Deno v1.5.2 — 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.

Compatibility not verified — check source notes

📄 .MD

✨ Features 2 🔧 Bug Fixes 6

⚡ Executive Summary (TL;DR)

Deno v1.5.2. Source highlight: fix(core/error): Remove extra newline from JsError::fmt() (#8145)

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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.

✨ New Features & Capabilities (2)

feat(std/node/fs): add realpath and realpathSync (#8169)
feat(std/wasi): add start method to Context (#8141)

🔧 Bug Fixes & Patches (6)

fix(core/error): Remove extra newline from JsError::fmt() (#8145)
fix(op_crates/web): make TextEncoder work with forced non-strings (#8206)
fix(op_crates/web): fix URLSearchParams, malformed url handling (#8092)
fix(op_crates/web): define abort event handler on prototype (#8230)
fix(cli/repl): Fixing syntax highlighting (#8202)
fix: inject helpers when transpiling via swc (#8221)

📄 View Raw Release Notes (Original Developer Log)

### 1.5.2 / 2020.11.09 - fix(core/error): Remove extra newline from JsError::fmt() (#8145) - fix(op_crates/web): make TextEncoder work with forced non-strings (#8206) - fix(op_crates/web): fix URLSearchParams, malformed url handling (#8092) - fix(op_crates/web): define abort event handler on prototype (#8230) - fix(cli/repl): Fixing syntax highlighting (#8202) - fix: inject helpers when transpiling via swc (#8221) - fix: add commit hash and target to long_version output (#8133) - fix: correct libs sent to tsc for unstable worker (#8260) - fix: properly handle type checking root modules with type definitions (#8263) - fix: allow remapping to locals for import map (#8262) - fix: ensure that transitory dependencies are emitted (#8275) - fix: make onabort event handler web compatible (#8225) - fix: display of non-ASCII characters on Windows (#8199) - refactor: Cleanup Flags to Permissions conversion (#8213) - refactor: migrate runtime compile/bundle to new infrastructure (#8192) - refactor: cleanup compiler snapshot and tsc/module_graph (#8220) - refactor: remove ProgramState::permissions (#8228) - refactor: refactor file_fetcher (#8245) - refactor: rewrite permission_test to not depend on Python (#8291) - refactor: auto detect target triples for upgrade (#8286) - build: migrate to dlint (#8176) - build: remove eslint (#8232) - build: rewrite tools/ scripts to deno (#8247) - build: full color ci logs (#8280) - upgrade: TypeScript to 4.0.5 (#8138) - upgrade: deno_doc, deno_lint, dprint, swc (#8292) Changes in std version 0.77.0: - feat(std/node/fs): add realpath and realpathSync (#8169) - feat(std/wasi): add start method to Context (#8141) - fix(std/flags): Fix parse incorrectly parsing alias flags with equals (#8216) - fix(std/node): only define Node.js globals when loading std/node/global (#8281) ### Install / Upgrade **Using Deno:** ```sh deno upgrade --version 1.5.2 ``` **With Shell:** ```sh curl -fsSL https://deno.land/x/install/install.sh | sh -s v1.5.2 ``` **With PowerShell:** ```powershell $v="1.5.2"; iwr https://deno.land/x/install/install.ps1 -useb | iex ```

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