Upgrade reported Node.js version to 26.3.0

flake.nix

@@ -31,8 +31,8 @@
         clang = pkgs.clang_21;
         lld = pkgs.lld_21;
 
-        # Node.js 24 - matching the bootstrap script (targets 24.3.0, actual version from nixpkgs-unstable)
-        nodejs = pkgs.nodejs_24;
+        # Node.js 26 - matching the bootstrap script (targets 26.3.0, actual version from nixpkgs-unstable)
+        nodejs = pkgs.nodejs_26;
 
         # Build tools and dependencies
         packages = [

scripts/bootstrap.ps1

@@ -1,4 +1,4 @@
-# Version: 19
+# Version: 21
 # A script that installs the dependencies needed to build and test Bun on Windows.
 # Supports both x64 and ARM64 using Scoop for package management.
 # Used by Azure [build images] pipeline.
@@ -215,9 +215,9 @@ function Install-Git {
 }
 
 function Install-NodeJs {
-  # Pin to match the ABI version Bun expects (NODE_MODULE_VERSION 137).
-  # Latest Node (25.x) uses ABI 141 which breaks node-gyp tests.
-  $nodejsVersion = "24.3.0"
+  # Pin to match the ABI version Bun expects (NODE_MODULE_VERSION 147).
+  # A mismatched Node ABI breaks node-gyp tests.
+  $nodejsVersion = "26.3.0"
   Install-Scoop-Package "nodejs@$nodejsVersion" -Command node
 
   # Seed node-gyp's cache so napi tests don't re-download headers + node.lib

scripts/bootstrap.sh

@@ -1,5 +1,5 @@
 #!/bin/sh
-# Version: 34
+# Version: 36
 
 # A script that installs the dependencies needed to build and test Bun.
 # This should work on macOS and Linux with a POSIX shell.
@@ -780,7 +780,7 @@ install_common_software() {
 }
 
 nodejs_version_exact() {
-	print "24.3.0"
+	print "26.3.0"
 }
 
 nodejs_version() {
@@ -819,7 +819,11 @@ install_nodejs() {
 
 	case "$abi" in
 	musl)
-		nodejs_mirror="https://bun-nodejs-release.s3.us-west-1.amazonaws.com"
+		# nodejs.org doesn't publish musl binaries; the unofficial-builds
+		# project (nodejs/unofficial-builds) ships both x64-musl and
+		# arm64-musl for current releases. (The old private S3 mirror at
+		# bun-nodejs-release predates arm64-musl being available there.)
+		nodejs_mirror="https://unofficial-builds.nodejs.org/download/release"
 		nodejs_foldername="node-v$nodejs_version-$nodejs_platform-$nodejs_arch-musl"
 		;;
 	*)
@@ -1450,21 +1454,27 @@ install_windows_sysroot() {
 
 	execute_sudo rm -rf "$sysroot"
 	execute_sudo mkdir -p "$sysroot"
+	# The cache must live on the same filesystem as the output: splat moves
+	# unpacked files with rename(2), which fails with EXDEV (cross-device
+	# link) when the download dir is on tmpfs and /opt is not.
+	xwin_cache="$sysroot.cache"
+	execute_sudo rm -rf "$xwin_cache"
+	execute_sudo mkdir -p "$xwin_cache"
 	# Both target arches in one splat; --include-debug-libs so /MTd (debug
 	# CRT) links work; --include-atl for <atlstr.h> (rescle.cpp);
 	# winsysroot-style + MS arch notation so clang-cl and lld-link resolve it
 	# with a single /winsysroot flag; symlinks stay ON (default) to fix
 	# include/lib casing on a case-sensitive filesystem.
 	# stdout is dropped: xwin draws progress bars there even without a TTY,
 	# which floods the image-build log. Errors stay on stderr.
-	execute_sudo "$xwin_dir/xwin" --accept-license --arch x86_64,aarch64 --sdk-version 10.0.26100 --crt-version 14.44.17.14 --include-atl --cache-dir "$xwin_dir/cache" \
+	execute_sudo "$xwin_dir/xwin" --accept-license --arch x86_64,aarch64 --sdk-version 10.0.26100 --crt-version 14.44.17.14 --include-atl --cache-dir "$xwin_cache" \
 		splat --use-winsysroot-style --preserve-ms-arch-notation --include-debug-libs \
 		--output "$sysroot" >/dev/null
 	# clang-cl/lld-link compose SDK paths as "Include"/"Lib" (title case);
 	# the winsysroot-style splat writes lowercase — alias both spellings.
 	execute_sudo ln -s include "$sysroot/Windows Kits/10/Include"
 	execute_sudo ln -s lib "$sysroot/Windows Kits/10/Lib"
-	execute_sudo rm -rf "$xwin_dir"
+	execute_sudo rm -rf "$xwin_dir" "$xwin_cache"
 	# No WINDOWS_SYSROOT export — detectWindowsSysroot() picks up
 	# /opt/winsysroot by well-known path.
 }

scripts/build/codegen.ts

@@ -763,6 +763,10 @@ function emitJsModules({ n, cfg, sources, o, dirStamp }: Ctx): void {
 
