export declare const SNAPSHOT_ENTRY_TYPE = "undo-snapshot";
export type ChangeKind = "content" | "diff";
export interface FileChange {
    path: string;
    existedBefore: boolean;
    kind: ChangeKind;
    before?: string;
    after?: string;
    diff?: string;
    beforeHash?: string;
    afterHash?: string;
}
export interface Snapshot {
    id: string;
    turn: number;
    leafEntryId: string;
    timestamp: string;
    changes: FileChange[];
}
export type ApplyDirection = "forward" | "reverse";
export type FileAction = "modified" | "added" | "deleted";
export interface FileChangeOutcome {
    path: string;
    action: FileAction;
    /** Set when the current on-disk content differed from the expected state and was backed up before overwriting. */
    backupPath?: string;
    /** For modified files: lines added/removed by the snapshot's edit. */
    linesAdded?: number;
    linesRemoved?: number;
}
export interface ApplyReport {
    applied: number;
    files: FileChangeOutcome[];
}
export interface TreeLike {
    getEntry(id: string): {
        id: string;
        parentId: string | null;
    } | undefined;
}
export interface FileOps {
    readText(path: string): Promise<string | undefined>;
    writeText(path: string, content: string): Promise<void>;
    deleteFile(path: string): Promise<void>;
    writeBackup(path: string, content: string): Promise<string>;
}