wasi: require CLI flag to require() wasi module

This commit ensures that the WASI module cannot be require()'ed
without a CLI flag while the module is still experimental.
This fixes a regression from
#30778.
PR-URL: #30963
Reviewed-By: Anna Henningsen <anna@addaleax.net>
Reviewed-By: Richard Lau <riclau@uk.ibm.com>
Reviewed-By: Ruben Bridgewater <ruben@bridgewater.de>
Reviewed-By: James M Snell <jasnell@gmail.com>
Reviewed-By: Rich Trott <rtrott@gmail.com>
Reviewed-By: David Carlier <devnexen@gmail.com>

Author: cjihrig

lib/internal/bootstrap/pre_execution.js

@@ -402,11 +402,10 @@ function initializePolicy() {
 }
 
 functioninitializeWASI(){
-if(getOptionValue('--experimental-wasi-unstable-preview0')){
-const{ NativeModule }=require('internal/bootstrap/loaders');
-constmod=NativeModule.map.get('wasi');
-mod.canBeRequiredByUsers=true;
-}
+const{ NativeModule }=require('internal/bootstrap/loaders');
+constmod=NativeModule.map.get('wasi');
+mod.canBeRequiredByUsers=
+getOptionValue('--experimental-wasi-unstable-preview0');
 }
 
 functioninitializeCJSLoader(){

src/node_native_module.cc

@@ -98,6 +98,7 @@ void NativeModuleLoader::InitializeModuleCategories() {
 #endif// !HAVE_OPENSSL
 
 "sys", // Deprecated.
+"wasi", // Experimental.
 "internal/test/binding",
 "internal/v8_prof_polyfill",
 "internal/v8_prof_processor",

test/wasi/test-wasi-require-flag.js

@@ -0,0 +1,9 @@
+'use strict';
+// This test verifies that the WASI module cannot be require()'ed without a
+// CLI flag while it is still experimental.
+require('../common');
+constassert=require('assert');
+
+assert.throws(()=>{
+require('wasi');
+},/^Error:Cannotfindmodule'wasi'/);