/**
 * Persistence - Handles chrome.storage operations
 *
 * Responsibilities:
 * - Hydrate state from storage on startup
 * - Persist state changes to storage
 * - Manage storage key structure: crann:{name}:v{version}:{key}
 */
import { ConfigSchema, ValidatedConfig, DerivedSharedState, StoreOptions } from "./types";
export declare class Persistence<TConfig extends ConfigSchema> {
    private readonly config;
    private readonly options;
    constructor(config: ValidatedConfig<TConfig>, options?: StoreOptions);
    /**
     * Build a storage key with the structured format.
     * Format: crann:{name}:v{version}:{key}
     */
    private buildKey;
    /**
     * Parse a storage key to extract components.
     */
    private parseKey;
    /**
     * Get the metadata key for this store.
     * Format: crann:{name}:__meta
     */
    private getMetaKey;
    /**
     * Hydrate state from chrome.storage.
     * Only loads keys that exist in the current config.
     */
    hydrate(): Promise<Partial<DerivedSharedState<TConfig>>>;
    /**
     * Persist state changes to storage.
     * Only persists keys with persist: 'local' or 'session'.
     */
    persist(state: Partial<DerivedSharedState<TConfig>>): Promise<void>;
    /**
     * Clear all persisted data for this store.
     */
    clearAll(): Promise<void>;
    private updateMetadata;
}
/**
 * Find and remove orphaned Crann data from storage.
 *
 * @example
 * const removed = await clearOrphanedData({
 *   keepStores: ['myFeature', 'otherStore'],
 *   dryRun: true,
 * });
 */
export declare function clearOrphanedData(options: {
    keepStores: string[];
    dryRun?: boolean;
}): Promise<{
    keys: string[];
    count: number;
}>;