   // InternalModuleRegistry.cpp is read by the script (for a sanity check).
   const extraInput = resolve(cfg.cwd, "src", "jsc", "bindings", "InternalModuleRegistry.cpp");
+  // replacements.ts bakes ErrorCode.ts indices into every bundled module
+  // ($makeErrorWithCode(N, ...)); without this dep an ErrorCode.ts edit leaves
+  // stale error numbers in the JS bundles while the C++ enum regenerates.
+  const errorCodeInput = resolve(cfg.cwd, "src", "jsc", "bindings", "ErrorCode.ts");
 
   // Written into src/ (not codegenDir) — see zigFilesGeneratedIntoSrc at top.
   const js2nativeZig = resolve(cfg.cwd, zigFilesGeneratedIntoSrc[1]);
@@ -791,7 +795,7 @@ function emitJsModules({ n, cfg, sources, o, dirStamp }: Ctx): void {
   n.build({
     outputs,
     rule: "codegen",
-    inputs: [script, ...sources.js, ...sources.jsCodegen, extraInput],
+    inputs: [script, ...sources.js, ...sources.jsCodegen, extraInput, errorCodeInput],
     orderOnlyInputs: [dirStamp],
     vars: {
       cwd: cfg.cwd,

scripts/build/config.ts

@@ -10,7 +10,7 @@ import { execSync } from "node:child_process";
 import { existsSync, mkdirSync, readdirSync, readFileSync, realpathSync, symlinkSync } from "node:fs";
 import { homedir, arch as hostArch, platform as hostPlatform } from "node:os";
 import { dirname, isAbsolute, join, relative, resolve, sep } from "node:path";
-import { NODEJS_ABI_VERSION, NODEJS_VERSION } from "./deps/nodejs-headers.ts";
+import { NODEJS_ABI_VERSION, NODEJS_V8_VERSION, NODEJS_VERSION } from "./deps/nodejs-headers.ts";
 import { WEBKIT_VERSION } from "./deps/webkit.ts";
 import { assert, BuildError } from "./error.ts";
 import { resolveMacosSdkPath } from "./macos-sdk.ts";
@@ -61,6 +61,7 @@ export interface Host {
 const versionDefaults = {
   nodejsVersion: NODEJS_VERSION,
   nodejsAbiVersion: NODEJS_ABI_VERSION,
+  nodejsV8Version: NODEJS_V8_VERSION,
   webkitVersion: WEBKIT_VERSION,
 };
 
@@ -307,6 +308,7 @@ export interface Config {
   /** Node.js compat version. Default in versions.ts; override to test a bump. */
   nodejsVersion: string;
   nodejsAbiVersion: string;
+  nodejsV8Version: string;
   /** WebKit commit. Default in versions.ts; override to test a WebKit branch. */
   webkitVersion: string;
 }
@@ -368,6 +370,7 @@ export interface PartialConfig {
   // Version pins (defaults in versions.ts).
   nodejsVersion?: string;
   nodejsAbiVersion?: string;
+  nodejsV8Version?: string;
   webkitVersion?: string;
 }
 
@@ -1019,6 +1022,7 @@ export function resolveConfig(partial: PartialConfig, toolchain: Toolchain): Con
   // to test a branch before bumping the pinned default.
   const nodejsVersion = partial.nodejsVersion ?? versionDefaults.nodejsVersion;
   const nodejsAbiVersion = partial.nodejsAbiVersion ?? versionDefaults.nodejsAbiVersion;
+  const nodejsV8Version = partial.nodejsV8Version ?? versionDefaults.nodejsV8Version;
   const webkitVersion = partial.webkitVersion ?? versionDefaults.webkitVersion;
 
   // ─── macOS SDK ───
@@ -1180,6 +1184,7 @@ export function resolveConfig(partial: PartialConfig, toolchain: Toolchain): Con
     version,
     revision,
     nodejsVersion,
+    nodejsV8Version,
     nodejsAbiVersion,
     canaryRevision,
     webkitVersion,

scripts/build/deps/nodejs-headers.ts

@@ -14,10 +14,13 @@ import type { Dependency } from "../source.ts";
  * download URL, and passed to zig as -Dreported_nodejs_version.
  * Override via `--nodejs-version=X.Y.Z` to test a bump.
  */
-export const NODEJS_VERSION = "24.3.0";
+export const NODEJS_VERSION = "26.3.0";
 
