The JS eval kernel's LocalModuleLoader linked and evaluated every local
module individually inside the recursive vm.SourceTextModule linker
callback. On any import cycle that re-enters Bun's node:vm linker
mid-instantiation and segfaults JSC (getImportedModule on a null record,
SIGTRAP at 0xFFFFFFFFFFFFFFF8) — e.g. `await import(".../edit/streaming.ts")`,
whose relative-import subtree is cyclic.
Construct the entire local module graph first, then drive a single
link() + evaluate() from the graph root so cyclic graphs instantiate in
one pass. The shared static linker only constructs dependencies;
external (node_modules) modules stay eagerly loaded since they carry no
imports and cannot form a cycle. Failed loads invalidate any
not-fully-evaluated modules so a retry reconstructs them.
Upstream Bun bug: https://github.com/oven-sh/bun/issues/31623
can1357
3f2e4b2fe7