From 52ba7ce674f8bb45510927cf2e188346f75fa7d0 Mon Sep 17 00:00:00 2001
From: Yagiz Nizipli <yagiz@nizipli.com>
Date: Sat, 29 Aug 2026 20:57:18 +0000
Subject: [PATCH] src: remove experimental ShadowRealm support

The TC39 ShadowRealm proposal remains unimplemented by browsers,
and WPT removed ShadowRealm test coverage. Remove the Node.js
host integration, the --experimental-shadow-realm CLI flag, and
related tests.

Refs: https://github.com/web-platform-tests/wpt/pull/59794
Refs: https://github.com/nodejs/node/issues/42528
Signed-off-by: Yagiz Nizipli <yagiz@nizipli.com>
Co-authored-by: Yagiz Nizipli <anonrig@users.noreply.github.com>
---
 doc/api/cli.md                                |  14 --
 doc/node-config-schema.json                   |   4 -
 doc/node.1                                    |   5 -
 eslint.config.mjs                             |   1 -
 lib/eslint.config_partial.mjs                 |   6 -
 lib/internal/bootstrap/realm.js               |  13 +-
 lib/internal/bootstrap/shadow_realm.js        |  21 ---
 lib/internal/errors.js                        |   8 +-
 lib/internal/process/pre_execution.js         |  30 ---
 node.gyp                                      |   2 -
 src/README.md                                 |  21 +--
 src/api/environment.cc                        |   8 -
 src/async_wrap.cc                             |   2 -
 src/env.cc                                    |  12 --
 src/env.h                                     |   9 +-
 src/node_context_data.h                       |  20 +-
 src/node_options.cc                           |   8 -
 src/node_options.h                            |   1 -
 src/node_realm.h                              |  10 +-
 src/node_shadow_realm.cc                      | 178 ------------------
 src/node_shadow_realm.h                       |  46 -----
 test/common/globals.js                        |   1 -
 .../es-module-shadow-realm/custom-loaders.js  |  15 --
 .../es-module-shadow-realm/preload-main.js    |   9 -
 .../es-module-shadow-realm/preload.js         |   1 -
 .../re-export-state-counter.mjs               |   3 -
 .../es-module-shadow-realm/state-counter.mjs  |   4 -
 .../console-log-shadowrealm-manual.html       |  10 -
 .../console/idlharness-shadowrealm.window.js  |   5 -
 .../wpt/dom/abort/timeout-shadowrealm.any.js  |   5 -
 .../encoding/idlharness-shadowrealm.window.js |   2 -
 .../hr-time/idlharness-shadowrealm.window.js  |   2 -
 .../idlharness-shadowrealm.window.js          |   2 -
 .../idlharness-shadowrealm.window.js          |   2 -
 ...st-shadow-realm-allowed-builtin-modules.js |  21 ---
 .../test-shadow-realm-custom-loaders.js       |  26 ---
 test/parallel/test-shadow-realm-gc-module.js  |  18 --
 test/parallel/test-shadow-realm-gc.js         |  24 ---
 test/parallel/test-shadow-realm-globals.js    |  27 ---
 .../test-shadow-realm-import-value-resolve.js |  31 ---
 test/parallel/test-shadow-realm-module.js     |  29 ---
 .../test-shadow-realm-preload-module.js       |  20 --
 .../test-shadow-realm-prepare-stack-trace.js  |  53 ------
 test/parallel/test-shadow-realm.js            |  12 --
 test/pummel/test-heapdump-shadow-realm.js     |  39 ----
 test/wpt/status/compression.json              |   3 -
 test/wpt/status/console.json                  |   3 -
 test/wpt/status/dom/abort.json                |   6 +-
 test/wpt/status/encoding.json                 |   3 -
 test/wpt/status/hr-time.cjs                   |   4 -
 test/wpt/status/performance-timeline.json     |   3 -
 test/wpt/status/streams.json                  |   3 -
 test/wpt/status/user-timing.json              |   3 -
 53 files changed, 25 insertions(+), 783 deletions(-)
 delete mode 100644 lib/internal/bootstrap/shadow_realm.js
 delete mode 100644 src/node_shadow_realm.cc
 delete mode 100644 src/node_shadow_realm.h
 delete mode 100644 test/fixtures/es-module-shadow-realm/custom-loaders.js
 delete mode 100644 test/fixtures/es-module-shadow-realm/preload-main.js
 delete mode 100644 test/fixtures/es-module-shadow-realm/preload.js
 delete mode 100644 test/fixtures/es-module-shadow-realm/re-export-state-counter.mjs
 delete mode 100644 test/fixtures/es-module-shadow-realm/state-counter.mjs
 delete mode 100644 test/fixtures/wpt/console/console-log-shadowrealm-manual.html
 delete mode 100644 test/fixtures/wpt/console/idlharness-shadowrealm.window.js
 delete mode 100644 test/fixtures/wpt/dom/abort/timeout-shadowrealm.any.js
 delete mode 100644 test/fixtures/wpt/encoding/idlharness-shadowrealm.window.js
 delete mode 100644 test/fixtures/wpt/hr-time/idlharness-shadowrealm.window.js
 delete mode 100644 test/fixtures/wpt/performance-timeline/idlharness-shadowrealm.window.js
 delete mode 100644 test/fixtures/wpt/user-timing/idlharness-shadowrealm.window.js
 delete mode 100644 test/parallel/test-shadow-realm-allowed-builtin-modules.js
 delete mode 100644 test/parallel/test-shadow-realm-custom-loaders.js
 delete mode 100644 test/parallel/test-shadow-realm-gc-module.js
 delete mode 100644 test/parallel/test-shadow-realm-gc.js
 delete mode 100644 test/parallel/test-shadow-realm-globals.js
 delete mode 100644 test/parallel/test-shadow-realm-import-value-resolve.js
 delete mode 100644 test/parallel/test-shadow-realm-module.js
 delete mode 100644 test/parallel/test-shadow-realm-preload-module.js
 delete mode 100644 test/parallel/test-shadow-realm-prepare-stack-trace.js
 delete mode 100644 test/parallel/test-shadow-realm.js
 delete mode 100644 test/pummel/test-heapdump-shadow-realm.js

diff --git a/doc/api/cli.md b/doc/api/cli.md
index 09c9b5309ffa..e9b0ec6fa86e 100644
--- a/doc/api/cli.md
+++ b/doc/api/cli.md
@@ -1419,16 +1419,6 @@ Use this flag to generate a blob that can be injected into the Node.js
 binary to produce a [single executable application][]. See the documentation
 about [this configuration][`--experimental-sea-config`] for details.
 
-### `--experimental-shadow-realm`
-
-<!-- YAML
-added:
-  - v19.0.0
-  - v18.13.0
--->
-
-Use this flag to enable [ShadowRealm][] support.
-
 ### `--experimental-storage-inspection`
 
 <!-- YAML
@@ -3914,7 +3904,6 @@ one is included in the list below.
 * `--experimental-quic`
 * `--experimental-repl-await`
 * `--experimental-require-module`
-* `--experimental-shadow-realm`
 * `--experimental-specifier-resolution`
 * `--experimental-stream-iter`
 * `--experimental-test-isolation`
@@ -4419,8 +4408,6 @@ documented here:
 
