Importing cjs file with "module.exports" export causes fatal error

[dsherret]

Version

23.9.0

Platform

Microsoft Windows NT 10.0.26100.0 x64

Subsystem

No response

What steps will reproduce the bug?

// a.mjs
import * as test from "./b.cjs";

console.log(test);

// b.cjs
module.exports["module.exports"] = 6;

Then node a.mjs

How often does it reproduce? Is there a required condition?

Every time.

What is the expected behavior? Why is that the expected behavior?

Probably:

> node a.mjs
[Module: null prototype] {
  default: { 'module.exports': 6 },
  'module.exports': { 'module.exports': 6 }
}

What do you see instead?

> node a.mjs


#
# Fatal error in , line 0
# Check failed: IsTheHole(exports->Lookup(name), isolate).
#
#
#
#FailureMessage Object: 00000026F33FE980
----- Native stack trace -----

 1: 00007FF73ED9FB1D node::SetCppgcReference+16781
 2: 00007FF73EC7CA1F node::TriggerNodeReport+74543
 3: 00007FF740005231 V8_Fatal+225
 4: 00007FF73F5C5201 v8::MemorySpan<std::basic_string_view<char,std::char_traits<char> > const >::end+4401
 5: 00007FF73F5D7CCC v8::MemorySpan<std::basic_string_view<char,std::char_traits<char> > const >::end+80892
 6: 00007FF73F607EDE v8::RegExp::GetFlags+166382
 7: 00007FF73F9F8698 v8::Module::InstantiateModule+136
 8: 00007FF73ED52C4C v8::base::CPU::has_bmi2+16684
 9: 00007FF73FA1FD6A v8::PropertyDescriptor::writable+79722
10: 00007FF73FA1DF02 v8::PropertyDescriptor::writable+71938
11: 00007FF73FA5F25B v8::PropertyDescriptor::writable+339035
12: 00007FF73FB41219 v8::PropertyDescriptor::writable+1264665
13: 00007FF73FA4DDD3 v8::PropertyDescriptor::writable+268243
14: 00007FF73FA1B953 v8::PropertyDescriptor::writable+62291
15: 00007FF73F8B955A v8::Isolate::NumberOfHeapSpaces+2634
16: 00007FF73F8B964B v8::Isolate::NumberOfHeapSpaces+2875
17: 00007FF73F8BA384 v8::Isolate::NumberOfHeapSpaces+6260
18: 00007FF73F88E257 v8::base::CPU::has_sse41+1671
19: 00007FF73F88DEC0 v8::base::CPU::has_sse41+752
20: 00007FF73EDE4F32 node::CallbackScope::~CallbackScope+530
21: 00007FF73EDE4DAE node::CallbackScope::~CallbackScope+142
22: 00007FF73ECE2946 v8::base::CPU::has_fpu+49734
23: 00007FF73ECFD045 EVP_MD_meth_get_input_blocksize+58213
24: 00007FF73EE1879A uv_timer_stop+1322
25: 00007FF73EE1493B uv_update_time+475
26: 00007FF73EE144A4 uv_run+884
27: 00007FF73EDE4525 node::SpinEventLoop+405
28: 00007FF73ECAD95A v8_inspector::protocol::Binary::operator=+130346
29: 00007FF73ED4E82C node::Start+4796
30: 00007FF73ED4D597 node::Start+39
31: 00007FF73EABF3ED AES_cbc_encrypt+158237
32: 00007FF740725174 inflateValidate+29428
33: 00007FFFF58EE8D7 BaseThreadInitThunk+23
34: 00007FFFF70FBF2C RtlUserThreadStart+44

Additional information

No response

[dsherret]

I think the fix is to add a || exportName === "module.exports" here:

node/lib/internal/modules/esm/translators.js

Line 215 in 47a59bd

if (!ObjectPrototypeHasOwnProperty(exports, exportName) || exportName === 'default') {

[aduh95]

Would you like to send a PR?

[dsherret]

I would, but I don't want to go through with setting up my development environment.

[joyeecheung]

cc @guybedford

[guybedford]

I'd be happy to post up a PR on Friday, unless someone else wants to get to it first.

[guybedford]

Fix available at #57366.