Node v21.1.0 (Current)

Michaël Zasso

2023-10-24, Version 21.1.0 (Current), @targos

Notable Changes

Automatically detect and run ESM syntax

The new flag --experimental-detect-module can be used to automatically run ES modules when their syntax can be detected. For “ambiguous” files, which are .js or extensionless files with no package.json with a type field, Node.js will parse the file to detect ES module syntax; if found, it will run the file as an ES module, otherwise it will run the file as a CommonJS module. The same applies to string input via --eval or STDIN.

We hope to make detection enabled by default in a future version of Node.js. Detection increases startup time, so we encourage everyone — especially package authors — to add a type field to package.json, even for the default "type": "commonjs". The presence of a type field, or explicit extensions such as .mjs or .cjs, will opt out of detection.

Contributed by Geoffrey Booth in #50096.

vm: fix V8 compilation cache support for vm.Script

Previously repeated compilation of the same source code using vm.Script stopped hitting the V8 compilation cache after v16.x when support for importModuleDynamically was added to vm.Script, resulting in a performance regression that blocked users (in particular Jest users) from upgrading from v16.x.

The recent fixes landed in v21.1.0 allow the compilation cache to be hit again for vm.Script when --experimental-vm-modules is not used even in the presence of the importModuleDynamically option, so that users affected by the performance regression can now upgrade. Ongoing work is also being done to enable compilation cache support for vm.CompileFunction.

Contributed by Joyee Cheung in https://github.com/nodejs/node/pull/50137

Other Notable Changes

[3729e33358] - doc: add H4ad to collaborators (Vinícius Lourenço) #50217
[18862e4d5d] - (SEMVER-MINOR) fs: add flush option to appendFile() functions (Colin Ihrig) #50095
[5a52c518ef] - (SEMVER-MINOR) lib: add navigator.userAgent (Yagiz Nizipli) #50200
[789372a072] - (SEMVER-MINOR) stream: allow pass stream class to stream.compose (Alex Yang) #50187
[f3a9ea0bc4] - stream: improve performance of readable stream reads (Raz Luvaton) #50173

