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Node.js 18 ChangeLog

Current
18.0.0

2022-04-19, Version 18.0.0 (Current), @BethGriggs

Node.js 18 is here! Highlights include the update of the V8 JavaScript engine to 10.1, global fetch enabled by default, and a core test runner module.

Initially, Node.js 18 will replace Node.js 17 as our ‘Current’ release line. As per the release schedule, Node.js 18 will be the ‘Current’ release for the next 6 months and then promoted to Long-term Support (LTS) in October 2022. Once promoted to long-term support the release will be designated the codename ‘Hydrogen’. Node.js 18 will be supported until April 2025.

Notable Changes

Deprecations and Removals

  • (SEMVER-MAJOR) fs: runtime deprecate string coercion in fs.write, fs.writeFileSync (Livia Medeiros) #42607
  • (SEMVER-MAJOR) dns: remove dns.lookup and dnsPromises.lookup options type coercion (Antoine du Hamel) #41431
  • (SEMVER-MAJOR) process: runtime deprecate multipleResolves (Benjamin Gruenbaum) #41896
  • (SEMVER-MAJOR) stream: remove thenable support (Robert Nagy) #40773
  • (SEMVER-MAJOR) tls: move tls.parseCertString to end-of-life (Tobias Nießen) #41479

fetch (experimental)

An experimental fetch API is available on the global scope by default. The implementation is based upon undici, an HTTP/1.1 client written for Node.js by contributors to the project.

const res = await fetch('https://nodejs.org/api/documentation.json');
if (res.ok) {
  const data = await res.json();
  console.log(data);
}

Through this addition, the following globals are made available: fetch, FormData, Headers, Request, Response.

Disable this API with the --no-experimental-fetch command-line flag.

Contributed by Michaël Zasso in #41811.

HTTP Timeouts

server.headersTimeout which limits the amount of time the parser will wait to receive the complete HTTP headers is now set to 60000 (60 seconds) by default.

server.requestTimeout which sets the timeout value in milliseconds for receiving the entire request from the client is now set to 300000 (5 minutes) by default.

If these timeouts expire, the server responds with status 408 without forwarding the request to the request listener and then closes the connection.

Both timeouts must be set to a non-zero value to protect against potential Denial-of-Service attacks in case the server is deployed without a reverse proxy in front.

Contributed by Paolo Insogna in #41263.

Test Runner module (experimental)

The node:test module facilitates the creation of JavaScript tests that report results in TAP format. To access it:

import test from 'node:test';

This module is only available under the node: scheme.

The following is an example implementation of a parent test with two subtests:

test('top level test', async (t) => {
  await t.test('subtest 1', (t) => {
    assert.strictEqual(1, 1);
  });

  await t.test('subtest 2', (t) => {
    assert.strictEqual(2, 2);
  });
});

Read more in https://nodejs.org/dist/latest-v18.x/docs/api/test.html.

Contributed by Colin Ihrig in #42325.

Toolchain and Compiler Upgrades

  • Prebuilt binaries for Linux are now built on Red Hat Enterprise Linux (RHEL) 8 and are compatible with Linux distributions based on glibc 2.28 or later, for example, Debian 10, RHEL 8, Ubuntu 20.04.
  • Prebuilt binaries for macOS now require macOS 10.15 or later.
  • For AIX the minimum supported architecture has been raised from Power 7 to Power 8.

Prebuilt binaries for 32-bit Windows will initially not be available due to issues building the V8 dependency in Node.js. We hope to restore 32-bit Windows binaries for Node.js 18 with a future V8 update.

Node.js does not support running on operating systems that are no longer supported by their vendor. For operating systems where their vendor has planned to end support earlier than April 2025, such as Windows 8.1 (January 2023) and Windows Server 2012 R2 (October 2023), support for Node.js 18 will end at the earlier date.

Full details about the supported toolchains and compilers are documented in the Node.js BUILDING.md file.

Contributed by Richard Lau in #42292, #42604 and #42659,and Michaël Zasso in #42105 and #42666.

V8 10.1

The V8 engine is updated to version 10.1, which is part of Chromium 101. Compared to the version included in Node.js 17.9.0, the following new features are included:

The data format returned by the serialization API (v8.serialize(value)) has changed, and cannot be deserialized by earlier versions of Node.js. On the other hand, it is still possible to deserialize the previous format, as the API is backwards-compatible.

