/**
 * Session file migrations (v1 → v3).
 *
 * Migrations mutate entries in place when loading older session files.
 */
import { type FileEntry } from "./types.js";
/** Generate a unique short ID (8 hex chars, collision-checked) */
export declare function generateId(byId: {
    has(id: string): boolean;
}): string;
/**
 * Run all necessary migrations to bring entries to current version.
 * Mutates entries in place. Returns true if any migration was applied.
 */
export declare function migrateToCurrentVersion(entries: FileEntry[]): boolean;
/** Exported for testing */
export declare function migrateSessionEntries(entries: FileEntry[]): void;
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