Vestig v0.7.0: Full Deno Support, Advanced Sampling & More

We're excited to announce Vestig v0.7.0, a major release that delivers on our promise of true multi-runtime support and adds powerful new features for production observability.

What's New in v0.7.0

🦕 Full Deno Support

Vestig now runs natively on Deno 2.0+, making it the only zero-dependency logging library that works seamlessly across Node.js, Bun, Deno, Edge runtimes, and browsers.

1// Works identically in Deno, Node.js, Bun, and browsers
2import { log, RUNTIME, IS_DENO } from 'vestig'
3 
4log.info('Hello from Deno!', { runtime: RUNTIME })
5// Output: { runtime: 'deno' }

The implementation uses Deno's Node.js compatibility layer for AsyncLocalStorage via node:async_hooks, ensuring context propagation works correctly across async operations.

📊 Advanced Sampling Strategies

Control your log volume intelligently with four new sampling strategies:

Probability Sampling - Sample a percentage of logs:

1import { createLogger, createProbabilitySampler } from 'vestig'
2 
3const log = createLogger({
4  sampler: createProbabilitySampler(0.1) // 10% of logs
5})

Rate Limiting - Cap logs per time window:

1import { createRateLimitSampler } from 'vestig'
2 
3const sampler = createRateLimitSampler({
4  maxPerSecond: 100 // Max 100 logs/second
5})

Namespace-Based - Different rates per module:

1import { createNamespaceSampler } from 'vestig'
2 
3const sampler = createNamespaceSampler({
4  'api.*': 0.5,      // 50% of API logs
5  'db.query': 0.01,  // 1% of DB queries
6  'auth.*': 1.0      // 100% of auth logs
7})

Composite Sampling - Combine multiple strategies:

1import { createCompositeSampler } from 'vestig'
2 
3const sampler = createCompositeSampler([
4  createRateLimitSampler({ maxPerSecond: 1000 }),
5  createNamespaceSampler({ 'debug.*': 0.1 })
6])

🌐 W3C Trace Context: Tracestate Support

Building on our traceparent support, v0.7.0 adds full W3C tracestate compliance for vendor-specific tracing metadata:

1import { parseTracestate, createTracestate, setTracestateValue } from 'vestig'
2 
3// Parse incoming tracestate header
4const state = parseTracestate('vendor1=value1,vendor2=value2')
5 
6// Create or modify tracestate
7const newState = setTracestateValue(state, 'vestig', 'span-123')
8// Result: 'vestig=span-123,vendor1=value1,vendor2=value2'

This enables seamless integration with OpenTelemetry-instrumented services and distributed tracing backends.

⚛️ VestigErrorBoundary for React

Capture errors with full context in your React applications:

1import { VestigErrorBoundary, addBreadcrumb } from '@vestig/next/client'
2 
3// Add breadcrumbs for context
4addBreadcrumb('user.navigate', { to: '/checkout' })
5addBreadcrumb('cart.update', { items: 3 })
6 
7// Wrap your app
8<VestigErrorBoundary
9  fallback={<ErrorPage />}
10  onError={(error, breadcrumbs) => {
11    // breadcrumbs show the trail leading to the error
12    log.error('React error', { error, breadcrumbs })
13  }}
14>
15  <App />
16</VestigErrorBoundary>

📴 Offline Queue Persistence

Client-side logs now survive page reloads with localStorage persistence:

1import { useLogger } from '@vestig/next/client'
2 
3const log = useLogger({
4  offline: {
5    enabled: true,
6    maxSize: 100,        // Max queued entries
7    storageKey: 'vestig-offline'
8  }
9})
10 
11// Logs are queued when offline and sent when connection resumes
12log.info('User action', { action: 'purchase' })

Test Coverage

This release brings our test suite to 898 tests with 1,706 assertions, covering:

• 47 tests for W3C tracestate support
• 38 tests for DatadogTransport
• 41 tests for FileTransport
• 29 tests for VestigErrorBoundary
• 15 tests for offline queue persistence
• Comprehensive React hooks tests for @vestig/next/client

Breaking Changes

None! v0.7.0 is fully backward compatible with v0.6.x.

Upgrade

1bun add vestig@latest
2bun add @vestig/next@latest  # If using Next.js

What's Next

We're working on v0.8.0 which will bring:

• OpenTelemetry Bridge - Export Vestig traces to OTLP collectors
• Trace Visualization - ASCII waterfall diagrams in the console
• Baggage Propagation - W3C Baggage header support
• Browser Performance Marks - Integration with Performance API

Thank You

Thank you to everyone who has tried Vestig, reported issues, and provided feedback. We're building observability that's actually enjoyable to use.

Links:

• GitHub Repository
• Documentation
• v0.7.0 Release Notes