/** Why a rule settled `RuleEmptiness.Stale`. */
export declare enum RuleEmptinessCause {
    /** The primary list matched no file, and not every inclusion unit is intended-empty. */
    NoFiles = "no-files",
    /** Files matched, but 0 ids / tokens / content units came out of them — never assertable. */
    NoUnits = "no-units",
    /** A baselines `expectEmpty` fence whose input selector is dead: the empty output proves nothing. */
    DeadInput = "dead-input"
}
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