import { Checkpointer } from './checkpointer';
/**
 * Create a checkpointer that uses the specified file to store persistent state.
 * @param path - Path to a file holding persistent checkpoint state.
 */
export declare function file(path: string): Promise<Checkpointer>;
/**
 * Create a checkpointer that stores its state in memory only.
 */
export declare function inMemory(): Checkpointer;
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