Contributed by Michaël Zasso in #42657.

Web Streams API (experimental)

Node.js now exposes the experimental implementation of the Web Streams API on the global scope. This means the following APIs are now globally available:

  • ReadableStream, ReadableStreamDefaultReader, ReadableStreamBYOBReader, ReadableStreamBYOBRequest, ReadableByteStreamController, ReadableStreamDefaultController, TransformStream, TransformStreamDefaultController, WritableStream, WritableStreamDefaultWriter, WritableStreamDefaultController, ByteLengthQueuingStrategy, CountQueuingStrategy, TextEncoderStream, TextDecoderStream, CompressionStream, DecompressionStream.

Contributed James Snell in #39062, and Antoine du Hamel in #42225.

Other Notable Changes

  • (SEMVER-MAJOR) buffer: expose Blob as a global (James M Snell) #41270
  • (SEMVER-MAJOR) child_process: improve argument validation (Rich Trott) #41305
  • doc: add RafaelGSS to collaborators (RafaelGSS) #42718
  • (SEMVER-MAJOR) http: make TCP noDelay enabled by default (Paolo Insogna) #42163
  • (SEMVER-MAJOR) net: make server.address() return an integer for family (Antoine du Hamel) #41431
  • (SEMVER-MAJOR) worker: expose BroadcastChannel as a global (James M Snell) #41271
  • (SEMVER-MAJOR) worker: graduate BroadcastChannel to supported (James M Snell) #41271

