cli: remove --no-experimental-fetch flag

doc/api/cli.md

@@ -1362,14 +1362,6 @@ added: v0.8.0
 
 Silence deprecation warnings.
 
-### `--no-experimental-fetch`
-
-<!-- YAML
-added: v18.0.0
--->
-
-Disable exposition of [Fetch API][] on the global scope.
-
 ### `--no-experimental-global-customevent`
 
 <!-- YAML
@@ -2688,7 +2680,6 @@ one is included in the list below.
 * `--network-family-autoselection-attempt-timeout`
 * `--no-addons`
 * `--no-deprecation`
-* `--no-experimental-fetch`
 * `--no-experimental-global-customevent`
 * `--no-experimental-global-navigator`
 * `--no-experimental-repl-await`
@@ -3164,7 +3155,6 @@ node --stack-trace-limit=12 -p -e "Error.stackTraceLimit" # prints 12
 [DEP0025 warning]: deprecations.md#dep0025-requirenodesys
 [ECMAScript module]: esm.md#modules-ecmascript-modules
 [ExperimentalWarning: `vm.measureMemory` is an experimental feature]: vm.md#vmmeasurememoryoptions
-[Fetch API]: https://developer.mozilla.org/en-US/docs/Web/API/Fetch_API
 [File System Permissions]: permissions.md#file-system-permissions
 [Loading ECMAScript modules using `require()`]: modules.md#loading-ecmascript-modules-using-require
 [Module customization hooks]: module.md#customization-hooks

doc/node.1

@@ -183,9 +183,6 @@ Use this flag to enable ShadowRealm support.
 .It Fl -experimental-test-coverage
 Enable code coverage in the test runner.
 .
-.It Fl -no-experimental-fetch
-Disable experimental support for the Fetch API.
-.
 .It Fl -no-experimental-websocket
 Disable experimental support for the WebSocket API.
 .

lib/internal/process/pre_execution.js

@@ -103,7 +103,7 @@ function prepareExecution(options) {
   setupInspectorHooks();
   setupNavigator();
   setupWarningHandler();
-  setupUndici();
+  setupWebsocket();
   setupCustomEvent();
   setupCodeCoverage();
   setupDebugEnv();
@@ -308,17 +308,8 @@ function setupWarningHandler() {
   }
 }
 
-// https://fetch.spec.whatwg.org/
 // https://websockets.spec.whatwg.org/
-function setupUndici() {
-  if (getOptionValue('--no-experimental-fetch')) {
-    delete globalThis.fetch;
-    delete globalThis.FormData;
-    delete globalThis.Headers;
-    delete globalThis.Request;
-    delete globalThis.Response;
-  }
-
+function setupWebsocket() {
   if (getOptionValue('--no-experimental-websocket')) {
     delete globalThis.WebSocket;
   }

src/node_options.cc

@@ -396,11 +396,7 @@ EnvironmentOptionsParser::EnvironmentOptionsParser() {
             &EnvironmentOptions::enable_source_maps,
             kAllowedInEnvvar);
   AddOption("--experimental-abortcontroller", "", NoOp{}, kAllowedInEnvvar);
-  AddOption("--experimental-fetch",
-            "experimental Fetch API",
-            &EnvironmentOptions::experimental_fetch,
-            kAllowedInEnvvar,
-            true);
+  AddOption("--experimental-fetch", "", NoOp{}, kAllowedInEnvvar);
   AddOption("--experimental-websocket",
             "experimental WebSocket API",
             &EnvironmentOptions::experimental_websocket,

test/parallel/test-process-env-allowed-flags-are-documented.js

@@ -99,6 +99,7 @@ const undocumented = difference(process.allowedNodeEnvironmentFlags,
 assert(undocumented.delete('--debug-arraybuffer-allocations'));
 assert(undocumented.delete('--no-debug-arraybuffer-allocations'));
 assert(undocumented.delete('--es-module-specifier-resolution'));
+assert(undocumented.delete('--experimental-fetch'));
 assert(undocumented.delete('--experimental-global-webcrypto'));
 assert(undocumented.delete('--experimental-report'));
 assert(undocumented.delete('--experimental-worker'));