chakra-core/ChakraCore

ChakraCore is an open source Javascript engine with a C API.

Stars: 9.3k
Forks: 1.2k
Open beginner issues: 0
Indexed issues: 582

Dominant language: JavaScript
License: MIT
Last GitHub push: Feb 19, 2026
Latest indexed: Sep 15, 2026
Contributing guide: Contributing guide
Code of conduct: No code of conduct
Beginner labels: help wanted good first issue
PR merge metrics: No merged PRs in 30d

Open All

582 open issues indexed

instanceof returns incorrect result within function after prototype chain has been extended with Object.setPrototypeOf() Open

Bug ES Spec Conformance help wanted

chakra-core/ChakraCore#5915 · 6 comments · 0 reactions · 1 assignee · Indexed Sep 14, 2026
ChakraCore crashes due to null dereference Open

chakra-core/ChakraCore#5941 · 1 comment · 0 reactions · 1 assignee · Indexed Sep 14, 2026
Assertion Failure at bin/ch/Debugger.cpp:412 Open

Bug

chakra-core/ChakraCore#5943 · 1 comment · 0 reactions · 1 assignee · Indexed Sep 14, 2026
Assertion failure at lib/Backend/NativeCodeGenerator.cpp:957 Open

Bug Severity: 2

chakra-core/ChakraCore#5955 · 0 comments · 0 reactions · 1 assignee · Indexed Sep 14, 2026
Number.prototype.toFixed() against big numbers doesn't have enough precision. Open

Bug Severity: 2

chakra-core/ChakraCore#5959 · 1 comment · 0 reactions · 1 assignee · Indexed Sep 14, 2026
Number.prototype.toFixed() sometimes rounds to non-closest value Open

Bug Severity: 2

chakra-core/ChakraCore#5960 · 1 comment · 0 reactions · 1 assignee · Indexed Sep 14, 2026
ASSERTION (scopeSlotCount != 0) failed in Js::InterpreterStackFrame::NewScopeSlots Open

chakra-core/ChakraCore#5997 · 1 comment · 0 reactions · 1 assignee · Indexed Sep 14, 2026
ASSERTION (!frameObject || VarIsCorrectType(frameObject) failed in Js::HeapArgumentsObject::HeapArgumentsObject Open

chakra-core/ChakraCore#5998 · 0 comments · 0 reactions · 1 assignee · Indexed Sep 14, 2026
ASSERTION (this->threadContext->GetRecordedException() == nullptr || GetThreadContext()->HasUnhandledException()) failed in Js::ScriptContext::RecordException Open

chakra-core/ChakraCore#6007 · 0 comments · 0 reactions · 1 assignee · Indexed Sep 14, 2026
ASSERTION (skipAssert || value == nullptr || *value == property) failed in Js::JavascriptOperators::GetProperty_Internal Open

Bug

chakra-core/ChakraCore#6010 · 1 comment · 0 reactions · 1 assignee · Indexed Sep 14, 2026
ASSERTION (!VarIs<RecyclableObject>(instance) ? 1 : ((RecyclableObject*)instance)->GetScriptContext()->GetLibrary() == library) failed in Js::JavascriptOperators::IsUndefinedObject Open

chakra-core/ChakraCore#6015 · 2 comments · 0 reactions · 1 assignee · Indexed Sep 14, 2026
Assertion failure at lib/Runtime/Language/InterpreterLoop.inl:383 Open

Bug Severity: 3

chakra-core/ChakraCore#6020 · 0 comments · 0 reactions · 0 assignees · Indexed Sep 14, 2026
Assertion failure at lib/Runtime/Base/FunctionBody.h:2969 Open

Bug Severity: 3

chakra-core/ChakraCore#6023 · 0 comments · 0 reactions · 0 assignees · Indexed Sep 14, 2026
Assertion failure at lib/Runtime/Language/InlineCache.cpp:571 Open

chakra-core/ChakraCore#6025 · 0 comments · 0 reactions · 1 assignee · Indexed Sep 14, 2026
Assertion failure at lib/Runtime/Language/DynamicProfileInfo.cpp:1255 Open

chakra-core/ChakraCore#6026 · 0 comments · 0 reactions · 1 assignee · Indexed Sep 14, 2026
Microsoft Edge 18 Intl.NumberFormat formats currency with more than 2 digits incorrectly Open

