worker: add no-worker-extension-check option

doc/api/cli.md

@@ -619,6 +619,14 @@ added: v6.0.0
 
 Silence all process warnings (including deprecations).
 
+### `--no-worker-extension-check`
+
+<!-- YAML
+added: REPLACEME
+-->
+
+Disable runtime file extension check for worker.
+
 ### `--node-memory-debug`
 <!-- YAML
 added: v15.0.0

doc/node.1

@@ -280,6 +280,9 @@ These will still be enabled dynamically when `async_hooks` is enabled.
 .It Fl -no-warnings
 Silence all process warnings (including deprecations).
 .
+It Fl -no-worker-extension-check
+Disable runtime file extension check for worker.
+.
 .It Fl -node-memory-debug
 Enable extra debug checks for memory leaks in Node.js internals. This is
 usually only useful for developers debugging Node.js itself.

lib/internal/worker.js

@@ -169,7 +169,10 @@ class Worker extends EventEmitter {
       }
 
       const ext = path.extname(filename);
-      if (ext !== '.js' && ext !== '.mjs' && ext !== '.cjs') {
+      if (!getOptionValue('--no-worker-extension-check') &&
+        ext !== '.js' &&
+        ext !== '.mjs' &&
+        ext !== '.cjs') {
         throw new ERR_WORKER_UNSUPPORTED_EXTENSION(ext);
       }
     }

src/node_options.cc

@@ -590,6 +590,11 @@ EnvironmentOptionsParser::EnvironmentOptionsParser() {
             "set default TLS maximum to TLSv1.3 (default: TLSv1.3)",
             &EnvironmentOptions::tls_max_v1_3,
             kAllowedInEnvironment);
+  AddOption("--worker-extension-check",
+            "disable file extension check for worker thread",
+            &EnvironmentOptions::worker_extension_check,
+            kAllowedInEnvironment,
+            true);
 }
 
 PerIsolateOptionsParser::PerIsolateOptionsParser(

src/node_options.h

@@ -127,6 +127,7 @@ class EnvironmentOptions : public Options {
   bool preserve_symlinks = false;
   bool preserve_symlinks_main = false;
   bool prof_process = false;
+  bool worker_extension_check = true;
 #if HAVE_INSPECTOR
   std::string cpu_prof_dir;
   static const uint64_t kDefaultCpuProfInterval = 1000;

test/parallel/test-worker-disable-extension-check.js

@@ -0,0 +1,9 @@
+// Flags: --no-worker-extension-check
+
+'use strict';
+const common = require('../common');
+const fixtures = require('../common/fixtures');
+
+const { Worker } = require('worker_threads');
+
+(common.mustCall(() => { new Worker(fixtures.path('foo')); }))();