/**
 * Timeline Formatter - Formats nested timeline steps into markdown
 *
 * Renders a hierarchical view where child calls are visually nested inside their parents.
 * By default, uses clause variable names (X, Z, X1) instead of internal Prolog names (_2008).
 * With --debug:internal-vars, shows both: "Z (_2008) = value"
 */
import { TimelineStep } from './timeline.js';
import { DebugFlag } from './cli.js';
export interface TimelineFormatterOptions {
    debugFlags?: Set<DebugFlag>;
    /** When > 1, insert a "Solution N" divider before each solution's first step. */
    solutionCount?: number;
}
/**
 * Format timeline steps into markdown with nested structure
 */
export declare function formatTimeline(steps: TimelineStep[], options?: TimelineFormatterOptions): string;
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