 ### `--expose-gc`
 
-### `--harmony-shadow-realm`
-
 ### `--heap-snapshot-on-oom`
 
 ### `--interpreted-frames-native-stack`
@@ -4526,7 +4513,6 @@ node --stack-trace-limit=12 -p -e "Error.stackTraceLimit" # prints 12
 [Permission Model]: permissions.md#permission-model
 [REPL]: repl.md
 [ScriptCoverage]: https://chromedevtools.github.io/devtools-protocol/tot/Profiler#type-ScriptCoverage
-[ShadowRealm]: https://github.com/tc39/proposal-shadowrealm
 [Source Map]: https://tc39.es/ecma426/
 [Test tags]: test.md#test-tags
 [TypeScript type-stripping]: typescript.md#type-stripping
diff --git a/doc/node-config-schema.json b/doc/node-config-schema.json
index 4618a5f17df1..24cf615cbd96 100644
--- a/doc/node-config-schema.json
+++ b/doc/node-config-schema.json
@@ -252,10 +252,6 @@
               "type": "boolean",
               "description": "Legacy alias for --require-module"
             },
-            "experimental-shadow-realm": {
-              "type": "boolean",
-              "description": ""
-            },
             "experimental-sqlite": {
               "type": "boolean",
               "description": "experimental node:sqlite module"
diff --git a/doc/node.1 b/doc/node.1
index 72680aa892ab..bade9d789f22 100644
--- a/doc/node.1
+++ b/doc/node.1
@@ -791,9 +791,6 @@ Use this flag to generate a blob that can be injected into the Node.js
 binary to produce a single executable application. See the documentation
 about this configuration for details.
 .
-.It Fl -experimental-shadow-realm
-Use this flag to enable ShadowRealm support.
-.
 .It Fl -experimental-storage-inspection
 Enable experimental support for storage inspection
 .
@@ -2016,8 +2013,6 @@ one is included in the list below.
 .It
 \fB--experimental-require-module\fR
 .It
-\fB--experimental-shadow-realm\fR
-.It
 \fB--experimental-specifier-resolution\fR
 .It
 \fB--experimental-stream-iter\fR
diff --git a/eslint.config.mjs b/eslint.config.mjs
index c19e8f3cf46e..5c6cbef50757 100644
--- a/eslint.config.mjs
+++ b/eslint.config.mjs
@@ -143,7 +143,6 @@ export default [
         ReadableStreamDefaultReader: 'readonly',
         Response: 'readonly',
         sessionStorage: 'readonly',
-        ShadowRealm: 'readonly',
         Storage: 'readonly',
         SubtleCrypto: 'readonly',
         TextDecoderStream: 'readonly',
diff --git a/lib/eslint.config_partial.mjs b/lib/eslint.config_partial.mjs
index 638e60c923b7..4471d97ca8a5 100644
--- a/lib/eslint.config_partial.mjs
+++ b/lib/eslint.config_partial.mjs
@@ -240,12 +240,6 @@ export default [
           name: 'Response',
           message: "Use `const { Response } = require('internal/deps/undici/undici');` instead of the global.",
         },
-        // ShadowRealm is not available in primordials because it can be
-        // disabled with --no-harmony-shadow-realm CLI flag.
-        {
-          name: 'ShadowRealm',
-          message: 'Use `const { ShadowRealm } = globalThis;` instead of the global.',
-        },
         // SharedArrayBuffer is not available in primordials because it can be
         // disabled with --enable-sharedarraybuffer-per-context CLI flag.
         {
diff --git a/lib/internal/bootstrap/realm.js b/lib/internal/bootstrap/realm.js
index 4dfb39ae9568..6a4736b35b5e 100644
--- a/lib/internal/bootstrap/realm.js
+++ b/lib/internal/bootstrap/realm.js
@@ -1,5 +1,5 @@
 // This file is executed in every realm that is created by Node.js, including
-// the context of main thread, worker threads, and ShadowRealms.
+// the context of the main thread and worker threads.
 // Only per-realm internal states and bindings should be bootstrapped in this
 // file and no globals should be exposed to the user code.
 //
@@ -226,8 +226,8 @@ const internalBuiltinIds = builtinIds
   .filter((id) => StringPrototypeStartsWith(id, 'internal/') && id !== selfId);
 
 // When --expose-internals is on we'll add the internal builtin ids to these.
-let canBeRequiredByUsersList = new SafeSet(publicBuiltinIds);
-let canBeRequiredByUsersWithoutSchemeList =
+const canBeRequiredByUsersList = new SafeSet(publicBuiltinIds);
+const canBeRequiredByUsersWithoutSchemeList =
   new SafeSet(publicBuiltinIds.filter((id) => !schemelessBlockList.has(id)));
 
 /**
@@ -280,13 +280,6 @@ class BuiltinModule {
     }
   }
 
-  static setRealmAllowRequireByUsers(ids) {
-    canBeRequiredByUsersList =
-      new SafeSet(ArrayPrototypeFilter(ids, (id) => ArrayPrototypeIncludes(publicBuiltinIds, id)));
-    canBeRequiredByUsersWithoutSchemeList =
-      new SafeSet(ArrayPrototypeFilter(ids, (id) => !schemelessBlockList.has(id)));
-  }
-
   // To be called during pre-execution when --expose-internals is on.
   // Enables the user-land module loader to access internal modules.
   static exposeInternals() {
diff --git a/lib/internal/bootstrap/shadow_realm.js b/lib/internal/bootstrap/shadow_realm.js
deleted file mode 100644
index b99502355d98..000000000000
--- a/lib/internal/bootstrap/shadow_realm.js
+++ /dev/null
@@ -1,21 +0,0 @@
-'use strict';
-
-// This script sets up the context for shadow realms.
-
-const {
-  prepareShadowRealmExecution,
-} = require('internal/process/pre_execution');
-const {
-  BuiltinModule,
-} = require('internal/bootstrap/realm');
-
-BuiltinModule.setRealmAllowRequireByUsers([
-  /**
-   * The built-in modules exposed in the ShadowRealm must each be providing
-   * platform capabilities with no authority to cause side effects such as
-   * I/O or mutation of values that are shared across different realms within
-   * the same Node.js environment.
-   */
-]);
-
-prepareShadowRealmExecution();
diff --git a/lib/internal/errors.js b/lib/internal/errors.js
index 221a40ecdf86..69aa67efd294 100644
--- a/lib/internal/errors.js
+++ b/lib/internal/errors.js
@@ -121,11 +121,9 @@ function isPermissionModelError(err) {
 
 /**
  * Every realm has its own prepareStackTraceCallback. When `error.stack` is
- * accessed, if the error is created in a shadow realm, the shadow realm's
- * prepareStackTraceCallback is invoked. Otherwise, the principal realm's
- * prepareStackTraceCallback is invoked. Note that accessing `error.stack`
- * of error objects created in a VM Context will always invoke the
- * prepareStackTraceCallback of the principal realm.
+ * accessed, the principal realm's prepareStackTraceCallback is invoked.
+ * Note that accessing `error.stack` of error objects created in a VM Context
+ * will always invoke the prepareStackTraceCallback of the principal realm.
  * @param {object} globalThis The global object of the realm that the error was
  *   created in. When the error object is created in a VM Context, this is the
  *   global object of that VM Context.
diff --git a/lib/internal/process/pre_execution.js b/lib/internal/process/pre_execution.js
index 56544e7fef62..1b1cb47f65b8 100644
--- a/lib/internal/process/pre_execution.js
+++ b/lib/internal/process/pre_execution.js
@@ -74,34 +74,6 @@ function prepareWorkerThreadExecution() {
   });
 }
 
-function prepareShadowRealmExecution() {
-  // Patch the process object with legacy properties and normalizations.
-  // Do not expand argv1 as it is not available in ShadowRealm.
-  patchProcessObject(false);
-  setupDebugEnv();
-
-  // Disable custom loaders in ShadowRealm.
-  initializeModuleLoaders({ shouldSpawnLoaderHookWorker: false, shouldPreloadModules: false });
-  const {
-    privateSymbols: {
-      host_defined_option_symbol,
-    },
-  } = internalBinding('util');
-  const {
-    vm_dynamic_import_default_internal,
-  } = internalBinding('symbols');
-
-  // For ShadowRealm.prototype.importValue(), the referrer name is
-  // always null, so the native ImportModuleDynamically() callback would
-  // always fallback to look up the host-defined option from the
-  // global object using host_defined_option_symbol. Using
-  // vm_dynamic_import_default_internal as the host-defined option
-  // instructs the JS-land importModuleDynamicallyCallback() to
-  // proxy the request to defaultImportModuleDynamically().
-  globalThis[host_defined_option_symbol] =
-    vm_dynamic_import_default_internal;
-}
-
 function prepareExecution(options) {
   const { expandArgv1, initializeModules, isMainThread, shouldSpawnLoaderHookWorker, shouldPreloadModules } = options;
 
