/**
 * What one selector unit is, once the one settle (`settleUnitLiveness`) has
 * compared the reporter's observation with the marker ledger:
 *
 *   marked? | observation            | state
 *   --------+------------------------+---------------
 *   no      | live === undefined     | Unproven
 *   no      | live                   | Live
 *   no      | !live                  | Dead
 *   yes     | exists === undefined   | Unproven
 *   yes     | !exists                | IntendedEmpty
 *   yes     | exists                 | WentLive
 *
 * A marker never changes the liveness JUDGEMENT, only how it settles.
 */
export declare enum UnitLivenessState {
    /** Contributes — not printed by text surfaces. */
    Live = "live",
    /** Unmarked and matches nothing: `typo, retired target, or a target that does not exist yet`. */
    Dead = "dead",
    /** Marked, and its target does not exist: an explicit, printed acceptance (`acceptedBy: expectEmpty`). */
    IntendedEmpty = "intended-empty",
    /** Marked, and its target now exists: the fence went live — the marker is stale drift. */
    WentLive = "went-live",
    /** A file that could decide it was not read: no claim either way (the read gap vetoes). */
    Unproven = "unproven"
}
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