Bump minimum supported node version v12.22.9 to v18.3.0.

sbc100 · sbc100 · commit 5728a698c0c3 · 2026-04-06T17:28:11.000-07:00
This change updates the minimum support node version for the generated
code.

v18.3.0 was chosen because that is currently minimum supported version
for running emscripten itself.
diff --git a/.circleci/config.yml b/.circleci/config.yml
@@ -106,11 +106,11 @@ commands:
             cat ~/emsdk/.emscripten
             echo "export PATH=\"$HOME/node-v${version}-linux-x64/bin:\$PATH\"" >> $BASH_ENV
   install-node-oldest:
-    description: "install node 12.22.9 (oldest)"
+    description: "install node 18.3.0 (oldest)"
     steps:
       - install-node-version:
           # Keep this in sync with `OLDEST_SUPPORTED_NODE` in `feature_matrix.py`
-          node_version: "12.22.9"
+          node_version: "18.3.0"
   install-node-lts:
     description: "install node 22.21.0 (current LTS)"
     steps:
@@ -970,8 +970,7 @@ jobs:
       # support in the generated code.
       - install-node-oldest
       - run-tests:
-          title: "node (oldest / 12.22.9)"
-          extra-cflags: "-sMIN_NODE_VERSION=122209"
+          title: "node (oldest / 18.3.0)"
           # We include most but not all of the nodefs and node rawfs tests here.
           # test_fs_nodefs_rw, test_fs_nodefs_statvfs, and test_unistd_io_nodefs_bigint fail.
           test_targets: "
diff --git a/ChangeLog.md b/ChangeLog.md
@@ -32,6 +32,8 @@ See docs/process.md for more on how version tagging works.
 - SDL3 port updated from 3.2.30 to 3.4.2 (#26572)
 - Fixed a race condition in syscall proxying that caused some hangs and ASan
   errors (#26582)
+- The minimum supported version of node for the generated code as bumped from
+  v12.22.0 to v18.3.0. (#26604)
 
 5.0.4 - 03/23/26
 ----------------
diff --git a/site/source/docs/tools_reference/settings_reference.rst b/site/source/docs/tools_reference/settings_reference.rst
@@ -2919,10 +2919,10 @@ MIN_NODE_VERSION
 Specifies minimum node version to target for the generated code.  This is
 distinct from the minimum version required to run the emscripten compiler.
 Version is encoded in MMmmVV, e.g. 181401 denotes Node 18.14.01.
-Minimum supported value is 122209, which was released 2022-01-11 (see
-feature_matrix.py). This version aligns with the Ubuntu TLS 22.04 (Jammy).
+Minimum supported value is 180300, which was released 2022-05-18 (see
+feature_matrix.py).
 
-Default value: 160000
+Default value: 180300
 
 .. _minimal_runtime:
 
diff --git a/src/babel-plugins/strip-node-prefix.mjs b/src/babel-plugins/strip-node-prefix.mjs
diff --git a/src/runtime_common.js b/src/runtime_common.js
@@ -136,18 +136,6 @@ function updateMemoryViews() {
 #endif
 }
 
-#if ENVIRONMENT_MAY_BE_NODE && MIN_NODE_VERSION < 160000
-// The performance global was added to node in v16.0.0:
-// https://nodejs.org/api/globals.html#performance
-if (ENVIRONMENT_IS_NODE) {
-  // This is needed for emscripten_get_now and for pthreads support which
-  // depends on it for accurate timing.
-  // Use `global` rather than `globalThis` here since older versions of node
-  // don't have `globalThis`.
-  global.performance ??= require('perf_hooks').performance;
-}
-#endif
-
 #if IMPORTED_MEMORY
 // In non-standalone/normal mode, we create the memory here.
 #include "runtime_init_memory.js"
diff --git a/src/settings.js b/src/settings.js
@@ -1920,9 +1920,9 @@ var MIN_CHROME_VERSION = 85;
 // Specifies minimum node version to target for the generated code.  This is
 // distinct from the minimum version required to run the emscripten compiler.
 // Version is encoded in MMmmVV, e.g. 181401 denotes Node 18.14.01.
-// Minimum supported value is 122209, which was released 2022-01-11 (see
-// feature_matrix.py). This version aligns with the Ubuntu TLS 22.04 (Jammy).
-var MIN_NODE_VERSION = 160000;
+// Minimum supported value is 180300, which was released 2022-05-18 (see
+// feature_matrix.py).
+var MIN_NODE_VERSION = 180300;
 
