import type { OptionsBase } from "./ConfigCatClientOptions";
import type { IConfigFetcher } from "./ConfigFetcher";
import { FetchResult } from "./ConfigFetcher";
import { ProjectConfig } from "./ProjectConfig";
/** Contains the result of an `IConfigCatClient.forceRefreshAsync` operation. */
export declare class RefreshResult {
    /** Error message in case the operation failed, otherwise `null`. */
    errorMessage: string | null;
    /** The exception object related to the error in case the operation failed (if any). */
    errorException?: any;
    constructor(
    /** Error message in case the operation failed, otherwise `null`. */
    errorMessage: string | null, 
    /** The exception object related to the error in case the operation failed (if any). */
    errorException?: any);
    /** Indicates whether the operation was successful or not. */
    get isSuccess(): boolean;
    static from(fetchResult: FetchResult): RefreshResult;
    /** Creates an instance of the `RefreshResult` class which indicates that the operation was successful. */
    static success(): RefreshResult;
    /** Creates an instance of the `RefreshResult` class which indicates that the operation failed. */
    static failure(errorMessage: string, errorException?: any): RefreshResult;
}
/** Specifies the possible states of the internal cache. */
export declare enum ClientCacheState {
    /** No config data is available in the internal cache. */
    NoFlagData = 0,
    /** Only config data provided by local flag override is available in the internal cache. */
    HasLocalOverrideFlagDataOnly = 1,
    /** Only expired config data obtained from the external cache or the ConfigCat CDN is available in the internal cache. */
    HasCachedFlagDataOnly = 2,
    /** Up-to-date config data obtained from the external cache or the ConfigCat CDN is available in the internal cache. */
    HasUpToDateFlagData = 3
}
export interface IConfigService {
    readonly readyPromise: Promise<ClientCacheState>;
    getConfig(): Promise<ProjectConfig>;
    refreshConfigAsync(): Promise<[RefreshResult, ProjectConfig]>;
    readonly isOffline: boolean;
    setOnline(): void;
    setOffline(): void;
    getCacheState(cachedConfig: ProjectConfig): ClientCacheState;
    dispose(): void;
}
export declare abstract class ConfigServiceBase<TOptions extends OptionsBase> {
    protected readonly configFetcher: IConfigFetcher;
    protected readonly options: TOptions;
    private status;
    private pendingCacheSyncUp;
    private pendingConfigRefresh;
    protected readonly cacheKey: string;
    abstract readonly readyPromise: Promise<ClientCacheState>;
    constructor(configFetcher: IConfigFetcher, options: TOptions);
    dispose(): void;
    protected get disposed(): boolean;
    abstract getConfig(): Promise<ProjectConfig>;
    refreshConfigAsync(): Promise<[RefreshResult, ProjectConfig]>;
    protected refreshConfigCoreAsync(latestConfig: ProjectConfig): Promise<[FetchResult, ProjectConfig]>;
    protected onConfigFetched(newConfig: ProjectConfig): void;
    protected onConfigChanged(newConfig: ProjectConfig): void;
    private fetchAsync;
    private fetchRequestAsync;
    protected get isOfflineExactly(): boolean;
    get isOffline(): boolean;
    protected goOnline(): void;
    setOnline(): void;
    setOffline(): void;
    abstract getCacheState(cachedConfig: ProjectConfig): ClientCacheState;
    protected syncUpWithCache(): ProjectConfig | Promise<ProjectConfig>;
    private onCacheSynced;
    protected getReadyPromise<TState>(state: TState, waitForReadyAsync: (state: TState) => Promise<ClientCacheState>): Promise<ClientCacheState>;
}
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