import type { ONICheckpoint, ONICheckpointer, CheckpointListOptions } from "../types.js";
export declare class PostgresCheckpointer<S> implements ONICheckpointer<S> {
    private readonly pool;
    private constructor();
    static create<S>(connectionString: string): Promise<PostgresCheckpointer<S>>;
    get(threadId: string): Promise<ONICheckpoint<S> | null>;
    put(cp: ONICheckpoint<S>): Promise<void>;
    list(threadId: string, opts?: CheckpointListOptions): Promise<ONICheckpoint<S>[]>;
    delete(threadId: string): Promise<void>;
    close(): Promise<void>;
    private deserialize;
}
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