worker: handle --input-type more consistently

PR-URL: #54979
Reviewed-By: Michaël Zasso <targos@protonmail.com>
Reviewed-By: Luigi Pinca <luigipinca@gmail.com>
Reviewed-By: Marco Ippolito <marcoippolito54@gmail.com>

Author: aduh95

lib/internal/main/worker_thread.js

@@ -55,6 +55,7 @@ let debug = require('internal/util/debuglog').debuglog('worker', (fn) => {
 });
 
 const assert = require('internal/assert');
+const { getOptionValue } = require('internal/options');
 const { exitCodes: { kGenericUserError } } = internalBinding('errors');
 
 prepareWorkerThreadExecution();
@@ -152,7 +153,7 @@ port.on('message', (message) => {
         break;
       }
 
-      case 'classic': {
+      case 'classic': if (getOptionValue('--input-type') !== 'module') {
         const { evalScript } = require('internal/process/execution');
         const name = '[worker eval]';
         // This is necessary for CJS module compilation.
@@ -168,6 +169,7 @@ port.on('message', (message) => {
         break;
       }
 
+      // eslint-disable-next-line no-fallthrough
       case 'module': {
         const { evalModuleEntryPoint } = require('internal/process/execution');
         PromisePrototypeThen(evalModuleEntryPoint(filename), undefined, (e) => {

test/parallel/test-worker-cli-options.js

@@ -1,6 +1,6 @@
 // Flags: --expose-internals --expose-gc
 'use strict';
-require('../common');
+const common = require('../common');
 const { Worker } = require('worker_threads');
 const assert = require('assert');
 
@@ -29,3 +29,11 @@ new Worker(CODE, { eval: true, env: process.env, execArgv: ['--expose-internals'
 assert.throws(() => {
   new Worker(CODE, { eval: true, execArgv: ['--expose-gc'] });
 }, /ERR_WORKER_INVALID_EXEC_ARGV/);
+
+// Test ESM eval
+new Worker('export {}', { eval: true, execArgv: ['--input-type=module'] });
+new Worker('export {}', { eval: true, execArgv: ['--input-type=commonjs'] })
+  .once('error', common.expectsError({ name: 'SyntaxError' }));
+new Worker('export {}', { eval: true, execArgv: ['--experimental-detect-module'] });
+new Worker('export {}', { eval: true, execArgv: ['--no-experimental-detect-module'] })
+  .once('error', common.expectsError({ name: 'SyntaxError' }));