import { Subject, Observable } from 'rxjs';
import * as i0 from '@angular/core';
import { InjectionToken, NgZone, Provider } from '@angular/core';

declare enum StorageStrategies {
    Local = "local_strategy",
    Session = "session_strategy",
    InMemory = "in_memory_strategy"
}

interface WebStorage {
    readonly length: number;
    clear(): void;
    getItem(key: string): string | null;
    key(index: number): string | null;
    removeItem(key: string): void;
    setItem(key: string, value: string): void;
    [name: string]: any;
}

declare class CompatHelper {
    static isStorageAvailable(storage: WebStorage): boolean;
}

interface StorageStrategy<T> {
    readonly keyChanges: Subject<string>;
    readonly isAvailable: boolean;
    readonly name: string;
    get(key: string): Observable<T>;
    set(key: string, value: T): Observable<T>;
    del(key: string): Observable<void>;
    clear(): Observable<void>;
}

interface StorageService {
    retrieve(key: string): any;
    store(key: string, value: any): any;
    clear(key?: string): any;
    getStrategyName(): string;
    observe(key: string): Observable<any>;
}

declare class SyncStorage implements StorageService {
    protected strategy: StorageStrategy<any>;
    constructor(strategy: StorageStrategy<any>);
    retrieve(key: string): any;
    store(key: string, value: any): any;
    clear(key?: string): void;
    getStrategyName(): string;
    observe(key: string): Observable<any>;
}

declare class AsyncStorage implements StorageService {
    protected strategy: StorageStrategy<any>;
    constructor(strategy: StorageStrategy<any>);
    retrieve(key: string): Observable<any>;
    store(key: string, value: any): Observable<any>;
    clear(key?: string): Observable<void>;
    getStrategyName(): string;
    observe(key: string): Observable<any>;
}

interface StrategyCache {
    [key: string]: any;
}
declare class StrategyCacheService {
    protected caches: {
        [name: string]: StrategyCache;
    };
    get(strategyName: string, key: string): any;
    set(strategyName: string, key: string, value: any): void;
    del(strategyName: string, key: string): void;
    clear(strategyName: string): void;
    protected getCacheStore(strategyName: string): StrategyCache;
    static ɵfac: i0.ɵɵFactoryDeclaration<StrategyCacheService, never>;
    static ɵprov: i0.ɵɵInjectableDeclaration<StrategyCacheService>;
}

declare const LOCAL_STORAGE: InjectionToken<WebStorage>;
declare const SESSION_STORAGE: InjectionToken<WebStorage>;

declare const STORAGE_STRATEGIES: InjectionToken<StorageStrategy<any>>;

declare abstract class BaseSyncStorageStrategy implements StorageStrategy<any> {
    protected storage: WebStorage;
    protected cache: StrategyCacheService;
    readonly keyChanges: Subject<string>;
    abstract readonly name: string;
    constructor(storage: WebStorage, cache: StrategyCacheService);
    protected _isAvailable: boolean;
    get isAvailable(): boolean;
    get(key: string): Observable<any>;
    set(key: string, value: any): Observable<any>;
    del(key: string): Observable<void>;
    clear(): Observable<void>;
}

declare class LocalStorageStrategy extends BaseSyncStorageStrategy {
    protected storage: WebStorage;
    protected cache: StrategyCacheService;
    protected platformId: any;
    protected zone: NgZone;
    static readonly strategyName: string;
    readonly name: string;
    constructor(storage: WebStorage, cache: StrategyCacheService, platformId: any, zone: NgZone);
    protected listenExternalChanges(): void;
    static ɵfac: i0.ɵɵFactoryDeclaration<LocalStorageStrategy, never>;
    static ɵprov: i0.ɵɵInjectableDeclaration<LocalStorageStrategy>;
}

declare class SessionStorageStrategy extends BaseSyncStorageStrategy {
    protected storage: WebStorage;
    protected cache: StrategyCacheService;
    protected platformId: any;
    protected zone: NgZone;
    static readonly strategyName: string;
    readonly name: string;
    constructor(storage: WebStorage, cache: StrategyCacheService, platformId: any, zone: NgZone);
    protected listenExternalChanges(): void;
    static ɵfac: i0.ɵɵFactoryDeclaration<SessionStorageStrategy, never>;
    static ɵprov: i0.ɵɵInjectableDeclaration<SessionStorageStrategy>;
}

declare class InMemoryStorageStrategy implements StorageStrategy<any> {
    protected cache: StrategyCacheService;
    static readonly strategyName: string;
    readonly keyChanges: Subject<string>;
    isAvailable: boolean;
    readonly name: string;
    constructor(cache: StrategyCacheService);
    get(key: string): Observable<any>;
    set(key: string, value: any): Observable<any>;
    del(key: string): Observable<void>;
    clear(): Observable<void>;
    static ɵfac: i0.ɵɵFactoryDeclaration<InMemoryStorageStrategy, never>;
    static ɵprov: i0.ɵɵInjectableDeclaration<InMemoryStorageStrategy>;
}

