import { ModelInterface } from '../models/util';
export declare class StorageEngineField {
    protected modelClass?: ModelInterface;
    defaultValue: any;
    constructor(defaultValue?: any, modelClass?: ModelInterface);
    toFront(value: any): any;
    toBack(value: any): any;
}
export declare abstract class StorageEngine {
    protected name: string;
    protected fields: {
        [key: string]: StorageEngineField;
    };
    constructor(name: string, fields: {
        [key: string]: StorageEngineField;
    });
    addField(key: string, field: StorageEngineField): void;
    save(key: string, value: any): void;
    get(key: string): any;
    clear(): void;
    protected getItem(key: string): any;
    protected setItem(key: string, value: any): any;
    protected removeItem(key: string): void;
}