esm: use "node:" namespace for builtins

PR-URL: https://github.com/nodejs/node/pull/35387
Reviewed-By: Michaël Zasso <targos@protonmail.com>
Reviewed-By: Bradley Farias <bradley.meck@gmail.com>
Reviewed-By: Jan Krems <jan.krems@gmail.com>
Reviewed-By: Matteo Collina <matteo.collina@gmail.com>

doc/api/esm.md

@@ -1003,7 +1003,7 @@ The resolver can throw the following errors:
 > 1. If _selfUrl_ is not **undefined**, return _selfUrl_.
 > 1. If _packageSubpath_ is _"."_ and _packageName_ is a Node.js builtin
 >    module, then
->    1. Return the string _"nodejs:"_ concatenated with _packageSpecifier_.
+>    1. Return the string _"node:"_ concatenated with _packageSpecifier_.
 > 1. While _parentURL_ is not the file system root,
 >    1. Let _packageURL_ be the URL resolution of _"node_modules/"_
 >       concatenated with _packageSpecifier_, relative to _parentURL_.

lib/internal/modules/esm/get_format.js

@@ -34,7 +34,7 @@ if (experimentalJsonModules)
   extensionFormatMap['.json'] = legacyExtensionFormatMap['.json'] = 'json';
 
 function defaultGetFormat(url, context, defaultGetFormatUnused) {
-  if (StringPrototypeStartsWith(url, 'nodejs:')) {
+  if (StringPrototypeStartsWith(url, 'node:')) {
     return { format: 'builtin' };
   }
   const parsed = new URL(url);

lib/internal/modules/esm/resolve.js

@@ -776,13 +776,13 @@ function defaultResolve(specifier, context = {}, defaultResolveUnused) {
       };
     }
   } catch {}
-  if (parsed && parsed.protocol === 'nodejs:')
+  if (parsed && parsed.protocol === 'node:')
     return { url: specifier };
   if (parsed && parsed.protocol !== 'file:' && parsed.protocol !== 'data:')
     throw new ERR_UNSUPPORTED_ESM_URL_SCHEME(parsed);
   if (NativeModule.canBeRequiredByUsers(specifier)) {
     return {
-      url: 'nodejs:' + specifier
+      url: 'node:' + specifier
     };
   }
   if (parentURL && StringPrototypeStartsWith(parentURL, 'data:')) {

lib/internal/modules/esm/translators.js

@@ -223,11 +223,11 @@ function cjsPreparseModuleExports(filename) {
 // through normal resolution
 translators.set('builtin', async function builtinStrategy(url) {
   debug(`Translating BuiltinModule ${url}`);
-  // Slice 'nodejs:' scheme
-  const id = url.slice(7);
+  // Slice 'node:' scheme
+  const id = url.slice(5);
   const module = loadNativeModule(id, url, true);
-  if (!url.startsWith('nodejs:') || !module) {
-    throw new ERR_UNKNOWN_BUILTIN_MODULE(id);
+  if (!url.startsWith('node:') || !module) {
+    throw new ERR_UNKNOWN_BUILTIN_MODULE(url);
   }
   debug(`Loading BuiltinModule ${url}`);
   return module.getESMFacade();

test/es-module/test-esm-dynamic-import.js

@@ -48,9 +48,9 @@ function expectFsNamespace(result) {
   expectFsNamespace(import('fs'));
   expectFsNamespace(eval('import("fs")'));
   expectFsNamespace(eval('import("fs")'));
-  expectFsNamespace(import('nodejs:fs'));
+  expectFsNamespace(import('node:fs'));
 
-  expectModuleError(import('nodejs:unknown'),
+  expectModuleError(import('node:unknown'),
                     'ERR_UNKNOWN_BUILTIN_MODULE');
   expectModuleError(import('./not-an-existing-module.mjs'),
                     'ERR_MODULE_NOT_FOUND');

test/fixtures/es-module-loaders/builtin-named-exports-loader.mjs

@@ -15,7 +15,7 @@ export function getGlobalPreloadCode() {
 
 export function resolve(specifier, context, defaultResolve) {
   const def = defaultResolve(specifier, context);
-  if (def.url.startsWith('nodejs:')) {
+  if (def.url.startsWith('node:')) {
     return {
       url: `custom-${def.url}`,
     };
@@ -24,7 +24,7 @@ export function resolve(specifier, context, defaultResolve) {
 }
 
 export function getSource(url, context, defaultGetSource) {
-  if (url.startsWith('custom-nodejs:')) {
+  if (url.startsWith('custom-node:')) {
     const urlObj = new URL(url);
     return {
       source: generateBuiltinModule(urlObj.pathname),
@@ -35,7 +35,7 @@ export function getSource(url, context, defaultGetSource) {
 }
 
 export function getFormat(url, context, defaultGetFormat) {
-  if (url.startsWith('custom-nodejs:')) {
+  if (url.startsWith('custom-node:')) {
     return { format: 'module' };
   }
   return defaultGetFormat(url, context, defaultGetFormat);

test/fixtures/es-module-loaders/example-loader.mjs

@@ -11,7 +11,7 @@ baseURL.pathname = process.cwd() + '/';
 export function resolve(specifier, { parentURL = baseURL }, defaultResolve) {
   if (builtinModules.includes(specifier)) {
     return {
-      url: 'nodejs:' + specifier
+      url: 'node:' + specifier
     };
   }
   if (/^\.{1,2}[/]/.test(specifier) !== true && !specifier.startsWith('file:')) {
@@ -27,7 +27,7 @@ export function resolve(specifier, { parentURL = baseURL }, defaultResolve) {
 }
 
 export function getFormat(url, context, defaultGetFormat) {
-  if (url.startsWith('nodejs:') && builtinModules.includes(url.slice(7))) {
+  if (url.startsWith('node:') && builtinModules.includes(url.slice(5))) {
     return {
       format: 'builtin'
     };

test/fixtures/es-module-loaders/loader-unknown-builtin-module.mjs

@@ -1,14 +1,14 @@
 export async function resolve(specifier, { parentURL }, defaultResolve) {
   if (specifier === 'unknown-builtin-module') {
     return {
-      url: 'nodejs:unknown-builtin-module'
+      url: 'node:unknown-builtin-module'
     };
   }
   return defaultResolve(specifier, {parentURL}, defaultResolve);
 }
 
 export async function getFormat(url, context, defaultGetFormat) {
-  if (url === 'nodejs:unknown-builtin-module') {
+  if (url === 'node:unknown-builtin-module') {
     return {
       format: 'builtin'
     };

test/fixtures/es-module-loaders/not-found-assert-loader.mjs

@@ -14,7 +14,7 @@ export async function resolve(specifier, { parentURL }, defaultResolve) {
   catch (e) {
     assert.strictEqual(e.code, 'ERR_MODULE_NOT_FOUND');
     return {
-      url: 'nodejs:fs'
+      url: 'node:fs'
     };
   }
   assert.fail(`Module resolution for ${specifier} should be throw ERR_MODULE_NOT_FOUND`);

test/parallel/test-loaders-unknown-builtin-module.mjs

@@ -2,7 +2,7 @@
 import { expectsError, mustCall } from '../common/index.mjs';
 import assert from 'assert';
 
-const unknownBuiltinModule = 'unknown-builtin-module';
+const unknownBuiltinModule = 'node:unknown-builtin-module';
 
 import(unknownBuiltinModule)
 .then(assert.fail, expectsError({