# Deno v1.34.2 — Release & Upgrade Intelligence
- **Product:** Deno (https://deno.com)
- **Version:** v1.34.2
- **Released:** Jun 09, 2023
- **Impact Score:** 5/10
- **Breaking Changes:** Not verified
- **Canonical Analysis:** https://changelogs.us/deno/updates/v1.34.2/

## Executive Summary (TL;DR)
Deno v1.34.2. Source highlight: fix: do not show cache initialization errors if stderr is piped (#18920)

## New Features
- perf(ext/http): Add a sync phase to http serving (#19321)

## Improvements
- perf(cli): conditionally load typescript declaration files (#19392)
- perf(ext/http): Migrate op_http_get_request_headers to v8::Array (#19354)
- perf(ext/http): Migrate op_http_get_request_method_and_url to v8::Array
- perf(ext/http): Use flat list of headers for multiple set/get methods (#19336)
- perf(ext/websocket): Make send sync for non-stream websockets (#19376)
- perf(ext/websocket): Reduce GC pressure & monomorpize op_ws_next_event

## Bug Fixes
- fix: do not show cache initialization errors if stderr is piped (#18920)
- fix: upgrade to deno_ast 0.27 (#19375)
- fix(cli): formatting bench with colors (#19323)
- fix(ext/console): fix inspecting large ArrayBuffers (#19373)
- fix(ext/crypto): fix JWK import of Ed25519 (#19279)
- fix(ext/web): Copy EventTarget list before dispatch (#19360)