Semver-Major Commits

  • [dab8ab2837] - (SEMVER-MAJOR) assert,util: compare RegExp.lastIndex while using deep equal checks (Ruben Bridgewater) #41020
  • [cff14bcaef] - (SEMVER-MAJOR) buffer: refactor byteLength to remove outdated optimizations (Rongjian Zhang) #38545
  • [cea76dbf33] - (SEMVER-MAJOR) buffer: expose Blob as a global (James M Snell) #41270
  • [99c18f4786] - (SEMVER-MAJOR) buffer: graduate Blob from experimental (James M Snell) #41270
  • [35d72bf4ec] - (SEMVER-MAJOR) build: make x86 Windows support temporarily experimental (Michaël Zasso) #42666
  • [1134d8faf8] - (SEMVER-MAJOR) build: bump macOS deployment target to 10.15 (Richard Lau) #42292
  • [27eb91d378] - (SEMVER-MAJOR) build: downgrade Windows 8.1 and server 2012 R2 to experimental (Michaël Zasso) #42105
  • [26c973d4b3] - (SEMVER-MAJOR) child_process: improve argument validation (Rich Trott) #41305
  • [38007df999] - (SEMVER-MAJOR) cluster: make kill to be just process.kill (Bar Admoni) #34312
  • [aed18dfe59] - (SEMVER-MAJOR) crypto: cleanup validation (Mohammed Keyvanzadeh) #39841
  • [e1fb6ae02f] - (SEMVER-MAJOR) crypto: prettify othername in PrintGeneralName (Tobias Nießen) #42123
  • [36fb79030e] - (SEMVER-MAJOR) crypto: fix X509Certificate toLegacyObject (Tobias Nießen) #42124
  • [563b2ed000] - (SEMVER-MAJOR) crypto: use RFC2253 format in PrintGeneralName (Tobias Nießen) #42002
  • [18365d8ee6] - (SEMVER-MAJOR) crypto: change default check(Host|Email) behavior (Tobias Nießen) #41600
  • [58f3fdcccd] - (SEMVER-MAJOR) deps: V8: cherry-pick semver-major commits from 10.2 (Michaël Zasso) #42657
  • [fd4f80ce54] - (SEMVER-MAJOR) deps: update V8 to 10.1.124.6 (Michaël Zasso) #42657
  • [974ab4060f] - (SEMVER-MAJOR) deps: update V8 to 9.8.177.9 (Michaël Zasso) #41610
  • [270253c4e2] - (SEMVER-MAJOR) deps: update V8 to 9.7.106.18 (Michaël Zasso) #40907
  • [08773e3c04] - (SEMVER-MAJOR) dns: remove dns.lookup and dnsPromises.lookup options type coercion (Antoine du Hamel) #41431
  • [3671cc0432] - (SEMVER-MAJOR) doc: update minimum glibc requirements for Linux (Richard Lau) #42659
  • [646e057680] - (SEMVER-MAJOR) doc: update AIX minimum supported arch (Richard Lau) #42604
  • [0bac5478eb] - (SEMVER-MAJOR) fs: runtime deprecate string coercion in fs.write, fs.writeFileSync (Livia Medeiros) #42607
  • [3caa2c1a00] - (SEMVER-MAJOR) http: refactor headersTimeout and requestTimeout logic (Paolo Insogna) #41263
  • [eacd45656a] - (SEMVER-MAJOR) http: make TCP noDelay enabled by default (Paolo Insogna) #42163
  • [4944ad0b9e] - (SEMVER-MAJOR) lib: enable fetch by default (Michaël Zasso) #41811
  • [8c4b8b201a] - (SEMVER-MAJOR) lib: replace validator and error (Mohammed Keyvanzadeh) #41678
  • [3c4ee5267a] - (SEMVER-MAJOR) module,repl: support 'node:'-only core modules (Colin Ihrig) #42325
  • [3a26db9697] - (SEMVER-MAJOR) net: make server.address() return an integer for family (Antoine du Hamel) #41431
  • [e6a7300a10] - (SEMVER-MAJOR) process: disallow some uses of Object.defineProperty() on process.env (Himself65) #28006
  • [60b8e79599] - (SEMVER-MAJOR) process: runtime deprecate multipleResolves (Benjamin Gruenbaum) #41896
  • [d36b60e69a] - (SEMVER-MAJOR) readline: fix question still called after closed (Xuguang Mei) #42464
  • [58e645de63] - (SEMVER-MAJOR) stream: remove thenable support (Robert Nagy) #40773
  • [560cbc5849] - (SEMVER-MAJOR) stream: expose web streams globals, remove runtime experimental warning (Antoine du Hamel) #42225
  • [9fb7ac3bbd] - (SEMVER-MAJOR) stream: need to cleanup event listeners if last stream is readable (Xuguang Mei) #41954
  • [ceaa299958] - (SEMVER-MAJOR) stream: revert revert map spec compliance (Benjamin Gruenbaum) #41933
  • [fe7ca085a7] - (SEMVER-MAJOR) stream: throw invalid arg type from End Of Stream (Jithil P Ponnan) #41766
  • [48e784043d] - (SEMVER-MAJOR) stream: don't emit finish after destroy (Robert Nagy) #40852
  • [f2170253b6] - (SEMVER-MAJOR) stream: add errored and closed props (Robert Nagy) #40696
  • [432d1b50e0] - (SEMVER-MAJOR) test: add initial test module (Colin Ihrig) #42325
  • [92567283f4] - (SEMVER-MAJOR) timers: refactor internal classes to ES2015 syntax (Rabbit) #37408
  • [65910c0d6c] - (SEMVER-MAJOR) tls: represent registeredID numerically always (Tobias Nießen) #41561
  • [807c7e14f4] - (SEMVER-MAJOR) tls: move tls.parseCertString to end-of-life (Tobias Nießen) #41479
  • [f524306077] - (SEMVER-MAJOR) url: throw on NULL in IPv6 hostname (Rich Trott) #42313
  • [0187bc5cdc] - (SEMVER-MAJOR) v8: make v8.writeHeapSnapshot() error codes consistent (Darshan Sen) #42577
  • [74b9baa426] - (SEMVER-MAJOR) v8: make writeHeapSnapshot throw if fopen fails (Antonio Román) #41373
  • [ce4d3adf50] - (SEMVER-MAJOR) worker: expose BroadcastChannel as a global (James M Snell) #41271
  • [6486a304d3] - (SEMVER-MAJOR) worker: graduate BroadcastChannel to supported (James M Snell) #41271

Semver-Minor Commits

  • [415726b8c4] - (SEMVER-MINOR) stream: add writableAborted (Robert Nagy) #40802
  • [54819f08e0] - (SEMVER-MINOR) test_runner: support 'only' tests (Colin Ihrig) #42514

Semver-Patch Commits