 // If true, uses minimal sized runtime without POSIX features, Module,
 // preRun/preInit/etc., Emscripten built-in XHR loading or library_browser.js.
diff --git a/test/codesize/test_codesize_hello_O0.json b/test/codesize/test_codesize_hello_O0.json
@@ -1,10 +1,10 @@
 {
   "a.out.js": 24261,
-  "a.out.js.gz": 8714,
+  "a.out.js.gz": 8720,
   "a.out.nodebug.wasm": 14850,
   "a.out.nodebug.wasm.gz": 7311,
   "total": 39111,
-  "total_gz": 16025,
+  "total_gz": 16031,
   "sent": [
     "fd_write"
   ],
diff --git a/test/codesize/test_codesize_minimal_O0.expected.js b/test/codesize/test_codesize_minimal_O0.expected.js
@@ -19,8 +19,8 @@
   // Note: We use a typeof check here instead of optional chaining using
   // globalThis because older browsers might not have globalThis defined.
   var currentNodeVersion = typeof process !== 'undefined' && process.versions?.node ? humanReadableVersionToPacked(process.versions.node) : TARGET_NOT_SUPPORTED;
-  if (currentNodeVersion < 160000) {
-    throw new Error(`This emscripten-generated code requires node v${ packedVersionToHumanReadable(160000) } (detected v${packedVersionToHumanReadable(currentNodeVersion)})`);
+  if (currentNodeVersion < 180300) {
+    throw new Error(`This emscripten-generated code requires node v${ packedVersionToHumanReadable(180300) } (detected v${packedVersionToHumanReadable(currentNodeVersion)})`);
   }
 
   var userAgent = typeof navigator !== 'undefined' && navigator.userAgent;
diff --git a/test/codesize/test_codesize_minimal_O0.json b/test/codesize/test_codesize_minimal_O0.json
@@ -1,10 +1,10 @@
 {
   "a.out.js": 19452,
-  "a.out.js.gz": 6998,
+  "a.out.js.gz": 7004,
   "a.out.nodebug.wasm": 1015,
   "a.out.nodebug.wasm.gz": 602,
   "total": 20467,
-  "total_gz": 7600,
+  "total_gz": 7606,
   "sent": [],
   "imports": [],
   "exports": [
diff --git a/test/codesize/test_unoptimized_code_size.json b/test/codesize/test_unoptimized_code_size.json
@@ -1,16 +1,16 @@
 {
   "hello_world.js": 57078,
-  "hello_world.js.gz": 17753,
+  "hello_world.js.gz": 17757,
   "hello_world.wasm": 14850,
   "hello_world.wasm.gz": 7311,
   "no_asserts.js": 26654,
   "no_asserts.js.gz": 8901,
   "no_asserts.wasm": 12010,
   "no_asserts.wasm.gz": 5880,
   "strict.js": 54896,
-  "strict.js.gz": 17061,
+  "strict.js.gz": 17065,
   "strict.wasm": 14850,
   "strict.wasm.gz": 7311,
   "total": 180338,
-  "total_gz": 64217
+  "total_gz": 64225
 }
diff --git a/test/common.py b/test/common.py
@@ -28,7 +28,7 @@
 import line_endings
 from retryable_unittest import RetryableTestCase
 
