# Deno v1.34.0 — Release & Upgrade Intelligence
- **Product:** Deno (https://deno.com)
- **Version:** v1.34.0
- **Released:** May 25, 2023
- **Impact Score:** 7/10
- **Breaking Changes:** Source flagged
- **Canonical Analysis:** https://changelogs.us/deno/updates/v1.34.0/

## Executive Summary (TL;DR)
Deno v1.34.0. Source highlight: BREAKING(unstable): change return type of Deno.serve() API (#19189)

## Breaking Changes & Deprecations
- - BREAKING(unstable): change return type of Deno.serve() API (#19189)

## New Features
- feat(cli): add `nodeModulesDir` option to config file (#19095)
- feat(cli): top-level `exclude` field in `deno.json` (#17778)
- feat(ext/fs): add isBlockDevice, isCharDevice, isFifo, isSocket to FileInfo
- feat(ext/http): Add support for trailers w/internal API (HTTP/2 only) (#19182)
- feat(ext/http): Brotli Compression (#19216)
- feat(ext/http): ref/unref for server (#19197)

## Bug Fixes
- fix(ext/node): ClientRequest.setTimeout(0) should remove listeners (#19240)
- fix(ext/node): add basic node:worker_threads support (#19192)
- fix(ext/web): improve timers resolution for 0ms timeouts (#19212)
- fix(napi): add napi_async_init and napi_async_destroy (#19234)
- fix(node): add http.Server.unref() (#19201)
- fix(node): duplicate node_module suffixes (#19222)