panic: Unhandled case in Node.MemberList: KindVariableDeclarationList on merged namespace/enum element access #64895

🔎 Search Terms

panic Unhandled case Node.MemberList KindVariableDeclarationList merged namespace enum element access

🕗 Version & Regression Information

This changed between versions 6.0.3 and 7.0.2

⏯ Playground Link

No response

💻 Code

namespace Foo { export const BAR = 42; }
enum Foo { BAZ = Foo["BAR"] }

🙁 Actual behavior

tsc panics with:

panic: Unhandled case in Node.MemberList: KindVariableDeclarationList [recovered, repanicked]

The compiler crashes instead of emitting a type error or handling gracefully.

🙂 Expected behavior

tsc should emit a type error (e.g. TS2304 or similar) or
handle the merged namespace/enum case gracefully without crashing.
TypeScript 5.x handles this without panicking.

Additional information about the issue

This is a variant of #64668 (KindModuleBlock panic) but triggered
by export const instead of export class in the namespace.

The fix PR #64746 targets KindModuleBlock it likely does not
cover KindVariableDeclarationList.

Tested on:

• TypeScript 7.0.2 → panics (KindVariableDeclarationList)
• TypeScript 5.8.3 → throws JS TypeError (no panic, no crash)