-from tools import building, config, feature_matrix, shared, utils
+from tools import building, config, shared, utils
 from tools.feature_matrix import Feature
 from tools.settings import COMPILE_TIME_SETTINGS
 from tools.shared import DEBUG, EMCC, EMXX, get_canonical_temp_dir
@@ -147,15 +147,6 @@ def record_flaky_test(test_name, attempt_count, max_attempts, exception_msg):
     f.write(f'{test_name}\n')
 
 
-def node_bigint_flags(node_version):
-  # The --experimental-wasm-bigint flag was added in v12, and then removed (enabled by default)
-  # in v16.
-  if node_version and node_version < (16, 0, 0):
-    return ['--experimental-wasm-bigint']
-  else:
-    return []
-
-
 @contextlib.contextmanager
 def env_modify(updates):
   """A context manager that updates os.environ."""
@@ -457,11 +448,7 @@ def require_pthreads(self):
     if self.get_setting('MINIMAL_RUNTIME'):
       self.skipTest('non-browser pthreads not yet supported with MINIMAL_RUNTIME')
     for engine in self.js_engines:
-      if engine_is_node(engine):
-        if not self.try_require_node_version(16, 0, 0):
-          self.fail('node v16 required to run this test')
-        return
-      elif engine_is_bun(engine) or engine_is_deno(engine):
+      if engine_is_node(engine) or engine_is_bun(engine) or engine_is_deno(engine):
         self.require_engine(engine)
         return
     self.fail('no JS engine found capable of running pthreads')
@@ -531,23 +518,6 @@ def try_require_node_version(self, major, minor=0, revision=0):
     self.require_engine(nodejs)
     return True
 
-  def require_simd(self):
-    if 'EMTEST_SKIP_SIMD' in os.environ:
-      self.skipTest('test requires node >= 16 or d8 (and EMTEST_SKIP_SIMD is set)')
-    if self.is_browser_test():
-      return
-
-    if self.try_require_node_version(16):
-      return
-
-    v8 = get_v8()
-    if v8:
-      self.cflags.append('-sENVIRONMENT=shell')
-      self.require_engine(v8)
-      return
-
-    self.fail('either d8 or node >= 16 required to run wasm64 tests.  Use EMTEST_SKIP_SIMD to skip')
-
   def require_wasm_legacy_eh(self):
     if 'EMTEST_SKIP_WASM_LEGACY_EH' in os.environ:
       self.skipTest('test requires node >= 17 or d8 (and EMTEST_SKIP_WASM_LEGACY_EH is set)')
@@ -701,13 +671,6 @@ def setUp(self):
     nodejs = get_nodejs()
     if nodejs:
       node_version = shared.get_node_version(nodejs)
-      if node_version < (13, 0, 0):
-        self.node_args.append('--unhandled-rejections=strict')
-      elif node_version < (15, 0, 0):
-        # Opt in to node v15 default behaviour:
-        # https://nodejs.org/api/cli.html#cli_unhandled_rejections_mode
-        self.node_args.append('--unhandled-rejections=throw')
-      self.node_args += node_bigint_flags(node_version)
 
       # If the version we are running tests in is lower than the version that
       # emcc targets then we need to tell emcc to target that older version.
@@ -719,12 +682,6 @@ def setUp(self):
       )
       if node_version < emcc_min_node_version:
         self.cflags.append('-sMIN_NODE_VERSION=%02d%02d%02d' % node_version)
-        self.cflags.append('-Wno-transpile')
-
-      # This allows much of the test suite to be run on older versions of node that don't
-      # support wasm bigint integration
-      if node_version[0] < feature_matrix.min_browser_versions[feature_matrix.Feature.JS_BIGINT_INTEGRATION]['node'] / 10000:
-        self.cflags.append('-sWASM_BIGINT=0')
 
     self.v8_args = ['--wasm-staging']
     self.env = {}
diff --git a/test/test_core.py b/test/test_core.py
@@ -138,7 +138,6 @@ def wasm_simd(func):
 
