module: add prefix-only modules to module.builtinModules

Fixes nodejs#42785

Author: ljharb

doc/api/module.md

@@ -28,7 +28,7 @@ added:
 A list of the names of all modules provided by Node.js. Can be used to verify
 if a module is maintained by a third party or not.
 
-Note: the list doesn't contain [prefix-only modules][] like `node:test`.
+Note: the list also contains [prefix-only modules][] like `node:test`.
 
 `module` in this context isn't the same object that's provided
 by the [module wrapper][]. To access it, require the `Module` module:

doc/api/modules.md

@@ -513,7 +513,7 @@ Some built-in modules are always preferentially loaded if their identifier is
 passed to `require()`. For instance, `require('http')` will always
 return the built-in HTTP module, even if there is a file by that name. The list
 of built-in modules that can be loaded without using the `node:` prefix is exposed
-as [`module.builtinModules`][].
+in [`module.builtinModules`][], listed without the prefix.
 
 ### Built-in modules with mandatory `node:` prefix
 
@@ -527,6 +527,8 @@ taken the name. Currently the built-in modules that requires the `node:` prefix
 * [`node:test`][]
 * [`node:test/reporters`][]
 
+The list of these modules is exposed in [`module.builtinModules`][], including the prefix.
+
 ## Cycles
 
 <!--type=misc-->

lib/internal/bootstrap/realm.js

@@ -320,14 +320,17 @@ class BuiltinModule {
     );
   }
 
-  static getCanBeRequiredByUsersWithoutSchemeList() {
-    return ArrayFrom(canBeRequiredByUsersWithoutSchemeList);
-  }
-
   static getSchemeOnlyModuleNames() {
     return ArrayFrom(schemelessBlockList);
   }
 
+  static getAllBuiltinModuleIds() {
+    return [
+      ...canBeRequiredByUsersWithoutSchemeList,
+      ...ArrayFrom(schemelessBlockList, (x) => `node:${x}`),
+    ];
+  }
+
   // Used by user-land module loaders to compile and load builtins.
   compileForPublicLoader() {
     if (!BuiltinModule.canBeRequiredByUsers(this.id)) {

lib/internal/modules/cjs/loader.js

@@ -434,8 +434,8 @@ Module.isBuiltin = BuiltinModule.isBuiltin;
  */
 function initializeCJS() {
   // This need to be done at runtime in case --expose-internals is set.
-  const builtinModules = BuiltinModule.getCanBeRequiredByUsersWithoutSchemeList();
-  Module.builtinModules = ObjectFreeze(builtinModules);
+
+  Module.builtinModules = ObjectFreeze(BuiltinModule.getAllBuiltinModuleIds());
 
   initializeCjsConditions();
 

lib/repl.js

@@ -131,7 +131,7 @@ const { shouldColorize } = require('internal/util/colors');
 const CJSModule = require('internal/modules/cjs/loader').Module;
 let _builtinLibs = ArrayPrototypeFilter(
   CJSModule.builtinModules,
-  (e) => e[0] !== '_',
+  (e) => e[0] !== '_' && !StringPrototypeStartsWith(e, 'node:'),
 );
 const nodeSchemeBuiltinLibs = ArrayPrototypeMap(
   _builtinLibs, (lib) => `node:${lib}`);

test/parallel/test-internal-module-require.js

@@ -87,6 +87,9 @@ if (process.argv[2] === 'child') {
         });
       } else {
         require(id);
+        if (!id.startsWith('node:')) {
+          require(`node:${id}`);
+        }
         publicModules.add(id);
       }
     }

test/parallel/test-process-get-builtin.mjs

@@ -41,15 +41,19 @@ for (const id of publicBuiltins) {
 }
 // Check that import(id).default returns the same thing as process.getBuiltinModule(id).
 for (const id of publicBuiltins) {
-  const imported = await import(`node:${id}`);
-  assert.strictEqual(process.getBuiltinModule(id), imported.default);
+  if (!id.startsWith('node:')) {
+    const imported = await import(`node:${id}`);
+    assert.strictEqual(process.getBuiltinModule(id), imported.default);
+  }
 }
 
 // publicBuiltins does not include 'test' which requires the node: prefix.
 const ids = publicBuiltins.add('test');
 // Check that import(id).default returns the same thing as process.getBuiltinModule(id).
 for (const id of ids) {
-  const prefixed = `node:${id}`;
-  const imported = await import(prefixed);
-  assert.strictEqual(process.getBuiltinModule(prefixed), imported.default);
+  if (!id.startsWith('node:')) {
+    const prefixed = `node:${id}`;
+    const imported = await import(prefixed);
+    assert.strictEqual(process.getBuiltinModule(prefixed), imported.default);
+  }
 }

test/parallel/test-repl-tab-complete-import.js

@@ -32,10 +32,12 @@ testMe._domain.on('error', assert.ifError);
 testMe.complete('import(\'', common.mustCall((error, data) => {
   assert.strictEqual(error, null);
   publicModules.forEach((lib) => {
-    assert(
-      data[0].includes(lib) && data[0].includes(`node:${lib}`),
-      `${lib} not found`,
-    );
+    if (!lib.startsWith('node:')) {
+      assert(
+        data[0].includes(lib) && data[0].includes(`node:${lib}`),
+        `${lib} not found`,
+      );
+    }
   });
   const newModule = 'foobar';
   assert(!builtinModules.includes(newModule));
@@ -55,7 +57,7 @@ testMe.complete("import\t( 'n", common.mustCall((error, data) => {
   // import(...) completions include `node:` URL modules:
   let lastIndex = -1;
 
-  publicModules.forEach((lib, index) => {
+  publicModules.filter((lib) => !lib.startsWith('node:')).forEach((lib, index) => {
     lastIndex = completions.indexOf(`node:${lib}`);
     assert.notStrictEqual(lastIndex, -1);
   });

test/parallel/test-repl-tab-complete.js

@@ -275,7 +275,7 @@ testMe.complete('require(\'', common.mustCall(function(error, data) {
   assert.strictEqual(error, null);
   publicModules.forEach((lib) => {
     assert(
-      data[0].includes(lib) && data[0].includes(`node:${lib}`),
+      data[0].includes(lib) && (lib.startsWith('node:') || data[0].includes(`node:${lib}`)),
       `${lib} not found`
     );
   });
@@ -295,7 +295,7 @@ testMe.complete("require\t( 'n", common.mustCall(function(error, data) {
   // require(...) completions include `node:`-prefixed modules:
   let lastIndex = -1;
 
-  publicModules.forEach((lib, index) => {
+  publicModules.filter((lib) => !lib.startsWith('node:')).forEach((lib, index) => {
     lastIndex = data[0].indexOf(`node:${lib}`);
     assert.notStrictEqual(lastIndex, -1);
   });

test/parallel/test-require-resolve.js

@@ -61,10 +61,9 @@ require(fixtures.path('resolve-paths', 'default', 'verify-paths.js'));
   // builtinModules.
   builtinModules.forEach((mod) => {
     assert.strictEqual(require.resolve.paths(mod), null);
-  });
-
-  builtinModules.forEach((mod) => {
-    assert.strictEqual(require.resolve.paths(`node:${mod}`), null);
+    if (!mod.startsWith('node:')) {
+      assert.strictEqual(require.resolve.paths(`node:${mod}`), null);
+    }
   });
 
   // node_modules.