Compatibility Intl

chakra-core/ChakraCore#6029 · 1 comment · 3 reactions · 0 assignees · Indexed Sep 14, 2026
Assertion failure at lib/Runtime/Library/JavascriptArray.cpp:5766 Open

chakra-core/ChakraCore#6031 · 0 comments · 0 reactions · 1 assignee · Indexed Sep 14, 2026
ASSERTION (lifetime->start < instr->GetNumber() && lifetime->end >= instr->GetNumber()) failed in LinearScan::SpillInlineeArgs(IR::Instr*)::$_3::operator Open

Bug Severity: 2

chakra-core/ChakraCore#6033 · 1 comment · 0 reactions · 0 assignees · Indexed Sep 14, 2026
ASSERTION (!CrossSite::NeedMarshalVar(value, GetScriptContext())) failed in Js::InterpreterStackFrame::ValidateRegValue Open

Bug

chakra-core/ChakraCore#6038 · 0 comments · 0 reactions · 0 assignees · Indexed Sep 14, 2026
Assertion failure at lib/Runtime/Library/IntlEngineInterfaceExtensionObject.cpp:3146 Open

Bug Severity: 2

chakra-core/ChakraCore#6039 · 0 comments · 0 reactions · 0 assignees · Indexed Sep 14, 2026
Assertion failure at lib/Backend/LinearScan.cpp:2031 Open

chakra-core/ChakraCore#6049 · 1 comment · 0 reactions · 1 assignee · Indexed Sep 14, 2026
stack overflow Open

Bug Severity: 3

chakra-core/ChakraCore#6053 · 0 comments · 0 reactions · 1 assignee · Indexed Sep 14, 2026
Assertion failure at lib/Backend/BackwardPass.cpp:8667 Open

Bug Severity: 2

chakra-core/ChakraCore#6055 · 0 comments · 0 reactions · 0 assignees · Indexed Sep 14, 2026
Number format: 1.4e-3 .toExponential(1) returns "1.3e-3" Open

chakra-core/ChakraCore#6095 · 0 comments · 1 reaction · 1 assignee · Indexed Sep 14, 2026
ASSERTION FAILURE at RecyclerObjectGraphDumper.cpp, line 45 with gc Open

Bug Severity: 3

chakra-core/ChakraCore#6100 · 1 comment · 0 reactions · 1 assignee · Indexed Sep 14, 2026
Implement class fields Stage 3 proposal Open

ECMAScript Spec Feature Request

chakra-core/ChakraCore#6136 · 4 comments · 1 reaction · 0 assignees · Indexed Sep 14, 2026
Calling JsStopDebugging() hits failfast in DebugContext.cpp Open

Debugger

chakra-core/ChakraCore#6160 · 0 comments · 0 reactions · 1 assignee · Indexed Sep 14, 2026
Wrong Realization of String.prototype.toLocaleLowerCase Open

Bug Severity: 2

chakra-core/ChakraCore#6173 · 0 comments · 0 reactions · 0 assignees · Indexed Sep 14, 2026
Assertion Error (ByteCode Updward Exposed Used Mismatch) Open

Bug Severity: 2

chakra-core/ChakraCore#6181 · 1 comment · 0 reactions · 1 assignee · Indexed Sep 14, 2026
Assertion Failuer at ChakraCore/lib/Backend/ValueInfo.cpp Open

Bug Severity: 2

chakra-core/ChakraCore#6182 · 0 comments · 0 reactions · 0 assignees · Indexed Sep 14, 2026
Assertion failure at lib/Runtime/Language/InlineCache.h:471 Open

Bug Severity: 2

chakra-core/ChakraCore#6191 · 0 comments · 0 reactions · 0 assignees · Indexed Sep 14, 2026
ASSERTION failure at ChakraCore/lib/Common/Memory/PageAllocator.cpp, line 491 Open

