classifyNativeBinary only checked big-endian Mach-O/Fat magic bytes
(feedfacf, feedface, cafebabe). Real Darwin .node files from node-pty
prebuilds are stored little-endian on disk (cffaedfe = MH_CIGAM_64),
so every Darwin prebuild classified as null, and validateStagedBinaries
threw a platform mismatch on macOS — breaking npm run check for every
macOS contributor. CI didn't catch it because runners are Linux (ELF
path was correct) and tests only planted big-endian fake headers.
Add recognition for all six Mach-O/Fat byte orderings:
- MH_CIGAM (cefaedfe) — LE 32-bit
- MH_CIGAM_64 (cffaedfe) — LE 64-bit [the one real prebuilds use]
- FAT_CIGAM (bebafeca) — LE universal
Update makeFakeNode to write LE CIGAM_64 bytes for the darwin fixture
(matching real on-disk format) and add regression tests for all new
magic forms.
5d691374c3