declare const StorageStrategyStubName: string;
declare class StorageStrategyStub implements StorageStrategy<any> {
    readonly keyChanges: Subject<string>;
    store: any;
    _available: boolean;
    readonly name: string;
    constructor(name?: string);
    get isAvailable(): boolean;
    get(key: string): Observable<any>;
    set(key: string, value: any): Observable<any>;
    del(key: string): Observable<void>;
    clear(): Observable<void>;
}

declare class StorageStub implements WebStorage {
    [name: string]: any;
    store: {
        [prop: string]: any;
    };
    get length(): number;
    clear(): void;
    getItem(key: string): string | null;
    key(index: number): string | null;
    removeItem(key: string): void;
    setItem(key: string, value: string): void;
}

declare const InvalidStrategyError = "invalid_strategy";
declare class StrategyIndex {
    protected strategies: StorageStrategy<any>[];
    static index: {
        [name: string]: StorageStrategy<any>;
    };
    readonly registration$: Subject<string>;
    constructor(strategies: StorageStrategy<any>[]);
    static get(name: string): StorageStrategy<any>;
    static set(name: string, strategy: any): void;
    static clear(name?: string): void;
    static isStrategyRegistered(name: string): boolean;
    static hasRegistredStrategies(): boolean;
    getStrategy(name: string): StorageStrategy<any>;
    indexStrategies(): void;
    indexStrategy(name: string, overrideIfExists?: boolean): StorageStrategy<any>;
    register(name: string, strategy: StorageStrategy<any>, overrideIfExists?: boolean): void;
    static ɵfac: i0.ɵɵFactoryDeclaration<StrategyIndex, [{ optional: true; }]>;
    static ɵprov: i0.ɵɵInjectableDeclaration<StrategyIndex>;
}

declare class LocalStorageService extends SyncStorage {
}

declare class SessionStorageService extends SyncStorage {
}

declare function LocalStorage(key?: string, defaultValue?: any): (prototype: any, propName: any) => void;
declare function SessionStorage(key?: string, defaultValue?: any): (prototype: any, propName: any) => void;

interface NgxWebstorageConfiguration {
    prefix?: string;
    separator?: string;
    caseSensitive?: boolean;
}

declare const LIB_CONFIG: InjectionToken<NgxWebstorageConfiguration>;
declare enum InternalNgxWebstorageFeatureKind {
    Config = 1,
    LocalStorage = 2,
    SessionStorage = 3
}
type NgxWebstorageFeatureKind = string | InternalNgxWebstorageFeatureKind;
type NgxWebstorageFeature<FeatureKind extends NgxWebstorageFeatureKind> = {
    kind: FeatureKind;
    providers: Provider[];
};
/**
 * Provide ngx-webstorage basic features.
 *
 * - You can customise the configuration with the `withConfiguration` feature.
 * - You can enable the `LocalStorage` features with the `withLocalStorage` feature.
 * - You can enable the `SessionStorage` features with the `withSessionStorage` feature.
 *
 * @default config { prefix: 'ngx-webstorage', separator: '|', caseSensitive: false }
 */
declare function provideNgxWebstorage(...features: NgxWebstorageFeature<NgxWebstorageFeatureKind>[]): i0.EnvironmentProviders;
declare function makeNgxWebstorageFeature<FeatureKind extends NgxWebstorageFeatureKind>(kind: FeatureKind, providers: Provider[]): NgxWebstorageFeature<FeatureKind>;
declare function withNgxWebstorageConfig(config: NgxWebstorageConfiguration): NgxWebstorageFeature<InternalNgxWebstorageFeatureKind.Config>;
/** Provides everything necessary to use the `LocalStorage` features. */
declare function withLocalStorage(): NgxWebstorageFeature<InternalNgxWebstorageFeatureKind.LocalStorage>;
declare function withSessionStorage(): NgxWebstorageFeature<InternalNgxWebstorageFeatureKind.SessionStorage>;

export { AsyncStorage, CompatHelper, InMemoryStorageStrategy, InternalNgxWebstorageFeatureKind, InvalidStrategyError, LIB_CONFIG, LOCAL_STORAGE, LocalStorage, LocalStorageService, LocalStorageStrategy, SESSION_STORAGE, STORAGE_STRATEGIES, SessionStorage, SessionStorageService, SessionStorageStrategy, StorageStrategies, StorageStrategyStub, StorageStrategyStubName, StorageStub, StrategyCacheService, StrategyIndex, SyncStorage, makeNgxWebstorageFeature, provideNgxWebstorage, withLocalStorage, withNgxWebstorageConfig, withSessionStorage };
export type { NgxWebstorageFeature, NgxWebstorageFeatureKind, StorageStrategy, StrategyCache };