⚠️ Breaking Change
Impact Score: 7/10
Deno v1.6.0 — Release Notes & Engineering Impact
Source available — automated, not human-reviewed
Component: deno · Channel: stable. Automated analysis, not a compatibility certification. How this works.
Analysis updated: 2026-11-01.
Breaking-change evidence from the source
- BREAKING: Make "isolatedModules" setting non-configurable (#8482)
- BREAKING(std/bytes): Adjust APIs based on std-wg discussion (#8612)
⚡ Executive Summary (TL;DR)
Deno v1.6.0. Source highlight: BREAKING: Make "isolatedModules" setting non-configurable (#8482)
Who Does This Impact? (Role-Based Analysis)
💻 Software Engineers & Devs
Check the source notes against the package and APIs you use before upgrading.
📊 Product & Engineering Leads
Use the documented changes to assess relevance to your product; release frequency alone is not a quality measure.
⚙️ DevOps & Security
Verify the target version, runtime requirements and rollback procedure in the official documentation.
⚠️ Breaking Changes & Deprecations (2)
- - BREAKING: Make "isolatedModules" setting non-configurable (#8482)
- - BREAKING(std/bytes): Adjust APIs based on std-wg discussion (#8612)
✨ New Features & Capabilities (6)
- feat: Add mvp language server (#8515, #8651)
- feat: deno compile (#8539, #8563, #8581)
- feat: Update to TypeScript 4.1 (#7573)
- feat: EventTarget signal support (#8616)
- feat: Add canary support to upgrade subcommand (#8476)
- feat(unstable): Add cbreak option to Deno.setRaw (#8383)
⚡ Performance & Enhancements (1)
- perf: Use minimal op with performance.now() (#8619)
🔧 Bug Fixes & Patches (6)
- fix: "onload" event order (#8376)
- fix: Add file URL support for Deno.readLink (#8423)
- fix: Add hygiene pass to transpile pipeline (#8586)
- fix: Require allow-write permissions for unixpackets datagrams & unix socket
- fix: Highlight `async` and `of` in REPL (#8569)
- fix: Make output of deno info --json deterministic (#8483)
📄 View Raw Release Notes (Original Developer Log)
### 1.6.0 / 2020.12.08
- BREAKING: Make "isolatedModules" setting non-configurable (#8482)
- feat: Add mvp language server (#8515, #8651)
- feat: deno compile (#8539, #8563, #8581)
- feat: Update to TypeScript 4.1 (#7573)
- feat: EventTarget signal support (#8616)
- feat: Add canary support to upgrade subcommand (#8476)
- feat(unstable): Add cbreak option to Deno.setRaw (#8383)
- fix: "onload" event order (#8376)
- fix: Add file URL support for Deno.readLink (#8423)
- fix: Add hygiene pass to transpile pipeline (#8586)
- fix: Require allow-write permissions for unixpackets datagrams & unix socket
(#8511)
- fix: Highlight `async` and `of` in REPL (#8569)
- fix: Make output of deno info --json deterministic (#8483)
- fix: Panic in worker when closing at top level (#8510)
- fix: Support passing cli arguments under `deno eval` (#8547)
- fix: `redirect: "manual"` fetch should return `type: "default"` response
(#8353)
- fix: close() calls sometimes prints results in REPL (#8558)
- fix: watcher doesn't exit when module resolution fails (#8521)
- fix: Fix PermissionDenied error being caught in Websocket constructor (#8402)
- fix: Set User-Agent header in Websocket (#8502, #8470)
- perf: Use minimal op with performance.now() (#8619)
- core: Implement new ResourceTable (#8273)
- core: Add FsModuleLoader that supports loading from filesystem (#8523)
- upgrade rusty_v8 to 0.14.0 (#8663)
- upgrade: deno_doc, deno_lint, dprint, swc (#8552, #8575, #8588)
Changes in std version 0.80.0:
- BREAKING(std/bytes): Adjust APIs based on std-wg discussion (#8612)
- feat(std/encoding/csv): Add stringify functionality (#8408)
- feat(std/fs): Re-enable `followSymlinks` on `walk()` (#8479)
- feat(std/http): Add Cookie value validation (#8471)
- feat(std/node): Add "setImmediate" and "clearImmediate" to global scope
(#8566)
- feat(std/node): Port most of node errors (#7934)
- feat(std/node/stream): Add Duplex, Transform, Passthrough, pipeline, finished
and promises (#7940)
- feat(std/wasi): Add return on exit option (#8605)
- feat(std/wasi): Add support for initializing reactors (#8603)
- feat(std/ws): protocol & version support (#8505)
- fix(std/bufio): Remove '\r' at the end of Windows lines (#8447)
- fix(std/encoding): Rewrite toml parser not to use eval() (#8624)
- fix(std/encoding/csv): Correct readme formatting due to dprint issues (#8503)
- fix(std/http): Prevent path traversal (#8474)
- fix(std/node): Inline default objects to ensure correct prototype (#8513)
### Install / Upgrade
**Using Deno:**
```sh
deno upgrade --version 1.6.0
```
**With Shell:**
```sh
curl -fsSL https://deno.land/x/install/install.sh | sh -s v1.6.0
```
**With PowerShell:**
```powershell
$v="1.6.0"; iwr https://deno.land/x/install/install.ps1 -useb | iex
```