# Deno v1.15.0 — Release & Upgrade Intelligence
- **Product:** Deno (https://deno.com)
- **Version:** v1.15.0
- **Released:** Oct 12, 2021
- **Impact Score:** 5/10
- **Breaking Changes:** Not verified
- **Canonical Analysis:** https://changelogs.us/deno/updates/v1.15.0/

## Executive Summary (TL;DR)
Deno v1.15.0. Source highlight: feat: add --compat flag to provide built-in Node modules (#12293)

## New Features
- feat: add --compat flag to provide built-in Node modules (#12293)
- feat: provide ops details for ops sanitizer failures (#12188)
- feat: Show the URL of streaming WASM modules in stack traces (#12268)
- feat: Stabilize Deno.kill and Deno.Process.kill (#12375)
- feat: stabilize Deno.resolveDns (#12368)
- feat: stabilize URLPattern API (#12256)

## Improvements
- perf(core): use opcall() directly (#12310)
- perf(fetch): fast path Uint8Array in extractBody() (#12351)
- perf(fetch): optimize fillHeaders() key iteration (#12287)
- perf(web): ~400x faster http header trimming (#12277)
- perf(web): optimize byteLowerCase() (#12282)
- perf(web/Event): move last class field to constructor (#12265)

## Bug Fixes
- fix: Don't panic when a worker is closed in the reactions to a wasm operation (#12270)
- fix: worker environment permissions should accept an array (#12250)
- fix(core/runtime): sync_ops_cache if nuked Deno ns (#12302)
- fix(ext/crypto): decode id-RSASSA-PSS with default params (#12147)
- fix(ext/crypto): key generation based on AES key length (#12146)
- fix(ext/crypto): missing Aes key typings (#12307)