export type ArchiveCodecId = "zstd" | "gzip";
export interface ArchiveCodec {
    id: ArchiveCodecId;
    /** Appended to `home.tar`, so a snapshot names its own codec on disk. */
    extension: string;
    command: string;
    compressArgs: string[];
    decompressArgs: string[];
}
/**
 * zstd is worth a lot on a home full of Markdown, but it is not part of a base
 * macOS or Linux install and on this platform it tends to live in a Homebrew
 * directory that a cron PATH does not carry. gzip is always there, so the codec
 * is resolved per run and recorded in the manifest rather than assumed - restore
 * reads it back instead of guessing from the file name.
 *
 * `tar --zstd` is deliberately not used: that is a GNU tar flag and the bsdtar
 * shipped on macOS does not have it.
 */
export declare function resolveArchiveCodec(isAvailable?: (name: string) => boolean): ArchiveCodec;
/** The codec a manifest recorded, for restoring a snapshot written elsewhere. */
export declare function codecForId(id: ArchiveCodecId): ArchiveCodec;
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