Deno v1.42.0 — 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.

Compatibility not verified — check source notes

📄 .MD

✨ Features 6 ⚡ Improvements 1 🔧 Bug Fixes 6

⚡ Executive Summary (TL;DR)

Deno v1.42.0. Source highlight: feat(add): always produce multiline config file (#23077)

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Who Does This Impact? (Role-Based Analysis)

💻 Software Engineers & Devs

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📊 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 (6)

feat(add): always produce multiline config file (#23077)
feat(ext/node): add riscv64 in process.arch (#23016)
feat(init): use jsr specifier for @std/assert (#23073)
feat(install): require -g / --global flag (#23060)
feat(lint): automatically opt-in packages to `jsr` lint tag (#23072)
feat(node): load ES modules defined as CJS (#22945)

⚡ Performance & Enhancements (1)

perf: warm expensive init code at snapshot time (#22714)

🔧 Bug Fixes & Patches (6)

feat(lint): `deno lint --fix` and lsp quick fixes (#22615)
fix(bench): Fix group header printing logic + don't filter out the warmup
fix(check): do not suggest running with `--unstable` (#23092)
fix(cli): output more detailed information for steps when using JUnit reporter
fix(cli): sanitizer should ignore count of ops started before tests begin
fix(coverage): Error if no files are included in the report (#22952)

📄 View Raw Release Notes (Original Developer Log)

### 1.42.0 / 2024.03.28 - feat(add): always produce multiline config file (#23077) - feat(ext/node): add riscv64 in process.arch (#23016) - feat(init): use jsr specifier for @std/assert (#23073) - feat(install): require -g / --global flag (#23060) - feat(lint): `deno lint --fix` and lsp quick fixes (#22615) - feat(lint): automatically opt-in packages to `jsr` lint tag (#23072) - feat(node): load ES modules defined as CJS (#22945) - feat(publish): check for uncommitted files in `deno publish --dry-run` (#22981) - feat(task): Task description in the form of comments (#23101) - feat(task): cross-platform shebang support (#23091) - feat(unstable/publish): error when a package's module is excluded from publishing (#22948) - feat: TypeScript 5.4 (#23086) - feat: add `--watch-exclude` flag (#21935) - feat: deno_task_shell 0.15 (#23019) - feat: remove deprecated methods from namespace with `DENO_FUTURE=1` (#23075) - feat: type declarations for new Set methods (#23090) - fix(bench): Fix group header printing logic + don't filter out the warmup benchmark (#23083) - fix(check): do not suggest running with `--unstable` (#23092) - fix(cli): output more detailed information for steps when using JUnit reporter (#22797) - fix(cli): sanitizer should ignore count of ops started before tests begin (#22932) - fix(coverage): Error if no files are included in the report (#22952) - fix(ext/fetch): do not truncate field value in `EventSource` (#22368) - fix(ext/fetch): make `EventSource` more robust (#22493) - fix(ext/node): ECDH.publicKey() point encoding (#23013) - fix(ext/node): FsWatcher ref and unref (#22987) - fix(ext/node): Reimplement StringDecoder to match node's behavior (#22933) - fix(ext/node): add crypto.getRandomValues (#23028) - fix(ext/node): add crypto.subtle (#23027) - fix(ext/node): add process.setSourceMapsEnabled noop (#22993) - fix(ext/node): handle KeyObject in `prepareAsymmetricKey` (#23026) - fix(ext/node): handle `null` in stdio array (#23048) - fix(ext/node): implement EventEmitterAsyncResource (#22994) - fix(ext/node): implement v8 serialize and deserialize (#22975) - fix(ext/node): panic in `op_node_ecdh_generate_keys` (#23011) - fix(ext/node): pass normalized watchFile handler to StatWatcher (#22940) - fix(ext/node): spread args in setImmediate (#22998) - fix(ext/node): support Diffie-Hellman key type in `crypto.createPrivateKey()` (#22984) - fix(ext/node): support MessagePort in `WorkerOptions.workerData` (#22950) - fix(ext/node): support public key point encoding in ECDH.generateKeys() (#22976) - fix(ext/node): worker_threads ESM handling (#22841) - fix(ext/node): worker_threads doesn't exit if there are message listeners (#22944) - fix(ext/web): Fix structuredClone Web API type declaration (any -> generic) (#22968) - fix(jupyter): Do not increase counter if store_history=false (#20848) - fix(lsp): decoding percent-encoding(non-ASCII) file path correctly (#22582) - fix(lsp): prefer cache over tsc quick fixes (#23093) - fix(lsp): use registry cache for completion search (#23094) - fix(runtime): use FQDN in NetDescriptor (#23084) - fix: do not memoize `Deno.ppid` (#23006) - fix: don't panic in test and bench if ops not available (#23055) - fix: handle cache body file not existing when using etag (#22931) - fix: less aggressive vendor folder ignoring (#23100) - perf: warm expensive init code at snapshot time (#22714)

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