JavaScript heap out of memory during startup on macOS (v1.10.0)

Summary

Running cmd on macOS causes Command Code to consume approximately 4 GB of V8 heap and abort with FATAL ERROR: Reached heap limit Allocation failed - JavaScript heap out of memory about 15 seconds after launch.

This was observed on Command Code 1.10.0. Earlier heap-exhaustion reports such as #522 were closed as fixed in v1, with a request to open a new issue if the problem still occurs on v1.4.0 or later. Unlike those long-session reports, this crash occurs during CLI startup, before normal use.

Expected Behavior

cmd should start the interactive Command Code UI without exhausting the Node.js heap.

Actual Behavior

The process reaches roughly 4.05 GB of live heap, fails repeated Mark-Compact collections, and exits with SIGABRT:

<--- Last few GCs --->

[276:0xca8000000]    15228 ms: Mark-Compact 4046.2 (4143.5) -> 4046.2 (4143.8) MB, pooled: 9 MB, 11.58 / 0.00 ms  (average mu = 0.225, current mu = 0.041) allocation failure; scavenge might not succeed
[276:0xca8000000]    15247 ms: Mark-Compact 4047.2 (4144.7) -> 4047.2 (4144.2) MB, pooled: 9 MB, 18.00 / 0.00 ms  (average mu = 0.122, current mu = 0.034) allocation failure; scavenge might not succeed

<--- JS stacktrace --->

FATAL ERROR: Reached heap limit Allocation failed - JavaScript heap out of memory
----- Native stack trace -----

 1: 0x104456434 node::OOMErrorHandler(char const*, v8::OOMDetails const&) [/Users/<user>/.nvm/versions/node/v22.22.2/bin/node]
 2: 0x104631558 v8::internal::V8::FatalProcessOutOfMemory(v8::internal::Isolate*, char const*, v8::OOMDetails const&) [/Users/<user>/.nvm/versions/node/v22.22.2/bin/node]
 3: 0x104840518 v8::internal::Heap::stack() [/Users/<user>/.nvm/versions/node/v22.22.2/bin/node]
 4: 0x10483e8b8 v8::internal::Heap::CollectGarbage(v8::internal::AllocationSpace, v8::internal::GarbageCollectionReason, v8::GCCallbackFlags) [/Users/<user>/.nvm/versions/node/v22.22.2/bin/node]
 5: 0x104832eac v8::internal::HeapAllocator::AllocateRawWithLightRetrySlowPath(int, v8::internal::AllocationType, v8::internal::AllocationOrigin, v8::internal::AllocationAlignment) [/Users/<user>/.nvm/versions/node/v22.22.2/bin/node]
 6: 0x1048336e4 v8::internal::HeapAllocator::AllocateRawWithRetryOrFailSlowPath(int, v8::internal::AllocationType, v8::internal::AllocationOrigin, v8::internal::AllocationAlignment) [/Users/<user>/.nvm/versions/node/v22.22.2/bin/node]
 7: 0x104807920 v8::internal::FactoryBase<v8::internal::Factory>::NewRawTwoByteString(int, v8::internal::AllocationType) [/Users/<user>/.nvm/versions/node/v22.22.2/bin/node]
 8: 0x10481826c v8::internal::Factory::NewStringFromUtf8(v8::base::Vector<unsigned char const>, unibrow::Utf8Variant, v8::internal::AllocationType) [/Users/<user>/.nvm/versions/node/v22.22.2/bin/node]
 9: 0x10464da4c v8::String::NewFromUtf8(v8::Isolate*, char const*, v8::NewStringType, int) [/Users/<user>/.nvm/versions/node/v22.22.2/bin/node]
10: 0x104576570 node::(anonymous namespace)::MakeString(v8::Isolate*, char const*, unsigned long, node::encoding) [/Users/<user>/.nvm/versions/node/v22.22.2/bin/node]
11: 0x104576474 node::StringDecoder::DecodeData(v8::Isolate*, char const*, unsigned long*) [/Users/<user>/.nvm/versions/node/v22.22.2/bin/node]
12: 0x104576818 node::(anonymous namespace)::DecodeData(v8::FunctionCallbackInfo<v8::Value> const&) [/Users/<user>/.nvm/versions/node/v22.22.2/bin/node]
...
26: 0x10444db4c node::fs::FSReqPromise<node::AliasedBufferBase<double, v8::Float64Array>>::Resolve(v8::Local<v8::Value>) [/Users/<user>/.nvm/versions/node/v22.22.2/bin/node]
27: 0x10445cc94 node::fs::AfterInteger(uv_fs_s*) [/Users/<user>/.nvm/versions/node/v22.22.2/bin/node]
...
36: 0x18499c4e4 start [/usr/lib/dyld]
zsh: abort      cmd

The allocation stack ends in StringDecoder::DecodeData / NewStringFromUtf8, and the asynchronous stack includes node::fs, which may indicate that a large amount of file-backed data is being decoded during startup.

Steps to reproduce the issue

1. Use Node.js v22.22.2 installed through nvm.
2. Install/use global command-code@1.10.0.
3. Run cmd from zsh on macOS.
4. Wait approximately 15 seconds.
5. Observe the process abort with a JavaScript heap out-of-memory error.

Command Code Version

1.10.0

Operating System

macOS

Terminal/IDE

Terminal application not yet identified

Shell

zsh

Additional context

• macOS 26.6 (build 25G72)
• Apple Silicon (arm64)
• Node.js v22.22.2
• npm 10.9.7
• Command Code is installed globally under nvm.
• The failure happens around the default V8 heap ceiling; increasing the heap has not been tested and should not be required for normal startup.
• Related historical report: #522. Its maintainer response says v1 bounded session retention and asks for a new issue for heap OOMs on v1.4.0+.

Beginne damit, cmd mit Node.js v22.22.2 und Command Code 1.10.0 unter macOS zu reproduzieren, und untersuche anschließend die beim Start betroffenen Pfade zum Lesen und Dekodieren von Dateien, auf die die Stack-Frames node::fs und StringDecoder::DecodeData hindeuten. Als erledigt gilt die Aufgabe, wenn die interaktive UI in der gemeldeten Umgebung startet, ohne das V8-Heap-Limit zu erreichen.