/**
 * `.AppImage` packaging — squashfs-compresses a just-assembled AppDir (see
 * bundle.ts's `bundleLinux`) and prepends the AppImage type-2 runtime,
 * producing a single self-mounting, executable file. Re-homed from the
 * pre-v1 `src/appimage.ts` (see PROTECTED.md) with the AppDir-building half
 * removed — bundle.ts now owns that (the resources layout must match the
 * macOS/win32 bundles exactly), leaving this module with just the
 * runtime-download + squashfs + concat mechanics.
 *
 * Host setup: `mksquashfs` must be on PATH.
 *   macOS:           brew install squashfs
 *   Debian/Ubuntu:   apt install squashfs-tools
 *   Fedora:           dnf install squashfs-tools
 */
export type LinuxArch = 'arm64' | 'x64';
/** Whether `mksquashfs` (the `squashfs-tools` package) is on PATH. */
export declare function detectMksquashfs(): boolean;
/**
 * Downloads (or returns the cached copy of) the official AppImage type-2
 * runtime ELF binary for `arch` — what `buildAppImage` prepends to the
 * squashfs filesystem image to produce a self-mounting `.AppImage`. Cached
 * at `~/.murasaki/appimage-runtime/<release>/<arch>/runtime`, a sibling of
 * node-runtime.ts's `~/.murasaki/node/` cache under the same `~/.murasaki`
 * cache root; a second call for the same release/arch returns the cached
 * path immediately with no network access. SHA-256-verified against the
 * pinned checksums above — this is an executable that gets shipped inside
 * every produced `.AppImage`.
 */
export declare function ensureAppImageRuntime(arch: LinuxArch): Promise<string>;
/**
 * Squashfs-compresses `appDir` and prepends the AppImage type-2 runtime (see
 * `ensureAppImageRuntime`) to produce a self-mounting `.AppImage` at
 * `appImagePath`, then chmod +x. Requires `mksquashfs` on PATH — throws an
 * actionable error naming the `squashfs-tools` package rather than silently
 * degrading (e.g. to a plain `.tar.gz`, what the pre-v1 version did): unlike
 * NSIS/WiX (optional installers alongside the always-produced win32 portable
 * folder/zip — see installer.ts), the `.AppImage` is bundle.ts's only Linux
 * packaged deliverable besides the raw AppDir, so silently skipping it would
 * leave `murasaki bundle --target linux-*` with no packaged output at all.
 */
export declare function buildAppImage(appDir: string, appImagePath: string, arch: LinuxArch): Promise<void>;
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