 /** Node.js NODE_MODULE_VERSION — for native addon ABI compat. */
-export const NODEJS_ABI_VERSION = "137";
+export const NODEJS_ABI_VERSION = "147";
+
+/** V8 version reported by process.versions.v8 — must match the pinned Node.js version's. */
+export const NODEJS_V8_VERSION = "14.6.202.34-node.20";
 
 export const nodejsHeaders: Dependency = {
   name: "nodejs",

scripts/build/flags.ts

@@ -742,14 +742,18 @@ export const defines: Flag[] = [
   },
   {
     // Shell-escaped quotes so clang receives literal quotes in the define
-    // (the preprocessor needs the string to be "24.3.0", not bare 24.3.0).
+    // (the preprocessor needs the string to be "26.3.0", not bare 26.3.0).
     flag: c => `REPORTED_NODEJS_VERSION=\\"${c.nodejsVersion}\\"`,
     desc: "Node.js version string reported by process.version",
   },
   {
     flag: c => `REPORTED_NODEJS_ABI_VERSION=${c.nodejsAbiVersion}`,
     desc: "Node.js ABI version (process.versions.modules)",
   },
+  {
+    flag: c => `REPORTED_NODEJS_V8_VERSION=\\"${c.nodejsV8Version}\\"`,
+    desc: "V8 version string (process.versions.v8)",
+  },
   {
     // Hardcoded ON — experimental flag not exposed in config
     flag: "USE_BUN_MIMALLOC=1",

scripts/packer/windows-x64.pkr.hcl

@@ -14,7 +14,11 @@ source "azure-arm" "windows-x64" {
 
   // Build VM — only used during image creation, not for CI runners.
   // CI runner VM sizes are set in ci.mjs (azureVmSizes).
-  vm_size         = "Standard_D4ds_v6"
+  // D4as_v7 (AMD): D4ds_v6 hit repeated AllocationFailed (no capacity for
+  // that size in the region); Azure's allocation-guidance suggested this
+  // size as an in-region alternative. Build-only VM, so the CPU vendor
+  // doesn't affect the produced image.
+  vm_size         = "Standard_D4as_v7"
 
   // Use existing resource group instead of creating a temp one
   build_resource_group_name = var.resource_group

src/js/builtins/CompressionStream.ts

@@ -1,6 +1,6 @@
 export function initializeCompressionStream(this, format) {
   const zlib = require("node:zlib");
-  const stream = require("node:stream");
+  const { newBufferSourceTransformPairFromDuplex } = require("internal/webstreams_adapters");
 
   const builders = {
     "deflate": zlib.createDeflate,
@@ -13,9 +13,9 @@ export function initializeCompressionStream(this, format) {
   if (!(format in builders))
     throw $ERR_INVALID_ARG_VALUE("format", format, "must be one of: " + Object.keys(builders).join(", "));
 
-  const handle = builders[format]();
-  $putByIdDirectPrivate(this, "readable", stream.Readable.toWeb(handle));
-  $putByIdDirectPrivate(this, "writable", stream.Writable.toWeb(handle));
+  const transform = newBufferSourceTransformPairFromDuplex(builders[format]());
+  $putByIdDirectPrivate(this, "readable", transform.readable);
+  $putByIdDirectPrivate(this, "writable", transform.writable);
 
   return this;
 }

src/js/builtins/DecompressionStream.ts

@@ -1,6 +1,6 @@
 export function initializeDecompressionStream(this, format) {
   const zlib = require("node:zlib");
-  const stream = require("node:stream");
+  const { newBufferSourceTransformPairFromDuplex } = require("internal/webstreams_adapters");
 
   const builders = {
     "deflate": zlib.createInflate,
@@ -13,9 +13,9 @@ export function initializeDecompressionStream(this, format) {
   if (!(format in builders))
     throw $ERR_INVALID_ARG_VALUE("format", format, "must be one of: " + Object.keys(builders).join(", "));
 
-  const handle = builders[format]();
-  $putByIdDirectPrivate(this, "readable", stream.Readable.toWeb(handle));
-  $putByIdDirectPrivate(this, "writable", stream.Writable.toWeb(handle));
+  const transform = newBufferSourceTransformPairFromDuplex(builders[format]());
+  $putByIdDirectPrivate(this, "readable", transform.readable);
+  $putByIdDirectPrivate(this, "writable", transform.writable);
 
   return this;
 }

src/js/builtins/ReadableStreamInternals.ts

@@ -1606,6 +1606,19 @@ export function readableStreamCancel(stream: ReadableStream, reason: any) {
   if (state === $streamErrored) return Promise.$reject($getByIdDirectPrivate(stream, "storedError"));
   $readableStreamClose(stream);
 
