/**
 * Checkpoint Module v3
 *
 * Bulletproof capture of file states before AI edits.
 * This replaces the file watcher approach with a deterministic checkpoint system.
 *
 * Strategy:
 * - Cursor: beforeSubmitPrompt captures modified files, afterFileEdit uses checkpoint
 * - Claude: PreToolUse captures target file, PostToolUse uses checkpoint
 * - OpenCode: tool.execute.before captures target file, tool.execute.after uses checkpoint
 *
 * Storage: .git/agentblame/checkpoints/{conversation_id}.json
 */
export interface FileCheckpoint {
    blobSha: string;
    contentHash: string;
    timestamp: string;
}
export interface Checkpoint {
    conversationId: string;
    timestamp: string;
    files: Record<string, FileCheckpoint>;
}
/**
 * Compute a fast content hash for comparison
 * Uses SHA256 truncated to 16 chars for efficiency
 */
export declare function hashContent(content: string): string;
/**
 * Check if a file has changed since the checkpoint
 * Returns true if the file content differs from the checkpoint
 */
export declare function hasFileChanged(repoRoot: string, conversationId: string, filePath: string): Promise<boolean>;
/**
 * Get checkpoint content for a file (loads from git blob)
 */
export declare function getCheckpointContent(repoRoot: string, conversationId: string, filePath: string): Promise<string | null>;
/**
 * Get the checkpoints directory path
 */
export declare function getCheckpointsDir(repoRoot: string): string;
/**
 * Get the checkpoint file path for a conversation
 */
export declare function getCheckpointPath(repoRoot: string, conversationId: string): string;
/**
 * Ensure checkpoints directory exists
 */
export declare function ensureCheckpointsDir(repoRoot: string): void;
/**
 * Save a checkpoint for a conversation
 */
export declare function saveCheckpoint(repoRoot: string, checkpoint: Checkpoint): void;
/**
 * Load a checkpoint for a conversation
 */
export declare function loadCheckpoint(repoRoot: string, conversationId: string): Checkpoint | null;
/**
 * Update a checkpoint with a new file state
 */
export declare function updateCheckpointFile(repoRoot: string, conversationId: string, filePath: string, blobSha: string, contentHash: string): void;
/**
 * Update checkpoint with content (computes hash and stores blob)
 */
export declare function updateCheckpointWithContent(repoRoot: string, conversationId: string, filePath: string, content: string): Promise<void>;
/**
 * Get the "before" blob for a file from checkpoint
 * Returns null if no checkpoint exists for this file
 */
export declare function getCheckpointBlob(repoRoot: string, conversationId: string, filePath: string): string | null;
/**
 * Delete a checkpoint (cleanup after commit or session end)
 */
export declare function deleteCheckpoint(repoRoot: string, conversationId: string): void;
/**
 * Clean up old checkpoints (older than specified hours)
 */
export declare function cleanupOldCheckpoints(repoRoot: string, maxAgeHours?: number): number;
/**
 * Get list of modified files from git status (staged + unstaged)
 * These are files that may have human edits since last commit
 */
export declare function getGitModifiedFiles(repoRoot: string): Promise<string[]>;
/**
 * Capture checkpoint for Cursor's beforeSubmitPrompt
 * Captures all modified files (from git status) since they may have human edits
 */
export declare function captureBeforePromptCheckpoint(repoRoot: string, conversationId: string): Promise<Checkpoint>;
/**
 * Capture checkpoint for a single file (Claude PreToolUse / OpenCode tool.execute.before)
 * More efficient than capturing all modified files since we know the target
 */
export declare function captureFileCheckpoint(repoRoot: string, conversationId: string, filePath: string): Promise<string | null>;
/**
 * Get the "before" blob for a file, using checkpoint if available, else git HEAD
 */
export declare function getBeforeBlob(repoRoot: string, conversationId: string, filePath: string): Promise<string | null>;