import type { AddAttachmentInput, Attachment, AttachmentRef, AttachmentStore } from '../types/attachment.js';
import type { ContentBlock } from '../types/blocks.js';
export interface AttachmentStoreOptions {
    /**
     * Directory for spooling payloads larger than `spoolThresholdBytes`.
     * When omitted, all payloads stay in memory.
     */
    spoolDir?: string | undefined;
    spoolThresholdBytes?: number | undefined;
}
/**
 * In-memory attachment store with optional disk spool. Placeholder syntax
 * is `[<kind> #<seq>]` (seq-keyed) or `[file:<path>]` (path-keyed) where kind
 * is `pasted` / `image` / `file`. Unknown placeholders are passed through
 * as-is so users can write that literal text without losing it.
 */
export declare class DefaultAttachmentStore implements AttachmentStore {
    private readonly items;
    private readonly refs;
    private nextSeq;
    private readonly spoolDir;
    private readonly spoolThreshold;
    constructor(opts?: AttachmentStoreOptions);
    add(input: AddAttachmentInput): Promise<AttachmentRef>;
    get(id: string): Promise<Attachment | undefined>;
    list(): AttachmentRef[];
    expand(text: string): Promise<ContentBlock[]>;
    clear(): Promise<void>;
    private toBlock;
}
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