From @nestjs/resilience

Who this is for: NestJS apps using @nestjs/resilience that need strategies it doesn’t have (hedging, cache, lock, sliding-window or Redis-backed rate limits, adaptive concurrency, chaos), breaker state shared across instances, OpenTelemetry/Prometheus export, or Nest 10 and 11 support.

The two packages put their decorators in different places. @nestjs/resilience decorates entry points (controllers, resolvers, message handlers, gateways) through a global interceptor, and offers policy objects for services. @ylcnfrht/resilience/nestjs decorates provider methods (services, repositories, API clients) and doesn’t touch entry points. So a migration moves resilience one layer down, next to the call it protects. You don’t have to move everything: the two can run in the same app (see Using both).

Concept mapping

Module

@nestjs/resilience 0.0.3	@ylcnfrht/resilience/nestjs
ResilienceModule.forRoot({ presets })	ResilienceModule.forRoot({ pipelines })
a preset { timeout, retry, circuitBreaker, bulkhead, outboundRateLimit, fallback }	a function (builder) => builder.addRetry(…).addCircuitBreaker(…).addTimeout(…)
defaults (field defaults per stage)	no equivalent: set options per pipeline
forRootAsync({ useFactory, inject, imports })	same (useClass / useExisting are not supported)
mapErrors: true (transport errors)	an exception filter with describeResilienceError() (see NestJS)
isGlobal	always global

Decorators

@nestjs/resilience	@ylcnfrht/resilience/nestjs (on a provider method)
@Resilience('carrier') (preset)	@UsePipeline('carrier')
@Retry({ attempts: 3 }) (attempts include the first)	@Retry({ maxRetryAttempts: 2 }) (retries only)
@Retry(5) / @Retry(false)	@Retry({ maxRetryAttempts: 4 }) / leave the decorator out
backoff: { delay, factor, maxDelay, jitter: 'full' }	{ backoffType: 'exponential', delay, factor, maxDelay, useJitter: 'full' }
retryIf(error, attempt)	shouldHandle: ({ outcome, attemptNumber }) => …
idempotent: true	not needed: a provider method has no HTTP method; every decorated call is retried
@Timeout('1.5s') (per attempt)	@Timeout(1500) or @Timeout({ timeout: '1.5s' }), below @Retry for per attempt
@CircuitBreaker({ failureRateThreshold: 50 })	@CircuitBreaker({ failureRatio: 0.5 })
minimumCalls	minimumThroughput
slidingWindow: { type: 'count', size: 20 }	samplingCount: 20
slidingWindow: { type: 'time', size: '30s' }	samplingDuration: '30s'
openDuration	breakDuration
halfOpenMaxCalls	halfOpenMaxCalls
recordIf(error)	shouldHandle: ({ outcome }) => …
@CircuitBreaker('name') (shared by name)	@UsePipeline('name') with a breaker in that pipeline
@Bulkhead({ maxConcurrent, maxQueue, queueTimeout })	@ConcurrencyLimit({ permitLimit, queueLimit, queueTimeout })
@Fallback('method', { handleIf })	@Fallback({ fallbackAction, shouldHandle })
preset outboundRateLimit: { limit, interval, maxWait }	@Resilience((b) => b.addFixedWindowRateLimiter({ permitLimit, window, queueTimeout })), or @RateLimit({ tokenLimit, replenishmentPeriod })
@Signal() signal: AbortSignal	getResilienceSignal() inside the method
inject ResilienceContext (signal, attempt)	getResilienceContext() (signal, attemptNumber from 0)

