util: fix parseArgs skipping positional arg with --eval and --print

azadgupta1 · aduh95 · commit bb6e680eb17f · 2026-01-19T19:19:21.000+01:00
PR-URL: #60814 Reviewed-By: René <contact.9a5d6388@renegade334.me.uk> Reviewed-By: Ilyas Shabi <ilyasshabi94@gmail.com>
diff --git a/lib/internal/util/parse_args/parse_args.js b/lib/internal/util/parse_args/parse_args.js
@@ -2,7 +2,6 @@
 
 const {
   ArrayPrototypeForEach,
-  ArrayPrototypeIncludes,
   ArrayPrototypeMap,
   ArrayPrototypePush,
   ArrayPrototypePushApply,
@@ -54,20 +53,16 @@ const {
   kEmptyObject,
 } = require('internal/util');
 
+const { getOptionValue } = require('internal/options');
 
 function getMainArgs() {
-  // Work out where to slice process.argv for user supplied arguments.
-
-  // Check node options for scenarios where user CLI args follow executable.
-  const execArgv = process.execArgv;
-  if (ArrayPrototypeIncludes(execArgv, '-e') ||
-      ArrayPrototypeIncludes(execArgv, '--eval') ||
-      ArrayPrototypeIncludes(execArgv, '-p') ||
-      ArrayPrototypeIncludes(execArgv, '--print')) {
+  // -p / --print internally sets --eval, so this works for all cases
+  const evalValue = getOptionValue('--eval');
+
+  if (evalValue.length !== 0) {
     return ArrayPrototypeSlice(process.argv, 1);
   }
 
-  // Normally first two arguments are executable and script, then CLI arguments
   return ArrayPrototypeSlice(process.argv, 2);
 }
 
diff --git a/test/parallel/test-parse-args.mjs b/test/parallel/test-parse-args.mjs
@@ -1,6 +1,6 @@
-import '../common/index.mjs';
+import { spawnPromisified } from '../common/index.mjs';
 import assert from 'node:assert';
-import { test } from 'node:test';
+import { suite, test } from 'node:test';
 import { parseArgs } from 'node:util';
 
 test('when short option used as flag then stored as flag', () => {
@@ -211,73 +211,48 @@ test('order of option and positional does not matter (per README)', () => {
   );
 });
 
-test('correct default args when use node -p', () => {
-  const holdArgv = process.argv;
-  process.argv = [process.argv0, '--foo'];
-  const holdExecArgv = process.execArgv;
-  process.execArgv = ['-p', '0'];
-  const result = parseArgs({ strict: false });
-
-  const expected = { values: { __proto__: null, foo: true },
-                     positionals: [] };
-  assert.deepStrictEqual(result, expected);
-  process.argv = holdArgv;
-  process.execArgv = holdExecArgv;
-});
-
-test('correct default args when use node --print', () => {
-  const holdArgv = process.argv;
-  process.argv = [process.argv0, '--foo'];
-  const holdExecArgv = process.execArgv;
-  process.execArgv = ['--print', '0'];
-  const result = parseArgs({ strict: false });
-
-  const expected = { values: { __proto__: null, foo: true },
-                     positionals: [] };
-  assert.deepStrictEqual(result, expected);
-  process.argv = holdArgv;
-  process.execArgv = holdExecArgv;
-});
-
-test('correct default args when use node -e', () => {
-  const holdArgv = process.argv;
-  process.argv = [process.argv0, '--foo'];
-  const holdExecArgv = process.execArgv;
-  process.execArgv = ['-e', '0'];
-  const result = parseArgs({ strict: false });
-
-  const expected = { values: { __proto__: null, foo: true },
-                     positionals: [] };
-  assert.deepStrictEqual(result, expected);
-  process.argv = holdArgv;
-  process.execArgv = holdExecArgv;
-});
-
-test('correct default args when use node --eval', () => {
-  const holdArgv = process.argv;
-  process.argv = [process.argv0, '--foo'];
-  const holdExecArgv = process.execArgv;
-  process.execArgv = ['--eval', '0'];
-  const result = parseArgs({ strict: false });
-  const expected = { values: { __proto__: null, foo: true },
-                     positionals: [] };
-  assert.deepStrictEqual(result, expected);
-  process.argv = holdArgv;
-  process.execArgv = holdExecArgv;
-});
-
-test('correct default args when normal arguments', () => {
-  const holdArgv = process.argv;
-  process.argv = [process.argv0, 'script.js', '--foo'];
-  const holdExecArgv = process.execArgv;
-  process.execArgv = [];
-  const result = parseArgs({ strict: false });
+suite('correct default args', () => {
+  suite('with CLI flags', () => {
+    const evalCode = "JSON.stringify(require('util').parseArgs({ strict: false }).values)";
+    const evalCodePrinted = `process.stdout.write(${evalCode})`;
+    const execArgsTests = {
+      '-e <script>': ['-e', evalCodePrinted],
+      '-p <script>': ['-p', evalCode],
+      '-pe <script>': ['-pe', evalCode],
+      '--eval <script>': ['--eval', evalCodePrinted],
+      '--eval=<script>': [`--eval=${evalCodePrinted}`],
+      '--print <script>': ['--print', evalCode],
+      '--print --eval <script>': ['--print', '--eval', evalCode],
+      '--print --eval=<script>': ['--print', `--eval=${evalCode}`],
+    };
+    for (const description in execArgsTests) {
+      const execArgs = execArgsTests[description];
+      test(description, async () => {
+        const { code, signal, stderr, stdout } = await spawnPromisified(
+          process.execPath,
+          [...execArgs, '--', '--foo', '--bar']);
+        assert.deepStrictEqual({
+          code,
+          signal,
+          stderr,
+          stdout: JSON.parse(stdout),
+        }, {
+          code: 0,
+          signal: null,
+          stderr: '',
+          stdout: { foo: true, bar: true },
+        });
+      });
+    }
+  });
 
-  const expected = { values: { __proto__: null, foo: true },
-                     positionals: [] };
-  assert.deepStrictEqual(result, expected);
-  process.argv = holdArgv;
-  process.execArgv = holdExecArgv;
+  test('without CLI flags', () => {
+    const holdArgv = process.argv;
+    process.argv = [process.argv0, 'script.js', '--foo', '--bar'];
+    const { values } = parseArgs({ strict: false });
+    assert.deepStrictEqual(values, { __proto__: null, foo: true, bar: true });
+    process.argv = holdArgv;
+  });
 });
 
 test('excess leading dashes on options are retained', () => {
@@ -1052,13 +1027,10 @@ test('allow negative options and passed multiple arguments', () => {
 test('auto-detect --no-foo as negated when strict:false and allowNegative', () => {
   const holdArgv = process.argv;
   process.argv = [process.argv0, 'script.js', '--no-foo'];
-  const holdExecArgv = process.execArgv;
-  process.execArgv = [];
   const result = parseArgs({ strict: false, allowNegative: true });
 
   const expected = { values: { __proto__: null, foo: false },
                      positionals: [] };
   assert.deepStrictEqual(result, expected);
   process.argv = holdArgv;
-  process.execArgv = holdExecArgv;
 });
