@adhdev/ghostty-vt-node

Native Node binding for libghostty-vt — exposes a headless ghostty virtual terminal (createTerminal) used by daemon-core's GhosttyVtTerminalBackend.

ABI portability (read this first)

The addon is a pure Node-API (N-API) binding (it exports napi_register_module_v1). N-API is ABI-stable across Node major versions, so a single compiled .node loads on every Node runtime that supports the N-API version it targets — independent of process.versions.modules (NODE_MODULE_VERSION, a.k.a. the "ABI" number: 115 ≈ node20, 127 ≈ node22, 137 ≈ node24).

Practically: you do not need a separate native build per Node version. The per-nodeNNN directory names under prebuilt/ are an addressing convenience, not a hard requirement — the binaries are byte-identical per platform/arch.

Why prebuilts are committed

prebuilt/ is committed to git (only the *-node137 triplet per platform) so that worktree/CI clones load the binding without a build toolchain. A clone with no committed prebuilt would fall through to compiling from source (cmake-js + zig + a libghostty fetch); when that toolchain is absent the loader throws ghostty-vt binding unavailable, which previously surfaced as an environment blocker on node24/ABI137 runners.

Shipped triplets:

prebuilt/darwin-arm64-node137/   # macOS Apple Silicon
prebuilt/linux-x64-node137/      # Linux x64
prebuilt/win32-x64-node137/      # Windows x64

Loader resolution order (index.js)

1. ADHDEV_GHOSTTY_VT_PREBUILT_DIR/<triplet>/ghostty_vt_node.node (explicit override)
2. ADHDEV_GHOSTTY_VT_PREBUILT_DIR/ghostty_vt_node.node
3. build/Release or build/Debug (a local compile)
4. prebuilt/<exact-triplet>/ghostty_vt_node.node
5. N-API fallback — any prebuilt/<platform>-<arch>-node*/ghostty_vt_node.node for the same platform/arch (this is what makes a brand-new ABI such as a future node26 work without shipping a new directory).

If nothing loads, the thrown error names the running triplet and the list of available prebuilt triplets, so an environment-blocker report is precise:

Unable to load @adhdev/ghostty-vt-node native binding for running triplet
"darwin-arm64-node137". Available prebuilt triplets: [darwin-arm64-node137,
linux-x64-node137, win32-x64-node137]. ...

Producing / refreshing a prebuilt

Build on the target platform/arch (cross-builds are not wired here) with the toolchain present (cmake, a C/C++ compiler, and zig for libghostty; set ZIG_EXECUTABLE if zig is not on PATH):

# Build for the running platform-arch and emit it into prebuilt/<triplet>/
ADHDEV_GHOSTTY_VT_EMIT_PREBUILT=1 npm run build -w oss/packages/ghostty-vt-node

# Then keep the node137-named dir (per ABI-portability) and commit it:
#   git add oss/packages/ghostty-vt-node/prebuilt/<platform>-<arch>-node137/

Because the output is ABI-portable, you only need to build once per platform/arch; rename/keep the directory as the node137 triplet and the runtime fallback covers all other Node versions on that platform.

• macOS arm64 and Linux x64 can be produced on the corresponding native runner.
• Windows x64 must be built on a Windows runner (MSVC; see the if(MSVC) block in CMakeLists.txt for the required dynamic-CRT link flags).

Skipping the native build

Set ADHDEV_SKIP_GHOSTTY_VT_BUILD=1 to skip compilation when no prebuilt matches (useful in environments that intentionally run without the terminal backend).