import type { StoryContext } from './types';
/**
 * Get snapshot directory
 */
export declare function getSnapshotDir(ctx: StoryContext): string;
/**
 * Load snapshot versions
 */
export declare function loadSnapshotVersions(ctx: StoryContext, storyId: string): Promise<VersionedSnapshot | null>;
/**
 * Save snapshot version
 */
export declare function saveSnapshotVersion(ctx: StoryContext, storyId: string, description?: string): Promise<SnapshotVersion>;
/**
 * Restore snapshot to a previous version
 */
export declare function restoreSnapshotVersion(ctx: StoryContext, storyId: string, version: number): Promise<boolean>;
/**
 * Generate diff between two HTML snapshots
 * Returns a simple text-based diff (for actual image diff, you'd need canvas/image processing)
 */
export declare function generateTextDiff(oldHtml: string, newHtml: string): DiffResult;
/**
 * Generate visual diff HTML
 */
export declare function generateDiffHTML(oldHtml: string, newHtml: string): string;
/**
 * Get diff styles
 */
export declare function getDiffStyles(): string;
/**
 * List all snapshot versions for a story
 */
export declare function listSnapshotVersions(ctx: StoryContext, storyId: string): Promise<SnapshotVersion[]>;
/**
 * Delete old snapshot versions
 */
export declare function pruneSnapshotVersions(ctx: StoryContext, storyId: string, keepCount?: number): Promise<number>;
/**
 * Snapshot version info
 */
export declare interface SnapshotVersion {
  version: number
  timestamp: number
  commit?: string
  description?: string
}
/**
 * Snapshot with version history
 */
export declare interface VersionedSnapshot {
  current: SnapshotVersion
  history: SnapshotVersion[]
  maxVersions: number
}
/**
 * Diff result
 */
export declare interface DiffResult {
  hasDiff: boolean
  percentage: number
  diffImagePath?: string
  changedPixels: number
  totalPixels: number
}