   @wraps(func)
   def decorated(self, *args, **kwargs):
-    self.require_simd()
     if self.is_wasm2js():
       self.skipTest('wasm2js only supports MVP for now')
     if '-O3' in self.cflags:
diff --git a/test/test_other.py b/test/test_other.py
@@ -13419,10 +13419,6 @@ def test_node_prefix_transpile(self):
     content = read_file('a.out.js')
     self.assertContained('node:', content)
 
-    self.run_process([EMCC, test_file('hello_world.c'), '-sEXPORT_ES6', '-sMIN_NODE_VERSION=150000', '-Wno-transpile'])
-    content = read_file('a.out.js')
-    self.assertNotContained('node:', content)
-
   def test_gmtime_noleak(self):
     # Confirm that gmtime_r does not leak when called in isolation.
     self.do_other_test('test_gmtime_noleak.c', cflags=['-fsanitize=leak'])
diff --git a/test/test_sanity.py b/test/test_sanity.py
@@ -313,8 +313,8 @@ def test_node(self):
                              ('v4.1.0', False),
                              ('v10.18.0', False),
                              ('v16.20.0', False),
-                             ('v18.3.0', True),
-                             ('v18.3.1-pre', True),
+                             ('v18.19.1', True),
+                             ('v18.19.1-pre', True),
                              ('cheez', False)):
       print(version, succeed)
       delete_file(SANITY_FILE)
diff --git a/tools/building.py b/tools/building.py
@@ -543,13 +543,7 @@ def transpile(filename):
   config = {
     'sourceType': 'script',
     'presets': ['@babel/preset-env'],
-    'plugins': [],
     'targets': {},
-    'parserOpts': {
-      # FIXME: Remove when updating to Babel 8, see:
-      # https://babeljs.io/docs/v8-migration-api#javascript-nodes
-      'createImportExpressions': True,
-    },
   }
   if settings.MIN_CHROME_VERSION != UNSUPPORTED:
     config['targets']['chrome'] = str(settings.MIN_CHROME_VERSION)
@@ -559,7 +553,6 @@ def transpile(filename):
     config['targets']['safari'] = version_split(settings.MIN_SAFARI_VERSION)
   if settings.MIN_NODE_VERSION != UNSUPPORTED:
     config['targets']['node'] = version_split(settings.MIN_NODE_VERSION)
-    config['plugins'] = [path_from_root('src/babel-plugins/strip-node-prefix.mjs')]
   config_json = json.dumps(config, indent=2)
   outfile = shared.get_temp_files().get('babel.js').name
   config_file = shared.get_temp_files().get('babel_config.json').name
diff --git a/tools/feature_matrix.py b/tools/feature_matrix.py
@@ -25,9 +25,9 @@
 OLDEST_SUPPORTED_CHROME = 74  # Released on 2019-04-23
 OLDEST_SUPPORTED_FIREFOX = 68  # Released on 2019-07-09
 OLDEST_SUPPORTED_SAFARI = 120200  # Released on 2019-03-25
-# 12.22.09 is the oldest version of node that we do any testing with.
+# This is the oldest version of node that we do any testing with.
 # Keep this in sync with the test-node-compat in .circleci/config.yml.
-OLDEST_SUPPORTED_NODE = 122209
+OLDEST_SUPPORTED_NODE = 180300
 
 
 class Feature(IntEnum):
diff --git a/tools/link.py b/tools/link.py
@@ -1380,8 +1380,7 @@ def limit_incoming_module_api():
     # TODO: replace this with feature matrix in the future.
     settings.TRANSPILE = (settings.MIN_FIREFOX_VERSION < 79 or
                           settings.MIN_CHROME_VERSION < 85 or
-                          settings.MIN_SAFARI_VERSION < 140000 or
-                          settings.MIN_NODE_VERSION < 160000)
+                          settings.MIN_SAFARI_VERSION < 140000)
 
   if settings.STB_IMAGE:
     settings.EXPORTED_FUNCTIONS += ['_stbi_load', '_stbi_load_from_memory', '_stbi_image_free']