Services, events, errors

@nestjs/resilience	@ylcnfrht/resilience
ResilienceService.preset(name)	inject ResiliencePipelineRegistry, registry.getPipeline(name)
ResilienceService.create(options, name)	new ResiliencePipelineBuilder({ name })…build()
policy.execute(({ signal, attempt }) => …, { source })	pipeline.execute(({ signal, attemptNumber }) => …, { name })
circuitBreakers(), circuitBreaker(name).state	registry.circuitBreakers(), or a CircuitBreakerStateProvider
bulkheads()	registry.limiters()
trip() / reset()	manualControl.isolate() / manualControl.close()
ResilienceEvents.events$ (RxJS)	onTelemetry((event) => …)
diagnostics channel nestjs:resilience:<type>	diagnostics channel @ylcnfrht/resilience (TELEMETRY_CHANNEL)
ResilienceTimeoutError (TIMEOUT, 504)	TimeoutRejectedError (TIMEOUT, 504)
CircuitOpenError (CIRCUIT_OPEN, 503)	BrokenCircuitError (CIRCUIT_OPEN, 503)
BulkheadFullError (BULKHEAD_FULL, 503)	BulkheadRejectedError (BULKHEAD_FULL, 503)
OutboundRateLimitError (RATE_LIMITED, 503)	RateLimiterRejectedError (RATE_LIMITED, 429)

Side by side

Module and a preset

@nestjs/resilience

import { ResilienceModule } from '@nestjs/resilience';

ResilienceModule.forRoot({
  defaults: { timeout: '5s', retry: { attempts: 3, backoff: { delay: '200ms', maxDelay: '2s' } } },
  presets: {
    carrier: {
      timeout: '2s',
      retry: { attempts: 2 },
      circuitBreaker: { failureRateThreshold: 50, minimumCalls: 10, openDuration: '30s' },
    },
  },
});

@ylcnfrht/resilience

import { ResilienceModule } from '@ylcnfrht/resilience/nestjs';

ResilienceModule.forRoot({
  pipelines: {
    carrier: (b) =>
      b
        .addRetry({ maxRetryAttempts: 1, backoffType: 'exponential', delay: '200ms', maxDelay: '2s', useJitter: 'full' })
        .addCircuitBreaker({ failureRatio: 0.5, minimumThroughput: 10, samplingCount: 20, breakDuration: '30s' })
        .addTimeout('2s'),
  },
});

attempts: 2 is one retry. samplingCount: 20 reproduces their default window (the last 20 calls). The order of the calls is the order of the stages, outermost first: retry around the breaker around a timeout per attempt.

From the controller to the service

@nestjs/resilience

@Controller('shipping')
export class ShippingController {
  @Get('quotes')
  @Resilience('carrier')
  @Timeout('1.5s')
  @Fallback('flatRateQuotes', { handleIf: (error) => error instanceof CircuitOpenError })
  getQuotes(@Query('orderId') orderId: string, @Signal() signal: AbortSignal) {
    return this.shippingService.getQuotes(orderId, signal);
  }

  flatRateQuotes() {
    return this.shippingService.flatRateQuotes();
  }
}

@ylcnfrht/resilience

import { Injectable } from '@nestjs/common';
import { isBrokenCircuitError } from '@ylcnfrht/resilience';
import { Fallback, UsePipeline, getResilienceSignal } from '@ylcnfrht/resilience/nestjs';

@Injectable()
export class ShippingService {
  @Fallback({
    shouldHandle: ({ outcome }) => !outcome.ok && isBrokenCircuitError(outcome.error),
    fallbackAction: () => FLAT_RATE_QUOTES,
  })
  @UsePipeline('carrier')
  async getQuotes(orderId: string) {
    const order = await this.orders.findOne(orderId);
    return this.carrier.getQuotes(order, getResilienceSignal());
  }
}

The controller calls shippingService.getQuotes(orderId) without decorators. The 1.5 s route-level timeout from the left has no direct equivalent on a shared pipeline: either give the route its own pipeline, or put an inbound deadline on the request with resilienceMiddleware({ timeout }) from @ylcnfrht/resilience/http, which nested pipelines inherit.

Policy objects in services

@nestjs/resilience

@Injectable()
export class RepricingService {
  private readonly policy: ResiliencePolicy;

  constructor(resilience: ResilienceService) {
    this.policy = resilience.preset('carrier');
  }

  quote(order: Order) {
    return this.policy.execute(({ signal }) => this.carrier.getQuotes(order, signal), {
      source: 'RepricingService.quote',
    });
  }
}

@ylcnfrht/resilience

import { Injectable } from '@nestjs/common';
import { ResiliencePipelineRegistry, type ResiliencePipeline } from '@ylcnfrht/resilience';

@Injectable()
export class RepricingService {
  private readonly pipeline: ResiliencePipeline;

  constructor(registry: ResiliencePipelineRegistry) {
    this.pipeline = registry.getPipeline('carrier');
  }

  quote(order: Order) {
    return this.pipeline.execute(({ signal }) => this.carrier.getQuotes(order, signal), {
      name: 'RepricingService.quote',
    });
  }
}

As with presets, the named pipeline is one instance: the job and every @UsePipeline('carrier') method share its breaker.