+  // https://streams.spec.whatwg.org/#readable-stream-cancel step 5: a BYOB
+  // reader's pending read requests are closed with undefined ($readableStreamClose
+  // only settles default-reader read requests; respond(0) is not coming after cancel).
+  const reader = $getByIdDirectPrivate(stream, "reader");
+  if (reader && $isReadableStreamBYOBReader(reader)) {
+    const requests = $getByIdDirectPrivate(reader, "readIntoRequests");
+    if (requests.isNotEmpty()) {
+      $putByIdDirectPrivate(reader, "readIntoRequests", $createFIFO());
+      for (var request = requests.shift(); request; request = requests.shift())
+        $fulfillPromise(request, { value: undefined, done: true });
+    }
+  }
+
   const controller = $getByIdDirectPrivate(stream, "readableStreamController");
   if (controller === null) return Promise.$resolve();
 

src/js/internal/http.ts

@@ -353,6 +353,8 @@ function emitErrorNt(msg, err, callback) {
 const setMaxHTTPHeaderSize = $newZigFunction("node_http_binding.zig", "setMaxHTTPHeaderSize", 1);
 const getMaxHTTPHeaderSize = $newZigFunction("node_http_binding.zig", "getMaxHTTPHeaderSize", 0);
 const kOutHeaders = Symbol("kOutHeaders");
+const kProxyConfig = Symbol("kProxyConfig");
+const kWaitForProxyTunnel = Symbol("kWaitForProxyTunnel");
 
 function ipToInt(ip) {
   const octets = ip.split(".");
@@ -532,6 +534,7 @@ export {
   kPendingCallbacks,
   kPort,
   kProtocol,
+  kProxyConfig,
   kRealListen,
   kRequest,
   kRes,
@@ -542,6 +545,7 @@ export {
   kTls,
   kUpgradeOrConnect,
   kUseDefaultPort,
+  kWaitForProxyTunnel,
   noBodySymbol,
   optionsSymbol,
   parseProxyConfigFromEnv,

src/js/internal/primordials.js

@@ -96,27 +96,33 @@ const arrayToSafePromiseIterable = (promises, mapFn) =>
 const PromiseAll = Promise.all;
 const PromiseResolve = Promise.$resolve.bind(Promise);
 const SafePromiseAll = (promises, mapFn) => PromiseAll(arrayToSafePromiseIterable(promises, mapFn));
-const SafePromiseAllReturnArrayLike = (promises, mapFn) =>
+// Shared scheduler for SafePromiseAllReturnVoid/ReturnArrayLike: `returnVal`
+// is null for the void variant (no result bookkeeping, resolves with nothing).
+const safePromiseAllCollect = (promises, mapFn, returnVal) =>
   new Promise((resolve, reject) => {
     const { length } = promises;
 
-    const returnVal = Array(length);
-    ObjectSetPrototypeOf(returnVal, null);
-    if (length === 0) resolve(returnVal);
+    if (length === 0) resolve(returnVal ?? undefined);
 
     let pendingPromises = length;
     for (let i = 0; i < length; i++) {
       const promise = mapFn != null ? mapFn(promises[i], i) : promises[i];
       PromisePrototypeThen.$call(
         PromiseResolve(promise),
         result => {
-          returnVal[i] = result;
-          if (--pendingPromises === 0) resolve(returnVal);
+          if (returnVal !== null) returnVal[i] = result;
+          if (--pendingPromises === 0) resolve(returnVal ?? undefined);
         },
         reject,
       );
     }
   });
+const SafePromiseAllReturnVoid = (promises, mapFn) => safePromiseAllCollect(promises, mapFn, null);
+const SafePromiseAllReturnArrayLike = (promises, mapFn) => {
+  const returnVal = Array(promises.length);
+  ObjectSetPrototypeOf(returnVal, null);
+  return safePromiseAllCollect(promises, mapFn, returnVal);
+};
 
 export default {
   Array,
@@ -136,6 +142,7 @@ export default {
   ),
   SafePromiseAll,
   SafePromiseAllReturnArrayLike,
+  SafePromiseAllReturnVoid,
   SafeSet: makeSafe(
     Set,
     class SafeSet extends Set {

src/js/internal/streams/duplex.ts

@@ -140,8 +140,8 @@ Duplex.fromWeb = function (pair, options) {
   return lazyWebStreams().newStreamDuplexFromReadableWritablePair(pair, options);
 };
 
-Duplex.toWeb = function (duplex) {
-  return lazyWebStreams().newReadableWritablePairFromDuplex(duplex);
+Duplex.toWeb = function (duplex, options) {
+  return lazyWebStreams().newReadableWritablePairFromDuplex(duplex, options);
 };
 
 let duplexify;

src/js/internal/streams/duplexify.ts

@@ -312,7 +312,7 @@ function _duplexify(pair) {
     eos(r, err => {
       readable = false;
       if (err) {
-        destroyer(r, err);
+        destroyer(w, err);
       }
       onfinished(err);
     });