lib,doc: make process.moduleLoadList immutable and document it

process.moduleLoadList was added in the early days but never documented
and exposed as mutable array. This is a breaking change for code that
used this undocumented array as a mutable array.

Fixes: #41233

Author: Xstoudi

doc/api/process.md

@@ -2858,6 +2858,35 @@ console.log(memoryUsage.rss());
 // 35655680
 ```
 
+## `process.moduleLoadList`
+
+<!-- YAML
+added: v0.5.3
+changes:
+  - version: REPLACEME
+    pr-url: REPLACEME
+    description: Make `moduleLoadList` immutable.
+-->
+
+* Returns: {string\[]}
+
+The `process.moduleLoadList` property returns an array of internal bindings and core modules that
+were loaded during the current Node.js process execution.
+
+```mjs
+import { moduleLoadList } from 'node:process';
+
+console.log(moduleLoadList);
+// ['Internal Binding builtins', 'Internal Binding module_wrap', 'Internal Binding errors', ...]
+```
+
+```cjs
+const { moduleLoadList } = require('node:process');
+
+console.log(moduleLoadList);
+// ['Internal Binding builtins', 'Internal Binding module_wrap', 'Internal Binding errors', ...]
+```
+
 ## `process.nextTick(callback[, ...args])`
 
 <!-- YAML

lib/internal/bootstrap/realm.js

@@ -58,6 +58,7 @@ const {
   ArrayPrototypeSlice,
   Error,
   ObjectDefineProperty,
+  ObjectFreeze,
   ObjectKeys,
   ObjectPrototypeHasOwnProperty,
   ObjectSetPrototypeOf,
@@ -74,10 +75,9 @@ const {
 const moduleLoadList = [];
 ObjectDefineProperty(process, 'moduleLoadList', {
   __proto__: null,
-  value: moduleLoadList,
-  configurable: true,
+  get() { return ObjectFreeze(moduleLoadList.slice()); },
+  configurable: false,
   enumerable: true,
-  writable: false,
 });
 
 

test/parallel/test-process-moduleloadlist.js

@@ -0,0 +1,8 @@
+'use strict';
+
+require('../common');
+const assert = require('assert');
+
+assert.ok(Array.isArray(process.moduleLoadList));
+assert.throws(() => process.moduleLoadList.push('foo'), /^TypeError: Cannot add property \d+, object is not extensible$/);
+assert.throws(() => process.moduleLoadList = 'foo', /^TypeError: Cannot set property moduleLoadList of #<process> which has only a getter$/);