import type { CheckpointId } from '../../types/ids/index.js';
import type { Checkpoint } from '../../types/session/checkpoint.js';
import { type CheckpointLogView, type CheckpointScope, type CheckpointWriteReceipt, type SessionCheckpointStore } from './contract.js';
export interface InMemorySessionCheckpointStoreOptions {
    /** The session log the checkpoints are verified and protected against. */
    readonly log: CheckpointLogView;
}
/**
 * Process-local {@link SessionCheckpointStore}, keyed by the full
 * tenant/project/session/turn scope.
 *
 * It keeps the serialised bytes rather than the object, so `restore` hashes
 * exactly what `write` hashed and refuses exactly what the disk store
 * refuses. It is the parity partner of the disk store and the store an
 * in-memory session keeps its checkpoints in.
 */
export declare class InMemorySessionCheckpointStore implements SessionCheckpointStore {
    #private;
    constructor(options: InMemorySessionCheckpointStoreOptions);
    write(scope: CheckpointScope, checkpoint: Checkpoint): Promise<CheckpointWriteReceipt>;
    read(scope: CheckpointScope, checkpointId: CheckpointId): Promise<Checkpoint | null>;
    restore(scope: CheckpointScope, checkpointId: CheckpointId): Promise<Checkpoint | null>;
    list(scope: CheckpointScope): Promise<Checkpoint[]>;
    delete(scope: CheckpointScope, checkpointId: CheckpointId): Promise<void>;
    prune(scope: CheckpointScope, keepLast: number): Promise<CheckpointId[]>;
}
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