@@ -247,7 +219,6 @@ function initializeModuleLoaders(options) {
   }
   // Do not enable preload modules if custom loaders are disabled.
   // For example, loader workers are responsible for doing this themselves.
-  // And preload modules are not supported in ShadowRealm as well.
   if (shouldPreloadModules) {
     loadPreloadModules();
   }
@@ -830,7 +801,6 @@ module.exports = {
   initializeModuleLoaders,
   prepareMainThreadExecution,
   prepareWorkerThreadExecution,
-  prepareShadowRealmExecution,
   prepareTestRunnerMainExecution,
   markBootstrapComplete,
   loadPreloadModules,
diff --git a/node.gyp b/node.gyp
index 8cf405215249..babd21b8e980 100644
--- a/node.gyp
+++ b/node.gyp
@@ -159,7 +159,6 @@
       'src/node_sea.cc',
       'src/node_sea_bin.cc',
       'src/node_serdes.cc',
-      'src/node_shadow_realm.cc',
       'src/node_snapshotable.cc',
       'src/node_sockaddr.cc',
       'src/node_stat_watcher.cc',
@@ -289,7 +288,6 @@
       'src/node_revert.h',
       'src/node_root_certs.h',
       'src/node_sea.h',
-      'src/node_shadow_realm.h',
       'src/node_snapshotable.h',
       'src/node_snapshot_builder.h',
       'src/node_sockaddr.h',
diff --git a/src/README.md b/src/README.md
index 7cdf099ff819..112c7470fa2c 100644
--- a/src/README.md
+++ b/src/README.md
@@ -286,8 +286,7 @@ V8 refers to each of these global objects and their associated builtins as a
 
 Currently, in Node.js there is one main `Context` associated with the
 principal [`Realm`][] of an [`Environment`][] instance, and a number of
-subsidiary `Context`s that are created with `vm.Context` or associated with
-[`ShadowRealm`][].
+subsidiary `Context`s that are created with `vm.Context`.
 
 Most Node.js features will only work inside a context associated with a
 `Realm`. The only exception at the time of writing are [`MessagePort`][]
@@ -358,14 +357,11 @@ Each ECMAScript realm comes with a global object and a set of intrinsic
 objects. An ECMAScript realm has a `[[HostDefined]]` field, which represents
 the Node.js [`Realm`][] object.
 
-Every `Realm` instance is created for a particular [`Context`][]. A `Realm`
-can be a principal realm or a synthetic realm. A principal realm is created
-for each `Environment`'s main [`Context`][]. A synthetic realm is created
-for the [`Context`][] of each [`ShadowRealm`][] constructed from the JS API. No
-`Realm` is created for the [`Context`][] of a `vm.Context`.
+Every `Realm` instance is created for a particular [`Context`][]. A principal
+realm is created for each `Environment`'s main [`Context`][]. No `Realm` is
+created for the [`Context`][] of a `vm.Context`.
 
-Native bindings and built-in modules can be evaluated in either a principal
-realm or a synthetic realm.
+Native bindings and built-in modules are evaluated in the principal realm.
 
 The `Realm` class contains a large number of different fields for
 different built-in modules, for example the memory for a `Uint32Array` that
@@ -861,10 +857,8 @@ and requests are cancelled if possible.
 
 #### Cleanup realms and BaseObjects
 
-Realm cleanup depends on the realm types. All realms are destroyed when the
-[`Environment`][] is destroyed with the cleanup hook. A [`ShadowRealm`][] can
-also be destroyed by the garbage collection when there is no strong reference
-to it.
+All realms are destroyed when the [`Environment`][] is destroyed with the
+cleanup hook.
 
 Every [`BaseObject`][] is tracked with its creation realm and will be destroyed
 when the realm is tearing down.
@@ -1493,7 +1487,6 @@ static void GetUserInfo(const FunctionCallbackInfo<Value>& args) {
 [`MessagePort`]: https://nodejs.org/api/worker_threads.html#worker_threads_class_messageport
 [`Realm`]: #realm
 [`ReqWrap`]: #reqwrap
-[`ShadowRealm`]: https://github.com/tc39/proposal-shadowrealm
 [`async_hooks` module]: https://nodejs.org/api/async_hooks.html
 [`async_wrap.h`]: async_wrap.h
 [`base_object.h`]: base_object.h
diff --git a/src/api/environment.cc b/src/api/environment.cc
index 3b94d860de1e..109499553d5d 100644
--- a/src/api/environment.cc
+++ b/src/api/environment.cc
@@ -14,7 +14,6 @@
 #include "node_options-inl.h"
 #include "node_platform.h"
 #include "node_realm-inl.h"
-#include "node_shadow_realm.h"
 #include "node_snapshot_builder.h"
 #include "node_v8_platform-inl.h"
 #include "node_wasm_web_api.h"
@@ -270,13 +269,6 @@ void SetIsolateMiscHandlers(v8::Isolate* isolate, const IsolateSettings& s) {
 
   isolate->SetWasmStreamingCallback(wasm_web_api::StartStreamingCompilation);
 
-  Mutex::ScopedLock lock(node::per_process::cli_options_mutex);
-  if (per_process::cli_options->get_per_isolate_options()
-          ->experimental_shadow_realm) {
-    isolate->SetHostCreateShadowRealmContextCallback(
-        shadow_realm::HostCreateShadowRealmContextCallback);
-  }
-
   if ((s.flags & SHOULD_NOT_SET_PROMISE_REJECTION_CALLBACK) == 0) {
     auto* promise_reject_cb = s.promise_reject_callback ?
       s.promise_reject_callback : PromiseRejectCallback;
diff --git a/src/async_wrap.cc b/src/async_wrap.cc
index 7b7930187bd5..1ed3600f6507 100644
--- a/src/async_wrap.cc
+++ b/src/async_wrap.cc
@@ -484,8 +484,6 @@ void AsyncWrap::CreatePerContextProperties(Local<Object> target,
 #undef FORCE_SET_TARGET_FIELD
 
   // TODO(legendecas): async hook functions are not realm-aware yet.
-  // This simply avoid overriding principal realm's functions when a
-  // ShadowRealm initializes the binding.
   realm->set_async_hooks_init_function(Local<Function>());
   realm->set_async_hooks_before_function(Local<Function>());
   realm->set_async_hooks_after_function(Local<Function>());
diff --git a/src/env.cc b/src/env.cc
index 7ec8c50b1aba..39afb6ae5938 100644
--- a/src/env.cc
+++ b/src/env.cc
@@ -12,7 +12,6 @@
 #include "node_internals.h"
 #include "node_options-inl.h"
 #include "node_process-inl.h"
-#include "node_shadow_realm.h"
 #include "node_snapshotable.h"
 #include "node_v8_platform-inl.h"
 #include "node_worker.h"
@@ -264,14 +263,6 @@ void Environment::UntrackContext(Local<Context> context) {
   }
 }
 
-void Environment::TrackShadowRealm(shadow_realm::ShadowRealm* realm) {
-  shadow_realms_.insert(realm);
-}
-
-void Environment::UntrackShadowRealm(shadow_realm::ShadowRealm* realm) {
-  shadow_realms_.erase(realm);
-}
-
 AsyncHooks::DefaultTriggerAsyncIdScope::DefaultTriggerAsyncIdScope(
     Environment* env, double default_trigger_async_id)
     : async_hooks_(env->async_hooks()) {
@@ -1122,8 +1113,6 @@ Environment::~Environment() {
   inspector_agent_.reset();
 #endif
 
-  // Sub-realms should have been cleared with Environment's cleanup.
-  DCHECK_EQ(shadow_realms_.size(), 0);
   principal_realm_.reset();
 
   if (trace_state_observer_) {
@@ -2337,7 +2326,6 @@ void Environment::MemoryInfo(MemoryTracker* tracker) const {
   tracker->TrackField("timeout_info", timeout_info_);
   tracker->TrackField("tick_info", tick_info_);
   tracker->TrackField("principal_realm", principal_realm_);
-  tracker->TrackField("shadow_realms", shadow_realms_);
 
   // FIXME(joyeecheung): track other fields in Environment.
   // Currently MemoryTracker is unable to track these
diff --git a/src/env.h b/src/env.h
index 826ed33f697e..caa01e11aa3c 100644
--- a/src/env.h
+++ b/src/env.h
@@ -76,9 +76,6 @@ class MacCache;
 
 namespace node {
 
-namespace shadow_realm {
-class ShadowRealm;
-}
 namespace contextify {
 class ContextifyScript;
 class CompiledFnEntry;
@@ -620,8 +617,7 @@ class Cleanable {
 
