fix(ext/node): process.getBuiltinModule (#26833)

Closes https://github.com/denoland/deno/issues/26832

ext/node/polyfills/01_require.js

@@ -1233,6 +1233,24 @@ function isBuiltin(moduleName) {
     !StringPrototypeStartsWith(moduleName, "internal/");
 }
 
+function getBuiltinModule(id) {
+  if (!isBuiltin(id)) {
+    return undefined;
+  }
+
+  if (StringPrototypeStartsWith(id, "node:")) {
+    // Slice 'node:' prefix
+    id = StringPrototypeSlice(id, 5);
+  }
+
+  const mod = loadNativeModule(id, id);
+  if (mod) {
+    return mod.exports;
+  }
+
+  return undefined;
+}
+
 Module.isBuiltin = isBuiltin;
 
 Module.createRequire = createRequire;
@@ -1327,7 +1345,7 @@ export function register(_specifier, _parentUrl, _options) {
   return undefined;
 }
 
-export { builtinModules, createRequire, isBuiltin, Module };
+export { builtinModules, createRequire, getBuiltinModule, isBuiltin, Module };
 export const _cache = Module._cache;
 export const _extensions = Module._extensions;
 export const _findPath = Module._findPath;

ext/node/polyfills/process.ts

@@ -15,7 +15,7 @@ import {
 
 import { warnNotImplemented } from "ext:deno_node/_utils.ts";
 import { EventEmitter } from "node:events";
-import Module from "node:module";
+import Module, { getBuiltinModule } from "node:module";
 import { report } from "ext:deno_node/internal/process/report.ts";
 import { validateString } from "ext:deno_node/internal/validators.mjs";
 import {
@@ -38,7 +38,15 @@ import {
   versions,
 } from "ext:deno_node/_process/process.ts";
 import { _exiting } from "ext:deno_node/_process/exiting.ts";
-export { _nextTick as nextTick, chdir, cwd, env, version, versions };
+export {
+  _nextTick as nextTick,
+  chdir,
+  cwd,
+  env,
+  getBuiltinModule,
+  version,
+  versions,
+};
 import {
   createWritableStdioStream,
   initStdin,
@@ -728,6 +736,8 @@ Process.prototype.getegid = getegid;
 /** This method is removed on Windows */
 Process.prototype.geteuid = geteuid;
 
+Process.prototype.getBuiltinModule = getBuiltinModule;
+
 // TODO(kt3k): Implement this when we added -e option to node compat mode
 Process.prototype._eval = undefined;
 

tests/unit_node/process_test.ts

@@ -1152,3 +1152,9 @@ Deno.test("process.stdout.columns writable", () => {
   process.stdout.columns = 80;
   assertEquals(process.stdout.columns, 80);
 });
+
+Deno.test("getBuiltinModule", () => {
+  assert(process.getBuiltinModule("fs"));
+  assert(process.getBuiltinModule("node:fs"));
+  assertEquals(process.getBuiltinModule("something"), undefined);
+});