Bug Severity: 3

chakra-core/ChakraCore#6197 · 0 comments · 0 reactions · 1 assignee · Indexed Sep 14, 2026
null pointer dereference in Js::RecyclableObject::GetType Open

chakra-core/ChakraCore#6204 · 0 comments · 0 reactions · 0 assignees · Indexed Sep 14, 2026
ASSERTION Failure at ChakraCore/lib/Jsrt/JsrtInternal.h, line 226 Open

chakra-core/ChakraCore#6212 · 0 comments · 0 reactions · 0 assignees · Indexed Sep 14, 2026
assertion failure in IRBuilder::DoClosureRegCheck Open

chakra-core/ChakraCore#6235 · 0 comments · 0 reactions · 0 assignees · Indexed Sep 14, 2026
assertion failure in Js::IntlEngineInterfaceExtensionObject::EntryIntl_LocaleCompare Open

chakra-core/ChakraCore#6238 · 0 comments · 0 reactions · 0 assignees · Indexed Sep 14, 2026
"Illegal instruction " at ChakraCore/lib/Common/CommonPal.h:160 Open

chakra-core/ChakraCore#6248 · 0 comments · 0 reactions · 0 assignees · Indexed Sep 14, 2026
memory leak from ChakraCore/lib/Common/Memory/HeapAllocator.cpp Open

chakra-core/ChakraCore#6249 · 0 comments · 0 reactions · 0 assignees · Indexed Sep 14, 2026
Ubsan errors Open

chakra-core/ChakraCore#6250 · 1 comment · 0 reactions · 0 assignees · Indexed Sep 14, 2026
crash due to invalid memory access at ChakraCore/lib/Common/Memory/PageAllocator.h:731 Open

chakra-core/ChakraCore#6263 · 0 comments · 0 reactions · 0 assignees · Indexed Sep 14, 2026
ASSERTION failure in ChakraCore/lib/Runtime/Language/CacheOperator.inl, line 367 Open

chakra-core/ChakraCore#6268 · 0 comments · 0 reactions · 0 assignees · Indexed Sep 14, 2026
ASSERTION failure in ChakraCore/lib/Runtime/Language/InlineCache.inl, line 244 Open

chakra-core/ChakraCore#6269 · 0 comments · 0 reactions · 0 assignees · Indexed Sep 14, 2026
ASSERTION failure in ChakraCore/lib/Runtime/Types/PathTypeHandler.cpp, line 3830 Open

chakra-core/ChakraCore#6270 · 0 comments · 0 reactions · 0 assignees · Indexed Sep 14, 2026
ASSERTION failure in ChakraCore/lib/Runtime/Language/CacheOperators.cpp, line 178 Open

chakra-core/ChakraCore#6271 · 1 comment · 0 reactions · 1 assignee · Indexed Sep 14, 2026
Crash due to buffer overrun in Inline::BuildIRForInlinee Open

chakra-core/ChakraCore#6274 · 0 comments · 0 reactions · 0 assignees · Indexed Sep 14, 2026
Crash due to buffer overrun in UnifiedRegex::RuntimeCharTrie::CloneFrom Open

chakra-core/ChakraCore#6275 · 0 comments · 0 reactions · 0 assignees · Indexed Sep 14, 2026
Crash due to memory corruption in Js::JavascriptNativeIntArray::ValidateArray Open

chakra-core/ChakraCore#6276 · 0 comments · 0 reactions · 0 assignees · Indexed Sep 14, 2026
Should we throw an early error for function calls on LHS in strict mode? Open

chakra-core/ChakraCore#6283 · 4 comments · 0 reactions · 0 assignees · Indexed Sep 14, 2026
Refactor module code to keep dependency specifiers in source code order Open

Codebase Quality

chakra-core/ChakraCore#6296 · 1 comment · 0 reactions · 0 assignees · Indexed Sep 14, 2026
Implement String.prototype.replaceAll Open

ECMAScript Spec Feature Request

chakra-core/ChakraCore#6297 · 6 comments · 2 reactions · 0 assignees · Indexed Sep 14, 2026

A short digest of beginner-friendly GitHub issues.