 /**
  * Environment is a per-isolate data structure that represents an execution
- * environment. Each environment has a principal realm. An environment can
- * create multiple subsidiary synthetic realms.
+ * environment. Each environment has a principal realm.
  */
 class Environment final : public MemoryRetainer {
  public:
@@ -707,8 +703,6 @@ class Environment final : public MemoryRetainer {
                        Realm* realm,
                        const ContextInfo& info);
   void UnassignFromContext(v8::Local<v8::Context> context);
-  void TrackShadowRealm(shadow_realm::ShadowRealm* realm);
-  void UntrackShadowRealm(shadow_realm::ShadowRealm* realm);
 
   void StartProfilerIdleNotifier();
 
@@ -1148,7 +1142,6 @@ class Environment final : public MemoryRetainer {
 
   size_t async_callback_scope_depth_ = 0;
   std::vector<double> destroy_async_id_list_;
-  std::unordered_set<shadow_realm::ShadowRealm*> shadow_realms_;
 
 #if HAVE_INSPECTOR
   std::unique_ptr<profiler::V8CoverageConnection> coverage_connection_;
diff --git a/src/node_context_data.h b/src/node_context_data.h
index 02eae73cb2ca..37e8211c912b 100644
--- a/src/node_context_data.h
+++ b/src/node_context_data.h
@@ -53,7 +53,7 @@ namespace node {
  * via v8::Context::SetAlignedPointerInEmbedderData() (for pointers) and
  * v8::Context::SetEmbedderData() (for v8::Values).
  *
- * There are five types of contexts in Node.js:
+ * There are four types of contexts in Node.js:
  * 1. Default V8 context, with nothing Node.js-specific. This is normally only
  *    created by the embedders that uses v8::Context APIs directly and is not
  *    available through the Node.js JS APIs. Its context snapshot in the
@@ -81,16 +81,10 @@ namespace node {
  *    the initialization code is in node::ContextifyContext::New().
  *    Its context snapshot in the built-in V8 startup snapshot is stored at
  *    node::SnapshotData::kNodeVMContextIndex.
- * 5. ShadowRealm context: When a JS ShadowRealm is created via new ShadowRealm,
- *    it gets its own v8::Context. It also shares the thread, the v8::Isolate
- *    and the node::Environment with the context where the ShadowRealm
- *    constructor is called.  The corresponding data structure is
- *    node::ShadowRealm and the initialization code is in
- *    node::ShadowRealm::New().
  */
 enum ContextEmbedderIndex {
   // Pointer to the node::Environment associated with the context. Only set for
-  // context type 2-5. Used by Environment::GetCurrent(context) to retrieve
+  // context type 2-4. Used by Environment::GetCurrent(context) to retrieve
   // the node::Environment associated with any Node.js context in the
   // V8 callbacks.
   kEnvironment = NODE_CONTEXT_EMBEDDER_DATA_INDEX,
@@ -100,13 +94,13 @@ enum ContextEmbedderIndex {
   kSandboxObject = NODE_CONTEXT_SANDBOX_OBJECT_INDEX,
   // A v8::Value indicating whether the context allows WebAssembly code
   // generation.
-  // Only set for context type 2-5, and for them the default is v8::True.
+  // Only set for context type 2-4, and for them the default is v8::True.
   // For context type 4 it's configurable via options.codeGeneration.wasm in the
   // vm APIs. Used in the default v8::AllowWasmCodeGenerationCallback.
   kAllowWasmCodeGeneration = NODE_CONTEXT_ALLOW_WASM_CODE_GENERATION_INDEX,
   // A v8::Value indicating whether the context allows code generation via
   // eval() or new Function().
-  // Only set for context type 2-5, and for them the default is v8::True.
+  // Only set for context type 2-4, and for them the default is v8::True.
   // For context type 4 it's configurable via options.codeGeneration.strings in
   // the
   // vm APIs. Used in the default v8::AllowCodeGenerationFromStringsCallback.
@@ -117,14 +111,14 @@ enum ContextEmbedderIndex {
   // to the ContextifyContext from the property interceptors.
   kContextifyContext = NODE_CONTEXT_CONTEXTIFY_CONTEXT_INDEX,
   // Pointer to the node::Realm associated with the context.
-  // Only set for context type 2-3 and 5. For context type 2-3, it points to a
-  // node::PrincipalRealm. For context type 5 it points to a node::ShadowRealm.
+  // Only set for context type 2-3. For those types it points to a
+  // node::PrincipalRealm.
   // Used by Realm::GetCurrent(context) to retrieve the associated node::Realm
   // with any Node.js context in the V8 callbacks.
   kRealm = NODE_CONTEXT_REALM_INDEX,
   // Pointer to a constant address which is
   // node::ContextEmbedderTag::kNodeContextTagPtr.
-  // Only set for context type 2-5. Used by ContextEmbedderTag::IsNodeContext()
+  // Only set for context type 2-4. Used by ContextEmbedderTag::IsNodeContext()
   // to check whether a context is a Node.js context.
   kContextTag = NODE_CONTEXT_TAG,
 };
diff --git a/src/node_options.cc b/src/node_options.cc
index 78309d1ae5cd..4b6f9bffb1fd 100644
--- a/src/node_options.cc
+++ b/src/node_options.cc
@@ -1333,14 +1333,6 @@ PerIsolateOptionsParser::PerIsolateOptionsParser(
 
   AddOption("--experimental-top-level-await", "", NoOp{}, kAllowedInEnvvar);
 
-  AddOption("--experimental-shadow-realm",
-            "",
-            BOOL_FIELD(experimental_shadow_realm),
-            kAllowedInEnvvar);
-  AddOption("--harmony-shadow-realm", "", V8Option{});
-  Implies("--experimental-shadow-realm", "--harmony-shadow-realm");
-  Implies("--harmony-shadow-realm", "--experimental-shadow-realm");
-  ImpliesNot("--no-harmony-shadow-realm", "--experimental-shadow-realm");
   AddOption("--build-snapshot",
             "Generate a snapshot blob when the process exits.",
             BOOL_FIELD(build_snapshot),
diff --git a/src/node_options.h b/src/node_options.h
index 907174fe6c57..0fe94821e7d5 100644
--- a/src/node_options.h
+++ b/src/node_options.h
@@ -325,7 +325,6 @@ class PerIsolateOptions : public Options {
   DEFINE_BOOL_FIELD(track_heap_objects) = false;
   DEFINE_BOOL_FIELD(report_uncaught_exception) = false;
   DEFINE_BOOL_FIELD(report_on_signal) = false;
-  DEFINE_BOOL_FIELD(experimental_shadow_realm) = false;
   DEFINE_BOOL_FIELD(build_snapshot) = false;
 
   inline EnvironmentOptions* get_per_env_options();
diff --git a/src/node_realm.h b/src/node_realm.h
index 690beaf1a1aa..30d5931e1cf1 100644
--- a/src/node_realm.h
+++ b/src/node_realm.h
@@ -69,18 +69,14 @@ class CppgcWrapperList
  * with a global object and a set of intrinsic objects. An ECMAScript realm has
  * a [[HostDefined]] field, which contains the node::Realm object.
  *
- * Realm can be a principal realm or a synthetic realm. A principal realm is
- * created with an Environment as its principal global environment to evaluate
- * scripts. A synthetic realm is created with JS APIs like ShadowRealm.
- *
- * Native bindings and builtin modules can be evaluated in either a principal
- * realm or a synthetic realm.
+ * Each Environment has a principal realm used to evaluate scripts. Native
+ * bindings and builtin modules are evaluated in that realm. No Realm is
+ * created for the Context of a vm.Context.
  */
 class Realm : public MemoryRetainer {
  public:
   enum Kind {
     kPrincipal,
-    kShadowRealm,
   };
 
