import { type ConformanceReport } from './run.js';
import { type DiffXmiReport } from './diff-xmi.js';
import type { BnfCoverageReport } from './bnf.js';
export interface BaselineDifference {
    path: string;
    baseline: number | string;
    current: number | string;
}
export interface BaselineComparison {
    comparable: boolean;
    /** Why not, when `comparable` is false. */
    reason?: string;
    differences: BaselineDifference[];
}
export declare function compareConformanceBaseline(baseline: ConformanceReport, current: ConformanceReport): BaselineComparison;
export declare function compareDiffXmiBaseline(baseline: DiffXmiReport, current: DiffXmiReport): BaselineComparison;
/**
 * Grammar coverage against the normative BNF (B5).
 *
 * Per-production status is compared, not only the totals. Two productions
 * trading places — one implemented, one lost — leaves the total unmoved, and a
 * gate that only watched the total would call that no change.
 */
export declare function compareBnfBaseline(baseline: BnfCoverageReport, current: BnfCoverageReport): BaselineComparison;
export declare function formatBaselineComparison(comparison: BaselineComparison): string;
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