util: add getCwdSafe internal util fn

This function was first implemented in nodejs#46826, but at some point
of the PR implementation this fn was no longer related to the PR.

Refs: nodejs#46826 (comment)

Author: jlenon7

lib/internal/modules/esm/utils.js

@@ -22,6 +22,7 @@ const {
   initializeFrozenIntrinsics,
 } = require('internal/process/pre_execution');
 const { pathToFileURL } = require('internal/url');
+const { getCwdSafe } = require('internal/util');
 const {
   setImportModuleDynamicallyCallback,
   setInitializeImportMetaObjectCallback,
@@ -195,15 +196,6 @@ function isLoaderWorker() {
 async function initializeHooks() {
   const customLoaderURLs = getOptionValue('--experimental-loader');
 
-  let cwd;
-  try {
-    // `process.cwd()` can fail if the parent directory is deleted while the process runs.
-    cwd = process.cwd() + '/';
-  } catch {
-    cwd = '/';
-  }
-
-
   const { Hooks } = require('internal/modules/esm/hooks');
   const esmLoader = require('internal/process/esm_loader').esmLoader;
 
@@ -220,7 +212,7 @@ async function initializeHooks() {
   loadPreloadModules();
   initializeFrozenIntrinsics();
 
-  const parentURL = pathToFileURL(cwd).href;
+  const parentURL = pathToFileURL(getCwdSafe()).href;
   for (let i = 0; i < customLoaderURLs.length; i++) {
     await hooks.register(
       customLoaderURLs[i],

lib/internal/process/esm_loader.js

@@ -10,7 +10,7 @@ const {
   hasUncaughtExceptionCaptureCallback,
 } = require('internal/process/execution');
 const { pathToFileURL } = require('internal/url');
-const { kEmptyObject } = require('internal/util');
+const { kEmptyObject, getCwdSafe } = require('internal/util');
 
 let esmLoader;
 
@@ -23,14 +23,7 @@ module.exports = {
     try {
       const userImports = getOptionValue('--import');
       if (userImports.length > 0) {
-        let cwd;
-        try {
-          // `process.cwd()` can fail if the parent directory is deleted while the process runs.
-          cwd = process.cwd() + '/';
-        } catch {
-          cwd = '/';
-        }
-        const parentURL = pathToFileURL(cwd).href;
+        const parentURL = pathToFileURL(getCwdSafe()).href;
         await SafePromiseAllReturnVoid(userImports, (specifier) => esmLoader.import(
           specifier,
           parentURL,

lib/internal/util.js

@@ -358,6 +358,24 @@ function getConstructorOf(obj) {
   return null;
 }
 
+/**
+ * Get the current working directory while accounting for the possibility that it has been deleted.
+ * `process.cwd()` can fail if the parent directory is deleted while the process runs.
+ * @returns {string} The current working directory or the volume root if it cannot be determined.
+ */
+function getCwdSafe() {
+  const { sep } = require('path');
+  let cwd = '';
+
+  try {
+    cwd = process.cwd();
+  } catch {
+    /**/
+  }
+
+  return cwd + sep;
+}
+
 function getSystemErrorName(err) {
   const entry = uvErrmapGet(err);
   return entry ? entry[0] : `Unknown system error ${err}`;
@@ -853,6 +871,7 @@ module.exports = {
   filterDuplicateStrings,
   filterOwnProperties,
   getConstructorOf,
+  getCwdSafe,
   getInternalGlobal,
   getSystemErrorMap,
   getSystemErrorName,