/**
 * Area represents the global regions where the Open API gateway endpoint is located
 */
export declare enum Area {
    Unknown = 0,
    /** US represents the western and eastern regions of the United States */
    US = 1,
    /** EU represents the western and central regions of Europe */
    EU = 2,
    /** AP represents the southeastern and northeastern regions of Asia-Pacific */
    AP = 3,
    /** CN represents the eastern and northern regions of Chinese mainland */
    CN = 4
}
export declare const ChineseMainlandMajorDomain = "sd-rtn.com";
export declare const OverseaMajorDomain = "agora.io";
export declare const GlobalDomainPrefix = "api";
export declare const USWestRegionDomainPrefix = "api-us-west-1";
export declare const USEastRegionDomainPrefix = "api-us-east-1";
export declare const APSoutheastRegionDomainPrefix = "api-ap-southeast-1";
export declare const APNortheastRegionDomainPrefix = "api-ap-northeast-1";
export declare const EUWestRegionDomainPrefix = "api-eu-west-1";
export declare const EUCentralRegionDomainPrefix = "api-eu-central-1";
export declare const CNEastRegionDomainPrefix = "api-cn-east-1";
export declare const CNNorthRegionDomainPrefix = "api-cn-north-1";
export declare const GlobalAPIPath = "/api/conversational-ai-agent";
export declare const CNAPIPath = "/cn/api/conversational-ai-agent";
/**
 * Domain contains the regional prefixes and domain suffixes for an area
 */
export interface Domain {
    regionDomainPrefixes: string[];
    majorDomainSuffixes: string[];
}
/**
 * RegionDomain maps areas to their domain configurations
 */
export declare const RegionDomain: Record<Area, Domain>;
/**
 * Resolver is an interface for resolving the best domain
 */
export interface Resolver {
    resolve(domains: string[], regionPrefix: string, signal?: AbortSignal): Promise<string>;
}
/**
 * Pool manages a pool of regional URLs with automatic cycling and domain selection
 */
export declare class Pool {
    private domainArea;
    private domainSuffixes;
    private currentDomain;
    private regionPrefixes;
    private currentRegionPrefixes;
    private resolver;
    private lastUpdate;
    constructor(domainArea: Area);
    private domainNeedUpdate;
    /**
     * SelectBestDomain uses DNS resolution to select the best available domain
     */
    selectBestDomain(signal?: AbortSignal): Promise<void>;
    /**
     * NextRegion cycles to the next region prefix in the pool
     */
    nextRegion(): void;
    private selectDomain;
    /**
     * GetCurrentURL returns the current URL based on the selected region and domain
     */
    getCurrentURL(): string;
    /**
     * Get the current area
     */
    getArea(): Area;
}
/**
 * Creates a new Pool for the specified area
 */
export declare function createPool(area: Area): Pool;