bootstrap: support namespaced builtins in snapshot scripts

lib/internal/main/mksnapshot.js

@@ -7,6 +7,8 @@ const {
   ObjectSetPrototypeOf,
   SafeArrayIterator,
   SafeSet,
+  StringPrototypeStartsWith,
+  StringPrototypeSlice,
 } = primordials;
 
 const binding = internalBinding('mksnapshot');
@@ -96,23 +98,29 @@ function supportedInUserSnapshot(id) {
 }
 
 function requireForUserSnapshot(id) {
-  if (!BuiltinModule.canBeRequiredByUsers(id)) {
+  let normalizedId = id;
+  if (StringPrototypeStartsWith(id, 'node:')) {
+    normalizedId = StringPrototypeSlice(id, 5);
+  }
+  if (!BuiltinModule.canBeRequiredByUsers(normalizedId) ||
+      (id !== normalizedId &&
+        !BuiltinModule.canBeRequiredWithoutScheme(normalizedId))) {
     // eslint-disable-next-line no-restricted-syntax
     const err = new Error(
       `Cannot find module '${id}'. `,
     );
     err.code = 'MODULE_NOT_FOUND';
     throw err;
   }
-  if (!supportedInUserSnapshot(id)) {
-    if (!warnedModules.has(id)) {
+  if (!supportedInUserSnapshot(normalizedId)) {
+    if (!warnedModules.has(normalizedId)) {
       process.emitWarning(
         `built-in module ${id} is not yet supported in user snapshots`);
-      warnedModules.add(id);
+      warnedModules.add(normalizedId);
     }
   }
 
-  return require(id);
+  return require(normalizedId);
 }
 
 function main() {

test/parallel/test-snapshot-namespaced-builtin.js

@@ -0,0 +1,42 @@
+'use strict';
+
+// This tests snapshot JS API using the example in the docs.
+
+require('../common');
+const assert = require('assert');
+const { spawnSync } = require('child_process');
+const tmpdir = require('../common/tmpdir');
+const path = require('path');
+const fs = require('fs');
+
+tmpdir.refresh();
+const blobPath = path.join(tmpdir.path, 'snapshot.blob');
+{
+  // The list of modules supported in the snapshot is unstable, so just check
+  // a few that are known to work.
+  const code = `
+    require("node:v8");
+    require("node:fs");
+    require("node:fs/promises");
+  `;
+  fs.writeFileSync(
+    path.join(tmpdir.path, 'entry.js'),
+    code,
+    'utf8'
+  );
+  const child = spawnSync(process.execPath, [
+    '--snapshot-blob',
+    blobPath,
+    '--build-snapshot',
+    'entry.js',
+  ], {
+    cwd: tmpdir.path
+  });
+  if (child.status !== 0) {
+    console.log(child.stderr.toString());
+    console.log(child.stdout.toString());
+    assert.strictEqual(child.status, 0);
+  }
+  const stats = fs.statSync(path.join(tmpdir.path, 'snapshot.blob'));
+  assert(stats.isFile());
+}