import { InjectionToken } from '@angular/core';
export declare const FNDY_STORAGE_SERVICE: InjectionToken<StorageService>;
export interface StorageService {
    /**
     * Checks if the value is present in storage
     * @param key The key of the stored value
     * @returns {Promise} True if exists, false if not
     */
    check(key: string): Promise<boolean>;
    /**
     * Gets a key / value pair from storage
     * @param key Key to get
     * @returns resolves with the result
     */
    get(key: string): Promise<any>;
    /**
     * Gets a key / value pair from storage
     * @param key Key to get
     * @returns resolves with the result
     */
    getAll(): Promise<any>;
    /**
     * Stores a new / existing key / value pair in storage
     * @param key Key for value to store
     * @param value The value
     * @returns Resolves when complete
     */
    set(key: string, value: any, opts?: any): Promise<any>;
    /**
     * Removes a key / value pair from storage
     * @param key The key to remove
     * @returns Resolves when done removing
     */
    remove(key: string, opts?: any): Promise<any>;
    /**
     * Clears the entirety of the storage
     * @returns resolves when finishes clearing
     */
    clear(): Promise<any>;
}