Events

@nestjs/resilience

events.events$.subscribe((event) => {
  if (event.type === 'circuit-open') logger.warn(`Circuit "${event.policy}" opened`);
});

@ylcnfrht/resilience

import { onTelemetry } from '@ylcnfrht/resilience';

const off = onTelemetry((event) => {
  if (event.event === 'OnCircuitOpened') logger.warn(`Circuit "${event.source.pipelineName}" opened`);
});
// call off() in onModuleDestroy

Using both

The two packages solve different layers and don’t interfere: @nestjs/resilience maps errors and retries safe requests at the edge, @ylcnfrht/resilience protects outbound calls in providers. Several export names collide (ResilienceModule, Retry, Timeout, CircuitBreaker, Fallback, Resilience), so alias one side:

import { ResilienceModule as EdgeResilienceModule, Timeout as RouteTimeout } from '@nestjs/resilience';
import { ResilienceModule, UsePipeline } from '@ylcnfrht/resilience/nestjs';

Retry at one layer

A route retry of 3 attempts around a service retry of 3 attempts sends up to 9 calls to a dependency that is already struggling. When you add @ylcnfrht/resilience retries in a service, remove the retry from the route’s preset (or set @Retry(false) there), and vice versa.

Behavioural differences to watch

• Providers and controllers. Our decorators work on both (method guards, pipes and interceptors are kept); theirs are ignored (with a warning) on providers. A request-scoped class with a resilience decorator fails at startup, because a pipeline per request would reset its breaker on every request.
• No HTTP-method rule. Their retry only re-runs GET, HEAD, OPTIONS and GraphQL queries unless you say idempotent: true. A provider method has no method to look at, so ours retries every decorated call. Don’t put @Retry on a method that must not run twice, or call it through a pipeline with execute(fn, { idempotent: false }).
• One pipeline per decorated method. An inline @CircuitBreaker() counts only that method’s calls; there is no sharing by name. Share through @UsePipeline(name).
• No field defaults. Their defaults fill in any stage a decorator turns on. Here, an option you don’t set takes the library default (Polly’s: 3 retries, 2 s constant delay; breaker at 10% over 100 calls in 30 s). Set them in the pipeline.
• @Timeout takes milliseconds or options. @Timeout(1500) or @Timeout({ timeout: '1.5s' }); a bare string like @Timeout('1.5s') is not accepted by the decorator (it is by addTimeout()).
• Fallback. Theirs calls a method of the same class with the error and the ExecutionContext. Ours takes a fallbackAction (or fallbackValue) that receives { outcome, context } and has no access to the instance; reach shared data through a module-level value or move the fallback into the method.
• Error mapping. Theirs maps errors on every transport (HTTP, GraphQL, RPC, WebSocket) out of the box. Ours gives you describeResilienceError() with the code, HTTP status and retryAfter; you register the filter. A rate-limit rejection maps to 429 here, 503 there.
• Breaker defaults. Theirs: 50% over the last 20 calls, at least 10, open 30 s. Ours, without options: 10% over at least 100 calls in a 30 s window, open 5 s.
• Version range. @nestjs/resilience 0.0.3 needs Nest 12. @ylcnfrht/resilience/nestjs works with @nestjs/common and @nestjs/core 10 and later.

What you gain

• Hedging, cache and coalescing, lock, sliding-window, partitioned and Redis-backed rate limits, adaptive concurrency, chaos, retry budget.
• Breaker state shared across instances through Redis.
• Typed errors with settle(), OpenTelemetry and Prometheus adapters, deadline propagation into nested calls.

Related: NestJS integration, Express and Hono, Circuit breaker.