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actor-ts
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Compatibility matrix

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The framework’s features have different support levels across runtimes. This page is the definitive reference.

For each row:

  • ✓ = supported, tested in CI.
  • ⚠ = works, but not actively CI’d.
  • ✗ = not supported.
  • N/A = doesn’t apply.

Core

Section titled “Core”
FeatureBunNode 24+Deno
Actor base class✓✓✓
ActorSystem✓✓✓
ActorOptions + withDispatcher etc.✓✓✓
MicrotaskDispatcher / ImmediateDispatcher / ThroughputDispatcher✓✓✓
BoundedMailbox / PriorityMailbox✓✓✓
Supervision strategies✓✓✓
context.timers + system.scheduler✓✓✓
Death watch✓✓✓
become / stash / unstashAll✓✓✓
Pattern matching (ts-pattern)✓✓✓

Typed API

Section titled “Typed API”
FeatureBunNode 24+Deno
Behaviors.* combinators✓✓✓
TypedActor✓✓✓
system.spawnTyped / context.spawnTyped / typedActor✓✓✓

Routing + patterns

Section titled “Routing + patterns”
FeatureBunNode 24+Deno
Router.*✓✓✓
CircuitBreaker✓✓✓
BackoffSupervisor✓✓✓
retry, pipeTo, after✓✓✓

Cluster

Section titled “Cluster”
FeatureBunNode 24+Deno
Cluster join / membership✓✓⚠
Gossip + failure detector✓✓⚠
TcpTransport✓✓⚠
TLS on cluster transport✓✓⚠
InMemoryTransport (tests)✓✓✓
ClusterSingleton✓✓⚠
ClusterSharding✓✓⚠
DistributedPubSub✓✓⚠
DistributedData✓✓⚠
Cluster router✓✓⚠
Receptionist✓✓⚠
KubernetesLease✓✓⚠
InMemoryLease✓✓✓

Persistence

Section titled “Persistence”
FeatureBunNode 24+Deno
InMemoryJournal✓✓✓
InMemorySnapshotStore✓✓✓
SqliteJournal✓ (bun:sqlite)✓ (better-sqlite3 peer dep)✗
SqliteSnapshotStore✓✓✗
CassandraJournal⚠✓ (cassandra-driver)⚠
CachedSnapshotStore✓✓✓
PersistentActor✓✓✓
DurableStateActor✓✓✓
ProjectionActor✓✓✓
Object-storage snapshot store (filesystem)✓✓✓
Object-storage snapshot store (S3)⚠✓⚠
Schema-migration adapters✓✓✓
Replicated event sourcing⚠✓✗

I/O brokers

Section titled “I/O brokers”
FeatureBunNode 24+Deno
KafkaActor (kafkajs)✓✓⚠
MqttActor (mqtt)✓✓⚠
AmqpActor (amqplib)⚠✓⚠
NatsActor (nats)✓✓⚠
JetStreamActor✓✓⚠
RedisStreamsActor (ioredis)✓✓⚠
GrpcServerActor / GrpcClientActor✓✓⚠
WebsocketClientActor✓✓✓
websocket() route (WebsocketServerActor)✓ (Bun.serve)✓ (@fastify/websocket / ws)⚠
SseActor✓✓✓
TcpSocketActor✓✓✓
TcpServerActor✓✓✓ (mTLS listener: ✗)
UdpSocketActor✓✓✓

HTTP

Section titled “HTTP”
FeatureBunNode 24+Deno
Route DSL✓✓✓
Marshalling (entity<T>)✓✓✓
FastifyBackend✓✓✓
ExpressBackend✓✓⚠
HonoBackend✓✓✓
Middleware (response-cache, rate-limit, idempotency-key)✓✓✓
HttpClient (uses fetch)✓✓✓
managementRoutes✓✓✓

Cache

Section titled “Cache”
FeatureBunNode 24+Deno
In-memory cache✓✓✓
Memcached cache⚠✓⚠
Redis cache✓✓⚠

Serialization

Section titled “Serialization”
FeatureBunNode 24+Deno
JSON✓✓✓
CBOR✓✓✓
Custom serializers✓✓✓

Observability

Section titled “Observability”
FeatureBunNode 24+Deno
Core metrics✓✓✓
Prometheus exporter✓✓✓
prom-client adapter✓✓⚠
OTel metrics adapter✓✓⚠
RecordingTracer✓✓✓
OTel tracing adapter✓✓⚠
Stock metrics✓✓✓
Health checks✓✓✓

TestKit

Section titled “TestKit”
FeatureBunNode 24+Deno
TestKit.create✓✓✓
TestProbe✓✓✓
ManualScheduler✓✓✓
MultiNodeSpec✓✓⚠
ParallelMultiNodeSpec✓✓⚠
Section titled “Cell-recommended targets”
For new projects:                              Bun
For Node-shop environments:                    Node 24+
For Lambda / serverless:                       Node 24+
For Deno-first organizations:                  Deno (with caveats)
For mixed:                                     Pick one per cluster

Where to next

Section titled “Where to next”