/**
 * Per-rule change extraction.
 *
 * The report says a rule fired four times and saved nineteen tokens. That is
 * enough to trust the `safe` level and nowhere near enough to review the
 * `aggressive` one, where the honest advice has always been "read the diff" —
 * and the diff was one undifferentiated block for every rule at once.
 *
 * This turns each rule into its own short list of "this became that", so an
 * aggressive run can be judged rule by rule and a single bad rule disabled
 * with `--disable`, instead of the whole level.
 */
export interface RuleChange {
    /** The text the rule removed or replaced. */
    before: string;
    /** What it became. Empty when the text was simply deleted. */
    after: string;
}
/** Changes reported per rule. The hit count carries the true total. */
export declare const DEFAULT_CHANGE_LIMIT = 5;
/**
 * Extracts what a rule changed, as a short list of before/after pairs.
 *
 * Returns an empty list rather than a partial one when the change is too large
 * to summarise usefully — an empty list reads as "nothing to show here", which
 * is honest, where a truncated one would read as "this is all that happened".
 */
export declare function extractChanges(before: string, after: string, limit?: number): RuleChange[];
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