/**
 * {@link EMPTY_RULE_ADVICE} plus the failOnEmpty advice that APPLIES to this
 * rule — never "set failOnEmpty: true" to a rule that already fails on empty:
 *
 *   - a soft skip (exit 2): … — or set `failOnEmpty: true` once the rule is known to have real subjects;
 *   - a failing skip (exit 1): … — or, if the set may legitimately be empty, set `failOnEmpty: false`.
 *
 * Pass the settled emptiness (`ISettledRuleEmptiness`) or `{ fails }`.
 */
export declare function formatEmptyRuleAdvice(emptiness: {
    readonly fails: boolean;
}): string;
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