   static inline Realm* GetCurrent(v8::Isolate* isolate);
diff --git a/src/node_shadow_realm.cc b/src/node_shadow_realm.cc
deleted file mode 100644
index 1273555b50c8..000000000000
--- a/src/node_shadow_realm.cc
+++ /dev/null
@@ -1,178 +0,0 @@
-#include "node_shadow_realm.h"
-#include "env-inl.h"
-#include "node_errors.h"
-#include "node_process.h"
-
-namespace node {
-namespace shadow_realm {
-using v8::Context;
-using v8::EscapableHandleScope;
-using v8::HandleScope;
-using v8::Local;
-using v8::MaybeLocal;
-using v8::Object;
-using v8::String;
-using v8::Value;
-
-using TryCatchScope = node::errors::TryCatchScope;
-
-// static
-ShadowRealm* ShadowRealm::New(Environment* env) {
-  ShadowRealm* realm = new ShadowRealm(env);
-  // TODO(legendecas): required by node::PromiseRejectCallback.
-  // Remove this once promise rejection doesn't need to be handled across
-  // realms.
-  realm->context()->SetSecurityToken(
-      env->principal_realm()->context()->GetSecurityToken());
-
-  // We do not expect the realm bootstrapping to throw any
-  // exceptions. If it does, exit the current Node.js instance.
-  TryCatchScope try_catch(env, TryCatchScope::CatchMode::kFatal);
-  if (realm->RunBootstrapping().IsEmpty()) {
-    delete realm;
-    return nullptr;
-  }
-  return realm;
-}
-
-// static
-MaybeLocal<Context> HostCreateShadowRealmContextCallback(
-    Local<Context> initiator_context) {
-  Environment* env = Environment::GetCurrent(initiator_context);
-  EscapableHandleScope scope(env->isolate());
-
-  // We do not expect the realm bootstrapping to throw any
-  // exceptions. If it does, exit the current Node.js instance.
-  TryCatchScope try_catch(env, TryCatchScope::CatchMode::kFatal);
-  ShadowRealm* realm = ShadowRealm::New(env);
-  if (realm != nullptr) {
-    return scope.Escape(realm->context());
-  }
-  return MaybeLocal<Context>();
-}
-
-// static
-void ShadowRealm::WeakCallback(const v8::WeakCallbackInfo<ShadowRealm>& data) {
-  ShadowRealm* realm = data.GetParameter();
-  realm->context_.Reset();
-
-  // Yield to pending weak callbacks before deleting the realm.
-  // This is necessary to avoid cleaning up base objects before their scheduled
-  // weak callbacks are invoked, which can lead to accessing to v8 apis during
-  // the first pass of the weak callback.
-  realm->env()->SetImmediate([realm](Environment* env) { delete realm; });
-  // Remove the cleanup hook to avoid deleting the realm again.
-  realm->env()->RemoveCleanupHook(DeleteMe, realm);
-}
-
-// static
-void ShadowRealm::DeleteMe(void* data) {
-  ShadowRealm* realm = static_cast<ShadowRealm*>(data);
-  // Clear the context handle to avoid invoking the weak callback again.
-  // Also, the context internal slots are cleared and the context is no longer
-  // reference to the realm.
-  delete realm;
-}
-
-ShadowRealm::ShadowRealm(Environment* env)
-    : Realm(env, NewContext(env->isolate()), kShadowRealm) {
-  context_.SetWeak(this, WeakCallback, v8::WeakCallbackType::kParameter);
-  CreateProperties();
-
-  env->TrackShadowRealm(this);
-  env->AddCleanupHook(DeleteMe, this);
-}
-
-ShadowRealm::~ShadowRealm() {
-  while (PendingCleanup()) {
-    RunCleanup();
-  }
-
-  env_->UntrackShadowRealm(this);
-
-  if (context_.IsEmpty()) {
-    // This most likely happened because the weak callback cleared it.
-    return;
-  }
-
-  {
-    HandleScope handle_scope(isolate());
-    env_->UnassignFromContext(context());
-  }
-}
-
-v8::Local<v8::Context> ShadowRealm::context() const {
-  Local<Context> ctx = PersistentToLocal::Default(isolate_, context_);
-  DCHECK(!ctx.IsEmpty());
-  return ctx;
-}
-
-// V8 can not infer reference cycles between global persistent handles, e.g.
-// the Realm's Context handle and the per-realm function handles.
-// Attach the per-realm strong persistent values' lifetime to the context's
-// global object to avoid the strong global references to the per-realm objects
-// keep the context alive indefinitely.
-#define V(PropertyName, TypeName)                                              \
-  v8::Local<TypeName> ShadowRealm::PropertyName() const {                      \
-    return PersistentToLocal::Default(isolate_, PropertyName##_);              \
-  }                                                                            \
-  void ShadowRealm::set_##PropertyName(v8::Local<TypeName> value) {            \
-    HandleScope scope(isolate_);                                               \
-    PropertyName##_.Reset(isolate_, value);                                    \
-    v8::Local<v8::Context> ctx = context();                                    \
-    if (value.IsEmpty()) {                                                     \
-      ctx->Global()                                                            \
-          ->SetPrivate(ctx,                                                    \
-                       isolate_data()->per_realm_##PropertyName(),             \
-                       v8::Undefined(isolate_))                                \
-          .ToChecked();                                                        \
-    } else {                                                                   \
-      PropertyName##_.SetWeak();                                               \
-      ctx->Global()                                                            \
-          ->SetPrivate(ctx, isolate_data()->per_realm_##PropertyName(), value) \
-          .ToChecked();                                                        \
-    }                                                                          \
-  }
-PER_REALM_STRONG_PERSISTENT_VALUES(V)
-#undef V
-
-v8::MaybeLocal<v8::Value> ShadowRealm::BootstrapRealm() {
-  HandleScope scope(isolate_);
-
-  // Skip "internal/bootstrap/node" as it installs node globals and per-isolate
-  // callbacks.
-
-  if (!env_->no_browser_globals()) {
-    if (ExecuteBootstrapper("internal/bootstrap/web/exposed-wildcard")
-            .IsEmpty()) {
-      return MaybeLocal<Value>();
-    }
-  }
-
-  // The process object is not exposed globally in ShadowRealm yet.
-  // However, the process properties need to be setup for built-in modules.
-  // Specifically, process.cwd() is needed by the ESM loader.
-  if (ExecuteBootstrapper(
-          "internal/bootstrap/switches/does_not_own_process_state")
-          .IsEmpty()) {
-    return MaybeLocal<Value>();
-  }
-
-  // Setup process.env proxy.
-  Local<String> env_string = FIXED_ONE_BYTE_STRING(isolate_, "env");
-  Local<Object> env_proxy;
-  if (!isolate_data()->env_proxy_template()->NewInstance(context()).ToLocal(
-          &env_proxy) ||
-      process_object()->Set(context(), env_string, env_proxy).IsNothing()) {
-    return MaybeLocal<Value>();
-  }
-
-  if (ExecuteBootstrapper("internal/bootstrap/shadow_realm").IsEmpty()) {
-    return MaybeLocal<Value>();
-  }
-
-  return v8::True(isolate_);
-}
-
-}  // namespace shadow_realm
-}  // namespace node
diff --git a/src/node_shadow_realm.h b/src/node_shadow_realm.h
deleted file mode 100644
index 65844349f7ab..000000000000
--- a/src/node_shadow_realm.h
+++ /dev/null
@@ -1,46 +0,0 @@
-#ifndef SRC_NODE_SHADOW_REALM_H_
-#define SRC_NODE_SHADOW_REALM_H_
-
-#if defined(NODE_WANT_INTERNALS) && NODE_WANT_INTERNALS
-
-#include "node_realm.h"
-#include "v8.h"
-
-namespace node {
-namespace shadow_realm {
-
-class ShadowRealm final : public Realm {
- public:
-  static ShadowRealm* New(Environment* env);
-
-  SET_MEMORY_INFO_NAME(ShadowRealm)
-  SET_SELF_SIZE(ShadowRealm)
-
-  v8::Local<v8::Context> context() const override;
-
-#define V(PropertyName, TypeName)                                              \
-  v8::Local<TypeName> PropertyName() const override;                           \
-  void set_##PropertyName(v8::Local<TypeName> value) override;
-  PER_REALM_STRONG_PERSISTENT_VALUES(V)
-#undef V
-
- protected:
-  v8::MaybeLocal<v8::Value> BootstrapRealm() override;
-
- private:
-  static void WeakCallback(const v8::WeakCallbackInfo<ShadowRealm>& data);
-  static void DeleteMe(void* data);
-
-  explicit ShadowRealm(Environment* env);
-  ~ShadowRealm();
-};
-
-v8::MaybeLocal<v8::Context> HostCreateShadowRealmContextCallback(
-    v8::Local<v8::Context> initiator_context);
-
-}  // namespace shadow_realm
-}  // namespace node
-
-#endif  // defined(NODE_WANT_INTERNALS) && NODE_WANT_INTERNALS
-
-#endif  // SRC_NODE_SHADOW_REALM_H_
diff --git a/test/common/globals.js b/test/common/globals.js
index 4ecc307f7655..ab5f5e76fbe8 100644
--- a/test/common/globals.js
+++ b/test/common/globals.js
@@ -49,7 +49,6 @@ const intrinsics = new Set([
   'WeakSet',
   'Proxy',
   'Reflect',
-  'ShadowRealm',
   'FinalizationRegistry',
   'WeakRef',
   'decodeURI',
diff --git a/test/fixtures/es-module-shadow-realm/custom-loaders.js b/test/fixtures/es-module-shadow-realm/custom-loaders.js
deleted file mode 100644
index bf4402250cc4..000000000000
--- a/test/fixtures/es-module-shadow-realm/custom-loaders.js
+++ /dev/null
@@ -1,15 +0,0 @@
-// This fixture is used to test that custom loaders are not enabled in the ShadowRealm.
-
-'use strict';
-const assert = require('assert');
-
-async function workInChildProcess() {
-  // Assert that the process is running with a custom loader.
-  const moduleNamespace = await import('file:///42.mjs');
-  assert.strictEqual(moduleNamespace.default, 42);
-
-  const realm = new ShadowRealm();
-  await assert.rejects(realm.importValue('file:///42.mjs', 'default'), TypeError);
