounted, but schema-provided app.envFrom entries are not merged into the generated Deployment because KRO cannot safely concatenate typed list fields. User-provided app.env values are still merged on top of generated direct environment variables, so they can override direct values such as DATABASE_URL or INNGEST_BASE_URL.

In KRO mode, processing.eventKey and processing.signingKey are still plain custom-resource spec fields before TypeKro copies them into the generated Secret. Treat webapp custom resources as sensitive and restrict RBAC read access to those CRs.

Status

instance.status.ready       // all components healthy
instance.status.databaseUrl // postgresql://app@...-db-pooler:5432/...
instance.status.databaseHost // ...-db-pooler
instance.status.databasePort // 5432
instance.status.cacheUrl    // redis://...-cache:6379
instance.status.cacheHost   // ...-cache
instance.status.cachePort   // 6379
instance.status.inngestUrl  // http://...-inngest:8288
instance.status.appUrl      // http://...:3000

instance.status.components.app       // app deployment ready
instance.status.components.database  // CNPG cluster healthy
instance.status.components.cache     // Valkey ready
instance.status.components.inngest   // Inngest ready

Configuration

Field	Required	Description
name	Yes	App name (prefix for all resources)
namespace	No	Target namespace (default: 'default')
app.image	Yes	Container image
app.port	No	Container port (default: 3000)
app.replicas	No	Replica count (default: 1)
app.env	No	Extra env vars (merged with auto-wired ones)
app.envFrom	No	Additional Secret/ConfigMap envFrom sources for direct deployments. TypeKro prepends the generated Inngest credentials Secret, so later entries can override only by defining the same env keys in a later source according to Kubernetes envFrom behavior. In KRO mode, only the generated Inngest credentials Secret is mounted
database.storageSize	Yes	PG storage (e.g., '50Gi')
database.instances	No	PG replicas (default: 1)
database.storageClass	No	Storage class
database.database	No	Database name (default: app)
database.owner	No	DB owner (default: 'app')
cache.shards	No	Valkey shards (default: 3)
cache.replicas	No	Replicas per shard (default: 0)
cache.volumePermissions	No	Enable the Valkey volume permissions init container
cache.storageSize	No	Storage size per Valkey shard (default: '1Gi')
processing.eventKey	Yes	Inngest event key (hex string); sensitive in KRO custom-resource specs
processing.signingKey	Yes	Inngest signing key (hex string); sensitive in KRO custom-resource specs
processing.sdkUrl	No	App SDK URLs for function sync
processing.replicas	No	Inngest server replicas (default: 1)
processing.resources	No	CPU/memory requests and limits for the Inngest server
cnpgOperator	No	CloudNativePG operator singleton settings; accepts the underlying CNPG bootstrap fields such as name, namespace, version, resources, customValues, and shared. name/namespace customize the install target; the singleton identity is fixed by the composition.
valkeyOperator	No	Valkey operator singleton settings; accepts the underlying Valkey bootstrap fields such as name, namespace, version, resources, customValues, and shared. name/namespace customize the install target; the singleton identity is fixed by the composition.

Prerequisites

Install the TypeKro runtime first so Flux and KRO are available. The webapp composition bootstraps CloudNativePG and Valkey operators itself as shared singleton dependencies.

• TypeKro runtime — Flux CD plus KRO controller
• CloudNativePG operator — bootstrapped by this composition
• Valkey operator — bootstrapped by this composition

import { typeKroRuntimeBootstrap } from 'typekro';

// Install runtime first
await typeKroRuntimeBootstrap().factory('direct', { ... }).deploy({ ... });

// Then deploy the full stack; CNPG and Valkey operator singletons are included
await webAppWithProcessing.factory('kro', { ... }).deploy({ ... });

Next Steps

• CloudNativePG — PostgreSQL cluster management
• Valkey — Cache cluster management
• Inngest — Workflow engine deployment