import type * as crud from '../crud/types';
type CowState = {
    files: Set<string>;
    cols: Set<string>;
};
/**
 * Copy-on-write CRUD-fs. Accepts two file systems: (1) *base* the source of data;
 * (2) *overlay* the writable layer. Initially all reads are served from the
 * *base* layer, if a file or folder structure gets "tainted" (modified) a copy
 * of those resources are copied and modified in the *overlay* layer. Subsequently,
 * the reads of tainted resources will be served from the *overlay* layer.
 */
export declare class CowCrud implements crud.CrudApi {
    protected readonly base: crud.CrudApi;
    protected readonly overlay: crud.CrudApi;
    protected readonly _state: CowState;
    protected readonly _prefix: string[];
    constructor(base: crud.CrudApi, overlay: crud.CrudApi, state?: CowState, prefix?: string[]);
    private _fullPath;
    private _isColTombstoned;
    private _isFileTombstoned;
    private _existsResource;
    private _existsCollection;
    private _clearFileTombstone;
    readonly put: (path: string, data?: Uint8Array | undefined, options?: crud.CrudPutOptions) => Promise<void>;
    readonly getStream: (path: string) => Promise<ReadableStream>;
    readonly del: (path: string, silent?: boolean) => Promise<void>;
    readonly info: (path: string) => Promise<crud.CrudResourceInfo>;
    readonly drop: (path: string, silent?: boolean) => Promise<void>;
    readonly scan: any;
    readonly list: (path: string) => Promise<crud.CrudCollectionEntry[]>;
    readonly from: (path: string) => Promise<crud.CrudApi>;
}
export {};