-}
-
-workInChildProcess();
diff --git a/test/fixtures/es-module-shadow-realm/preload-main.js b/test/fixtures/es-module-shadow-realm/preload-main.js
deleted file mode 100644
index 4258b012ad61..000000000000
--- a/test/fixtures/es-module-shadow-realm/preload-main.js
+++ /dev/null
@@ -1,9 +0,0 @@
-// This fixture is used to test that --require preload modules are not enabled in the ShadowRealm.
-
-'use strict';
-const assert = require('assert');
-
-assert.strictEqual(globalThis.preload, 42);
-const realm = new ShadowRealm();
-const value = realm.evaluate(`globalThis.preload`);
-assert.strictEqual(value, undefined);
diff --git a/test/fixtures/es-module-shadow-realm/preload.js b/test/fixtures/es-module-shadow-realm/preload.js
deleted file mode 100644
index dbbcb65e5a17..000000000000
--- a/test/fixtures/es-module-shadow-realm/preload.js
+++ /dev/null
@@ -1 +0,0 @@
-globalThis.preload = 42;
diff --git a/test/fixtures/es-module-shadow-realm/re-export-state-counter.mjs b/test/fixtures/es-module-shadow-realm/re-export-state-counter.mjs
deleted file mode 100644
index 50a6aa3fe1e5..000000000000
--- a/test/fixtures/es-module-shadow-realm/re-export-state-counter.mjs
+++ /dev/null
@@ -1,3 +0,0 @@
-// This module verifies that the module specifier is resolved relative to the
-// current module and not the current working directory in the ShadowRealm.
-export { getCounter } from "./state-counter.mjs";
diff --git a/test/fixtures/es-module-shadow-realm/state-counter.mjs b/test/fixtures/es-module-shadow-realm/state-counter.mjs
deleted file mode 100644
index c547658bf455..000000000000
--- a/test/fixtures/es-module-shadow-realm/state-counter.mjs
+++ /dev/null
@@ -1,4 +0,0 @@
-let counter = 0;
-export const getCounter = () => {
-  return counter++;
-};
diff --git a/test/fixtures/wpt/console/console-log-shadowrealm-manual.html b/test/fixtures/wpt/console/console-log-shadowrealm-manual.html
deleted file mode 100644
index b091a850c0c9..000000000000
--- a/test/fixtures/wpt/console/console-log-shadowrealm-manual.html
+++ /dev/null
@@ -1,10 +0,0 @@
-<!DOCTYPE html>
-<mete charset=utf-8>
-<title>Console Logging Manual Test</title>
-<p>Open the console inside the developer tools. It should contain one entry saying "test passed".</p>
-<script>
-const sr = new ShadowRealm();
-sr.evaluate(`
-  console.log("test passed");
-`);
-</script>
diff --git a/test/fixtures/wpt/console/idlharness-shadowrealm.window.js b/test/fixtures/wpt/console/idlharness-shadowrealm.window.js
deleted file mode 100644
index 8f68252dcd2b..000000000000
--- a/test/fixtures/wpt/console/idlharness-shadowrealm.window.js
+++ /dev/null
@@ -1,5 +0,0 @@
-// META: script=/resources/idlharness-shadowrealm.js
-
-// https://console.spec.whatwg.org/
-
-idl_test_shadowrealm(["console"], []);
diff --git a/test/fixtures/wpt/dom/abort/timeout-shadowrealm.any.js b/test/fixtures/wpt/dom/abort/timeout-shadowrealm.any.js
deleted file mode 100644
index c87b047c2212..000000000000
--- a/test/fixtures/wpt/dom/abort/timeout-shadowrealm.any.js
+++ /dev/null
@@ -1,5 +0,0 @@
-// META: global=shadowrealm
-
-test(t => {
-  assert_not_own_property(AbortSignal, "timeout", "AbortSignal does not have a 'timeout' property");
-}, "AbortSignal.timeout() is not exposed in ShadowRealm");
diff --git a/test/fixtures/wpt/encoding/idlharness-shadowrealm.window.js b/test/fixtures/wpt/encoding/idlharness-shadowrealm.window.js
deleted file mode 100644
index baf3efcbb027..000000000000
--- a/test/fixtures/wpt/encoding/idlharness-shadowrealm.window.js
+++ /dev/null
@@ -1,2 +0,0 @@
-// META: script=/resources/idlharness-shadowrealm.js
-idl_test_shadowrealm(["encoding"], ["streams"]);
diff --git a/test/fixtures/wpt/hr-time/idlharness-shadowrealm.window.js b/test/fixtures/wpt/hr-time/idlharness-shadowrealm.window.js
deleted file mode 100644
index 3209db5f41b7..000000000000
--- a/test/fixtures/wpt/hr-time/idlharness-shadowrealm.window.js
+++ /dev/null
@@ -1,2 +0,0 @@
-// META: script=/resources/idlharness-shadowrealm.js
-idl_test_shadowrealm(["hr-time"], ["html", "dom"]);
diff --git a/test/fixtures/wpt/performance-timeline/idlharness-shadowrealm.window.js b/test/fixtures/wpt/performance-timeline/idlharness-shadowrealm.window.js
deleted file mode 100644
index 6caaa3306132..000000000000
--- a/test/fixtures/wpt/performance-timeline/idlharness-shadowrealm.window.js
+++ /dev/null
@@ -1,2 +0,0 @@
-// META: script=/resources/idlharness-shadowrealm.js
-idl_test_shadowrealm(["performance-timeline"], ["hr-time", "dom"]);
diff --git a/test/fixtures/wpt/user-timing/idlharness-shadowrealm.window.js b/test/fixtures/wpt/user-timing/idlharness-shadowrealm.window.js
deleted file mode 100644
index 340da96f749d..000000000000
--- a/test/fixtures/wpt/user-timing/idlharness-shadowrealm.window.js
+++ /dev/null
@@ -1,2 +0,0 @@
-// META: script=/resources/idlharness-shadowrealm.js
-idl_test_shadowrealm(["user-timing"], ["hr-time", "performance-timeline", "dom"]);
diff --git a/test/parallel/test-shadow-realm-allowed-builtin-modules.js b/test/parallel/test-shadow-realm-allowed-builtin-modules.js
deleted file mode 100644
index 2aa550ac7bb5..000000000000
--- a/test/parallel/test-shadow-realm-allowed-builtin-modules.js
+++ /dev/null
@@ -1,21 +0,0 @@
-// Flags: --experimental-shadow-realm
-'use strict';
-const common = require('../common');
-const assert = require('assert');
-
-async function main() {
-  // Verifies that builtin modules can not be imported in the ShadowRealm.
-  const realm = new ShadowRealm();
-  // The error object created inside the ShadowRealm with the error code
-  // property is not copied on the realm boundary. Only the error message
-  // is copied. Simply check the error message here.
-  await assert.rejects(realm.importValue('fs', 'readFileSync'), {
-    message: /Cannot find package 'fs'/,
-  });
-  // As above, we can only validate the error message, not the error code.
-  await assert.rejects(realm.importValue('node:fs', 'readFileSync'), {
-    message: /No such built-in module: node:fs/,
-  });
-}
-
-main().then(common.mustCall());
diff --git a/test/parallel/test-shadow-realm-custom-loaders.js b/test/parallel/test-shadow-realm-custom-loaders.js
deleted file mode 100644
index 80cda74bb889..000000000000
--- a/test/parallel/test-shadow-realm-custom-loaders.js
+++ /dev/null
@@ -1,26 +0,0 @@
-'use strict';
-const common = require('../common');
-const fixtures = require('../common/fixtures');
-const assert = require('assert');
-
-const commonArgs = [
-  '--experimental-shadow-realm',
-  '--no-warnings',
-];
-
-async function main() {
-  // Verifies that custom loaders are not enabled in the ShadowRealm.
-  const child = await common.spawnPromisified(process.execPath, [
-    ...commonArgs,
-    '--experimental-loader',
-    fixtures.fileURL('es-module-loaders', 'loader-resolve-shortcircuit.mjs'),
-    '--experimental-loader',
-    fixtures.fileURL('es-module-loaders', 'loader-load-foo-or-42.mjs'),
-    fixtures.path('es-module-shadow-realm', 'custom-loaders.js'),
-  ]);
-
-  assert.strictEqual(child.stderr, '');
-  assert.strictEqual(child.code, 0);
-}
-
-main().then(common.mustCall());
diff --git a/test/parallel/test-shadow-realm-gc-module.js b/test/parallel/test-shadow-realm-gc-module.js
deleted file mode 100644
index 6077bf03146d..000000000000
--- a/test/parallel/test-shadow-realm-gc-module.js
+++ /dev/null
@@ -1,18 +0,0 @@
-// Flags: --experimental-shadow-realm --max-old-space-size=20
-'use strict';
-
-/**
- * Verifying modules imported by ShadowRealm instances can be correctly
- * garbage collected.
- */
-
-const common = require('../common');
-const fixtures = require('../common/fixtures');
-const { runAndBreathe } = require('../common/gc');
-
-const mod = fixtures.fileURL('es-module-shadow-realm', 'state-counter.mjs');
-
-runAndBreathe(async () => {
-  const realm = new ShadowRealm();
-  await realm.importValue(mod, 'getCounter');
-}, 100).then(common.mustCall());
diff --git a/test/parallel/test-shadow-realm-gc.js b/test/parallel/test-shadow-realm-gc.js
deleted file mode 100644
index c6de4a32a88f..000000000000
--- a/test/parallel/test-shadow-realm-gc.js
+++ /dev/null
@@ -1,24 +0,0 @@
-// Flags: --experimental-shadow-realm --max-old-space-size=20
-'use strict';
-
-/**
- * Verifying ShadowRealm instances can be correctly garbage collected.
- */
-
-const common = require('../common');
-const { runAndBreathe } = require('../common/gc');
-const assert = require('assert');
-const { isMainThread, Worker } = require('worker_threads');
-
-runAndBreathe(() => {
-  const realm = new ShadowRealm();
-  realm.evaluate('new TextEncoder(); 1;');
-}, 100).then(common.mustCall());
-
-// Test it in worker too.
-if (isMainThread) {
-  const worker = new Worker(__filename);
-  worker.on('exit', common.mustCall((code) => {
-    assert.strictEqual(code, 0);
-  }));
-}
diff --git a/test/parallel/test-shadow-realm-globals.js b/test/parallel/test-shadow-realm-globals.js
deleted file mode 100644
index 8e0107597985..000000000000
--- a/test/parallel/test-shadow-realm-globals.js
+++ /dev/null
@@ -1,27 +0,0 @@
-// Flags: --experimental-shadow-realm
-'use strict';
-
-require('../common');
-const { intrinsics, webIdlExposedWildcard } = require('../common/globals');
-const assert = require('assert');
-
-// Validates APIs exposed on the ShadowRealm globalThis.
-const shadowRealm = new ShadowRealm();
-const itemsStr = shadowRealm.evaluate(`
-(() => {
-  return Object.getOwnPropertyNames(globalThis).join(',');
