/**
 * VersionTimeline — generic chronological version history timeline.
 *
 * Lane B Phase 5 P5-T7 — DS primitive promoted from the per-case
 * EvalVersionTimeline component in forge-agents. Stateless: accepts
 * a pre-loaded `versions` array and delegates selection / diff
 * rendering to the consumer.
 *
 * Contract (spec R6.1):
 *   props { versions: VersionEntry[], onVersionSelect?, diffAdapter? }
 *
 * Each entry renders: createdAt relative timestamp, source badge,
 * author attribution. Expand-to-diff is deferred to Phase 6 via the
 * optional diffAdapter — if omitted the expand slot renders nothing.
 */
import * as React from 'react';
export interface VersionEntry {
    /** Unique identifier for this version (opaque string). */
    versionId: string;
    /** ISO-8601 timestamp when this version was created. */
    createdAt: string;
    /** Source of the change — drives the source badge. */
    source?: string;
    /** Author name or ID. */
    author?: string;
    /** Optional one-line change summary rendered under the timestamp row. */
    summary?: string;
    /** Raw snapshot — passed to diffAdapter when provided. */
    snapshot?: unknown;
    /** Previous version ID — passed to diffAdapter when provided. */
    prevVersionId?: string | null;
}
export interface DiffInput {
    prev: VersionEntry;
    next: VersionEntry;
}
export interface VersionTimelineProps {
    versions: VersionEntry[];
    /** Called when an entry is selected (toggle — null on deselect). */
    onVersionSelect?: (entry: VersionEntry | null) => void;
    /**
     * When provided, clicking a second entry renders the diff between
     * the two picks using this adapter's output. The adapter receives
     * prev + next VersionEntry objects and should return a React node.
     */
    diffAdapter?: (input: DiffInput) => React.ReactNode;
    className?: string;
}
declare function VersionTimeline({ versions, onVersionSelect, diffAdapter, className }: VersionTimelineProps): import("react/jsx-runtime").JSX.Element;
export { VersionTimeline };