/**
 * Storage Registry
 *
 * Manages multiple storage controllers for Rebase backend.
 * Allows different storage backends for different use cases.
 *
 * Usage:
 * - Single storage: Pass a single StorageController → maps to "(default)"
 * - Multiple storages: Pass a map of { storageId: StorageController }
 * - String properties use `storageId` in their config to specify which storage to use
 * - Properties without `storageId` fallback to "(default)"
 */
import { StorageController } from "./types";
/**
 * The default storage identifier used when:
 * - A single storage controller is provided (not a map)
 * - A property doesn't specify a storageId
 */
export declare const DEFAULT_STORAGE_ID = "(default)";
/**
 * Registry for managing multiple storage controllers
 */
export interface StorageRegistry {
    /**
     * Register a storage controller with an ID
     * @param id - Unique identifier for this storage (e.g., "media", "backups")
     * @param controller - The StorageController instance
     */
    register(id: string, controller: StorageController): void;
    /**
     * Get the default storage controller (id = "(default)")
     * @throws Error if no default storage is registered
     */
    getDefault(): StorageController;
    /**
     * Get a storage controller by ID
     * @param id - Storage identifier, or undefined/null for default
     * @returns The StorageController, or undefined if not found
     */
    get(id: string | undefined | null): StorageController | undefined;
    /**
     * Get a storage controller by ID, with fallback to default
     * @param id - Storage identifier, or undefined/null for default
     * @returns The StorageController (falls back to default if id not found)
     * @throws Error if neither the specified nor default storage exists
     */
    getOrDefault(id: string | undefined | null): StorageController;
    /**
     * Check if a storage with the given ID exists
     */
    has(id: string): boolean;
    /**
     * List all registered storage IDs
     */
    list(): string[];
    /**
     * Get the number of registered storage controllers
     */
    size(): number;
}
/**
 * Default implementation of StorageRegistry
 */
export declare class DefaultStorageRegistry implements StorageRegistry {
    private controllers;
    /**
     * Create a StorageRegistry from either a single controller or a map
     * @param input - Single StorageController (maps to "(default)") or Record<string, StorageController>
     */
    static create(input: StorageController | Record<string, StorageController>): DefaultStorageRegistry;
    register(id: string, controller: StorageController): void;
    getDefault(): StorageController;
    get(id: string | undefined | null): StorageController | undefined;
    getOrDefault(id: string | undefined | null): StorageController;
    has(id: string): boolean;
    list(): string[];
    size(): number;
}