-})();
-`);
-const items = itemsStr.split(',');
-const leaks = [];
-for (const item of items) {
-  if (intrinsics.has(item)) {
-    continue;
-  }
-  if (webIdlExposedWildcard.has(item)) {
-    continue;
-  }
-  leaks.push(item);
-}
-
-assert.deepStrictEqual(leaks, []);
diff --git a/test/parallel/test-shadow-realm-import-value-resolve.js b/test/parallel/test-shadow-realm-import-value-resolve.js
deleted file mode 100644
index eeb00509d53a..000000000000
--- a/test/parallel/test-shadow-realm-import-value-resolve.js
+++ /dev/null
@@ -1,31 +0,0 @@
-// Flags: --experimental-shadow-realm
-'use strict';
-const common = require('../common');
-const assert = require('assert');
-const path = require('path');
-const { isMainThread } = require('worker_threads');
-
-if (!isMainThread) {
-  common.skip('This test only works on a main thread');
-}
-
-async function main() {
-  const realm = new ShadowRealm();
-
-  const dirname = __dirname;
-  // Set process cwd to the parent directory of __dirname.
-  const cwd = path.dirname(dirname);
-  process.chdir(cwd);
-  // Hardcode the relative path to ensure the string is still a valid relative
-  // URL string.
-  const relativePath = './fixtures/es-module-shadow-realm/re-export-state-counter.mjs';
-
-  // Make sure that the module can not be resolved relative to __filename.
-  assert.throws(() => require.resolve(relativePath), { code: 'MODULE_NOT_FOUND' });
-
-  // Resolve relative to the current working directory.
-  const getCounter = await realm.importValue(relativePath, 'getCounter');
-  assert.strictEqual(typeof getCounter, 'function');
-}
-
-main().then(common.mustCall());
diff --git a/test/parallel/test-shadow-realm-module.js b/test/parallel/test-shadow-realm-module.js
deleted file mode 100644
index bc0c2c04f69f..000000000000
--- a/test/parallel/test-shadow-realm-module.js
+++ /dev/null
@@ -1,29 +0,0 @@
-// Flags: --experimental-shadow-realm
-'use strict';
-const common = require('../common');
-const fixtures = require('../common/fixtures');
-const assert = require('assert');
-
-async function main() {
-  const realm = new ShadowRealm();
-  const mod = fixtures.fileURL('es-module-shadow-realm', 'state-counter.mjs');
-  const getCounter = await realm.importValue(mod, 'getCounter');
-  assert.strictEqual(getCounter(), 0);
-  const getCounter1 = await realm.importValue(mod, 'getCounter');
-  // Returned value is a newly wrapped function.
-  assert.notStrictEqual(getCounter, getCounter1);
-  // Verify that the module state is shared between two `importValue` calls.
-  assert.strictEqual(getCounter1(), 1);
-  assert.strictEqual(getCounter(), 2);
-
-  const { getCounter: getCounterThisRealm } = await import(mod);
-  assert.notStrictEqual(getCounterThisRealm, getCounter);
-  // Verify that the module state is not shared between two realms.
-  assert.strictEqual(getCounterThisRealm(), 0);
-  assert.strictEqual(getCounter(), 3);
-
-  // Verify that shadow realm rejects to import a non-existing module.
-  await assert.rejects(realm.importValue('non-exists', 'exports'), TypeError);
-}
-
-main().then(common.mustCall());
diff --git a/test/parallel/test-shadow-realm-preload-module.js b/test/parallel/test-shadow-realm-preload-module.js
deleted file mode 100644
index ebd29c1c4a8b..000000000000
--- a/test/parallel/test-shadow-realm-preload-module.js
+++ /dev/null
@@ -1,20 +0,0 @@
-'use strict';
-const common = require('../common');
-const fixtures = require('../common/fixtures');
-const { spawnSyncAndExitWithoutError } = require('../common/child_process');
-
-const commonArgs = [
-  '--experimental-shadow-realm',
-];
-
-async function main() {
-  // Verifies that --require preload modules are not enabled in the ShadowRealm.
-  spawnSyncAndExitWithoutError(process.execPath, [
-    ...commonArgs,
-    '--require',
-    fixtures.path('es-module-shadow-realm', 'preload.js'),
-    fixtures.path('es-module-shadow-realm', 'preload-main.js'),
-  ]);
-}
-
-main().then(common.mustCall());
diff --git a/test/parallel/test-shadow-realm-prepare-stack-trace.js b/test/parallel/test-shadow-realm-prepare-stack-trace.js
deleted file mode 100644
index 2460f017ee91..000000000000
--- a/test/parallel/test-shadow-realm-prepare-stack-trace.js
+++ /dev/null
@@ -1,53 +0,0 @@
-// Flags: --experimental-shadow-realm
-'use strict';
-
-require('../common');
-const assert = require('assert');
-
-let principalRealmPrepareStackTraceCalled = false;
-Error.prepareStackTrace = (error, trace) => {
-  principalRealmPrepareStackTraceCalled = true;
-  return `${String(error)}\n    at ${trace.join('\n    at ')}`;
-};
-
-{
-  // Validates inner Error.prepareStackTrace can not leak into the outer realm.
-  const shadowRealm = new ShadowRealm();
-
-  const stack = shadowRealm.evaluate(`
-Error.prepareStackTrace = (error, trace) => {
-  globalThis.leaked = 'inner';
-  return 'from shadow realm';
-};
-
-try {
-  throw new Error('boom');
-} catch (e) {
-  e.stack;
-}
-`);
-  assert.ok(!principalRealmPrepareStackTraceCalled);
-  assert.strictEqual(stack, 'from shadow realm');
-  assert.strictEqual('leaked' in globalThis, false);
-}
-
-{
-  // Validates stacks can be generated in the ShadowRealm.
-  const shadowRealm = new ShadowRealm();
-
-  const stack = shadowRealm.evaluate(`
-function myFunc() {
-  throw new Error('boom');
-}
-
-try {
-  myFunc();
-} catch (e) {
-  e.stack;
-}
-`);
-  assert.ok(!principalRealmPrepareStackTraceCalled);
-  const lines = stack.split('\n');
-  assert.strictEqual(lines[0], 'Error: boom');
-  assert.match(lines[1], /^ {4}at myFunc \(.*\)/);
-}
diff --git a/test/parallel/test-shadow-realm.js b/test/parallel/test-shadow-realm.js
deleted file mode 100644
index 0b20265537fb..000000000000
--- a/test/parallel/test-shadow-realm.js
+++ /dev/null
@@ -1,12 +0,0 @@
-// Flags: --experimental-shadow-realm
-'use strict';
-
-require('../common');
-const assert = require('assert');
-
-// Validates we can construct ShadowRealm successfully.
-const shadowRealm = new ShadowRealm();
-
-const getter = shadowRealm.evaluate('globalThis.realmValue = "inner"; () => globalThis.realmValue;');
-assert.strictEqual(getter(), 'inner');
-assert.strictEqual('realmValue' in globalThis, false);
diff --git a/test/pummel/test-heapdump-shadow-realm.js b/test/pummel/test-heapdump-shadow-realm.js
deleted file mode 100644
index 66c32986b4c8..000000000000
--- a/test/pummel/test-heapdump-shadow-realm.js
+++ /dev/null
@@ -1,39 +0,0 @@
-// Flags: --experimental-shadow-realm
-// This tests heap snapshot integration of ShadowRealm
-
-'use strict';
-require('../common');
-const { validateByRetainingPath } = require('../common/heap');
-const assert = require('assert');
-
-// Before shadow realm is created, no ShadowRealm should be captured.
-{
-  const nodes = validateByRetainingPath('Node / ShadowRealm', []);
-  assert.strictEqual(nodes.length, 0);
-}
-
-let realm;
-let counter = 0;
-// Create a bunch of un-referenced ShadowRealms to make sure the heap
-// snapshot can handle it.
-function createRealms() {
-  // Use setImmediate to give GC some time to kick in to avoid OOM.
-  if (counter++ < 10) {
-    realm = new ShadowRealm();
-    realm.evaluate('undefined');
-    setImmediate(createRealms);
-  } else {
-    validateHeap();
-    // Keep the realm alive.
-    realm.evaluate('undefined');
-  }
-}
-
-function validateHeap() {
-  validateByRetainingPath('Node / Environment', [
-    { node_name: 'Node / shadow_realms', edge_name: 'shadow_realms' },
-    { node_name: 'Node / ShadowRealm' },
-  ]);
-}
-
-createRealms();
diff --git a/test/wpt/status/compression.json b/test/wpt/status/compression.json
index 5c73f02a5871..0538767b6c0f 100644
--- a/test/wpt/status/compression.json
+++ b/test/wpt/status/compression.json
@@ -2,9 +2,6 @@
   "compression-with-detach.window.js": {
     "requires": ["crypto"]
   },
-  "idlharness-shadowrealm.window.js": {
-    "skip": "ShadowRealm support is not enabled"
-  },
   "third_party/pako/pako_inflate.min.js": {
     "skip": "This is not a test file."
   }
diff --git a/test/wpt/status/console.json b/test/wpt/status/console.json
index ba74911d66fd..b8f635563995 100644
--- a/test/wpt/status/console.json
+++ b/test/wpt/status/console.json
@@ -2,8 +2,5 @@
   "idlharness.any.js": {
     "note": "https://github.com/nodejs/node/issues/44185",
     "requires": ["crypto", "inspector", "small-icu"]
-  },
-  "idlharness-shadowrealm.window.js": {
-    "skip": "ShadowRealm support is not enabled"
   }
 }
diff --git a/test/wpt/status/dom/abort.json b/test/wpt/status/dom/abort.json
index 2ff9cc355d6a..0967ef424bce 100644
--- a/test/wpt/status/dom/abort.json
+++ b/test/wpt/status/dom/abort.json
@@ -1,5 +1 @@
-{
-  "timeout-shadowrealm.any.js": {
-    "skip": "ShadowRealm support is not enabled"
-  }
-}
+{}
diff --git a/test/wpt/status/encoding.json b/test/wpt/status/encoding.json
index c258031e4855..4f5144f42237 100644
--- a/test/wpt/status/encoding.json
+++ b/test/wpt/status/encoding.json
@@ -39,9 +39,6 @@
   "idlharness.any.js": {
     "requires": ["small-icu"]
   },
-  "idlharness-shadowrealm.window.js": {
-    "skip": "ShadowRealm support is not enabled"
-  },
   "replacement-encodings.any.js": {
     "skip": "decoding-helpers.js needs XMLHttpRequest"
   },
diff --git a/test/wpt/status/hr-time.cjs b/test/wpt/status/hr-time.cjs
index 35b82c87a1ea..534822b4d316 100644
--- a/test/wpt/status/hr-time.cjs
+++ b/test/wpt/status/hr-time.cjs
@@ -27,10 +27,6 @@ module.exports = {
     },
   },
 