Commits

[9cd68b9083] - buffer: remove unnecessary assignment in fromString (Tobias Nießen) #50199
[a362c276ec] - crypto: ensure valid point on elliptic curve in SubtleCrypto.importKey (Filip Skokan) #50234
[f4da308f8d] - deps: V8: cherry-pick f7d000a7ae7b (Luke Albao) #50302
[269e268c38] - deps: update ada to 2.7.2 (Node.js GitHub Bot) #50338
[03a31ce41e] - deps: update corepack to 0.22.0 (Node.js GitHub Bot) #50325
[000531781b] - deps: update undici to 5.26.4 (Node.js GitHub Bot) #50274
[f050668c14] - deps: update c-ares to 1.20.1 (Node.js GitHub Bot) #50082
[ba258b682b] - deps: update c-ares to 1.20.0 (Node.js GitHub Bot) #50082
[571f7ef1fa] - deps: patch V8 to 11.8.172.15 (Michaël Zasso) #50114
[943047e800] - deps: V8: cherry-pick 25902244ad1a (Joyee Cheung) #50156
[db2a1cf1cb] - doc: fix navigator.hardwareConcurrency example (Tobias Nießen) #50278
[6e537aeb44] - doc: explain how to disable navigator (Geoffrey Booth) #50310
[c40de82d62] - doc: add loong64 info into platform list (Shi Pujin) #50086
[1c21a1880b] - doc: update release process LTS step (Richard Lau) #50299
[2473aa3672] - doc: fix release process table of contents (Richard Lau) #50216
[ce9d84eae3] - doc: update api stream.compose (Alex Yang) #50206
[dacee4d9b5] - doc: add ReflectConstruct to known perf issues (Vinicius Lourenço) #50111
[82363be2ac] - doc: fix typo in dgram docs (Peter Johnson) #50211
[8c1a46c751] - doc: fix H4ad collaborator sort (Vinicius Lourenço) #50218
[3729e33358] - doc: add H4ad to collaborators (Vinícius Lourenço) #50217
[bac872cbd0] - doc: update release-stewards with last sec-release (Rafael Gonzaga) #50179
[06b7724f14] - doc: add command to keep major branch sync (Rafael Gonzaga) #50102
[47633ab086] - doc: add loong64 to list of architectures (Shi Pujin) #50172
[1f40ca1b91] - doc: update security release process (Michael Dawson) #50166
[998feda118] - esm: do not give wrong hints when detecting file format (Antoine du Hamel) #50314
[e375063e01] - (SEMVER-MINOR) esm: detect ESM syntax in ambiguous JavaScript (Geoffrey Booth) #50096
[c76eb27971] - esm: improve check for ESM syntax (Geoffrey Booth) #50127
[7740bf820c] - esm: rename error code related to import attributes (Antoine du Hamel) #50181
[0cc176ef25] - fs: improve error performance for readSync (Jungku Lee) #50033
[5942edb774] - fs: improve error performance for fsyncSync (Jungku Lee) #49880
[6ec5abadc0] - fs: improve error performance for mkdirSync (CanadaHonk) #49847
[c5ff000cb1] - fs: improve error performance of realpathSync (Yagiz Nizipli) #49962
[6eeaa02f5c] - fs: improve error performance of lchownSync (Yagiz Nizipli) #49962
[dc9ac8d41c] - fs: improve error performance of symlinkSync (Yagiz Nizipli) #49962
[bc6f279261] - fs: improve error performance of readlinkSync (Yagiz Nizipli) #49962
[275987841e] - fs: improve error performance of mkdtempSync (Yagiz Nizipli) #49962
[81f15274e2] - fs: improve error performance of linkSync (Yagiz Nizipli) #49962
[f766c04856] - fs: improve error performance of chownSync (Yagiz Nizipli) #49962
[610036c67d] - fs: improve error performance of renameSync (Yagiz Nizipli) #49962
[18862e4d5d] - (SEMVER-MINOR) fs: add flush option to appendFile() functions (Colin Ihrig) #50095
[3f8cbb15cb] - http2: allow streams to complete gracefully after goaway (Michael Lumish) #50202
[1464eba1a0] - lib: improve performance of validateStringArray and validateBooleanArray (Aras Abbasi) #49756
[5a52c518ef] - (SEMVER-MINOR) lib: add navigator.userAgent (Yagiz Nizipli) #50200
[b6021ab8f6] - lib: reduce overhead of blob clone (Vinicius Lourenço) #50110
[be19d9baa1] - meta: move Trott to TSC regular member (Rich Trott) #50297
[91e373f8e9] - node-api: return napi_exception_pending on proxy handlers (Chengzhong Wu) #48607
[531a3ae4b5] - stream: simplify prefinish (Robert Nagy) #50204
[514ac86579] - stream: reduce scope of readable bitmap details (Robert Nagy) #49963
[789372a072] - (SEMVER-MINOR) stream: allow pass stream class to stream.compose (Alex Yang) #50187
[f3a9ea0bc4] - stream: call helper function from push and unshift (Raz Luvaton) #50173
[a9ca7b32e7] - test: improve watch mode test (Moshe Atlow) #50319
[63b7059efd] - test: set test-watch-mode-inspect as flaky (Yagiz Nizipli) #50259
[7f87084b05] - Revert "test: set test-esm-loader-resolve-type as flaky" (Antoine du Hamel) #50315
[4d390e2de4] - test: replace forEach with for..of in test-http-perf_hooks.js (Niya Shiyas) #49818
[67c599ec39] - test: replace forEach with for..of in test-net-isipv4.js (Niya Shiyas) #49822
[19d3ce2494] - test: deflake test-esm-loader-resolve-type (Antoine du Hamel) #50273
[2d8d6c5701] - test: replace forEach with for..of in test-http2-server (Niya Shiyas) #49819
[af31d51e5a] - test: replace forEach with for..of in test-http2-client-destroy.js (Niya Shiyas) #49820
[465ad2a5ce] - test: update url web platform tests (Yagiz Nizipli) #50264
[3b80a6894c] - test: set test-emit-after-on-destroyed as flaky (Yagiz Nizipli) #50246
[57adbdd156] - test: set inspector async stack test as flaky (Yagiz Nizipli) #50244
[6507f66404] - test: set test-worker-nearheaplimit-deadlock flaky (StefanStojanovic) #50277
[21a6ba548d] - test: set test-cli-node-options as flaky (Yagiz Nizipli) #50296
[c55f8f30cb] - test: reduce the number of requests and parsers (Luigi Pinca) #50240
[5129bedfa2] - test: set crypto-timing test as flaky (Yagiz Nizipli) #50232
[9bc5ab5e07] - test: set test-structuredclone-* as flaky (Yagiz Nizipli) #50261
[317e447ddc] - test: deflake test-loaders-workers-spawned (Antoine du Hamel) #50251
[0c710daae2] - test: improve code coverage of diagnostics_channel (Jithil P Ponnan) #50053
[7c6e4d7ec3] - test: set test-esm-loader-resolve-type as flaky (Yagiz Nizipli) #50226
[c8744909b0] - test: set inspector async hook test as flaky (Yagiz Nizipli) #50252
[3e38001739] - test: skip test-benchmark-os.js on IBM i (Abdirahim Musse) #50208
[dd66fdfb7b] - test: set parallel http server test as flaky (Yagiz Nizipli) #50227
[a38d1311bf] - test: set test-worker-nearheaplimit-deadlock flaky (Stefan Stojanovic) #50238
[8efb75fd80] - test: set test-runner-watch-mode as flaky (Yagiz Nizipli) #50221
[143ddded74] - test: set sea snapshot tests as flaky (Yagiz Nizipli) #50223
[ae905a8f35] - test: fix defect path traversal tests (Tobias Nießen) #50124
[ce27ee701b] - tls: reduce TLS 'close' event listener warnings (Tim Perry) #50136
[ab4bae8e1f] - tools: drop support for osx notarization with gon (Ulises Gascón) #50291
[5df3d5abcc] - tools: update comment in update-uncidi.sh and acorn_version.h (Jungku Lee) #50175
[bf7b94f0b3] - tools: refactor checkimports.py (Mohammed Keyvanzadeh) #50011
[5dc454a837] - util: remove internal mime fns from benchmarks (Aras Abbasi) #50201
[8f7eb15603] - vm: use import attributes instead of import assertions (Antoine du Hamel) #50141
[dda33c2bf1] - vm: reject in importModuleDynamically without --experimental-vm-modules (Joyee Cheung) #50137
[3999362c59] - vm: use internal versions of compileFunction and Script (Joyee Cheung) #50137
[a54179f0e0] - vm: unify host-defined option generation in vm.compileFunction (Joyee Cheung) #50137
[87be790fa9] - worker: handle detached MessagePort from a different context (Juan José) #49150

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