-  'idlharness-shadowrealm.window.js': {
-    skip: 'ShadowRealm support is not enabled',
-  },
-
   'window-worker-timeOrigin.window.js': {
     skip: 'depends on URL.createObjectURL(blob)',
   },
diff --git a/test/wpt/status/performance-timeline.json b/test/wpt/status/performance-timeline.json
index 799ee97538d0..d350b5437fe7 100644
--- a/test/wpt/status/performance-timeline.json
+++ b/test/wpt/status/performance-timeline.json
@@ -69,9 +69,6 @@
       ]
     }
   },
-  "idlharness-shadowrealm.window.js": {
-    "skip": "ShadowRealm support is not enabled"
-  },
   "droppedentriescount.any.js": {
     "skip": "WPTRunner does not support fetch()"
   }
diff --git a/test/wpt/status/streams.json b/test/wpt/status/streams.json
index 968b33597651..a43ceaa17d24 100644
--- a/test/wpt/status/streams.json
+++ b/test/wpt/status/streams.json
@@ -1,7 +1,4 @@
 {
-  "idlharness-shadowrealm.window.js": {
-    "skip": "ShadowRealm support is not enabled"
-  },
   "queuing-strategies-size-function-per-global.window.js": {
     "skip": "Browser-specific test"
   },
diff --git a/test/wpt/status/user-timing.json b/test/wpt/status/user-timing.json
index 7e0e70dcf20f..6e2b6e276ccd 100644
--- a/test/wpt/status/user-timing.json
+++ b/test/wpt/status/user-timing.json
@@ -1,7 +1,4 @@
 {
-  "idlharness-shadowrealm.window.js": {
-    "skip": "ShadowRealm support is not enabled"
-  },
   "invoke_with_timing_attributes.worker.js": {
     "skip": "importScripts not supported"
   },