export type ServiceAuthType = 'cookie' | 'token' | 'none';
export type ServiceErrorHandler = 'silent' | 'console.error' | 'console.warn' | 'throw';
export type ServiceErrorListener = (err: Error) => void;
export interface ServiceHealth {
    readonly status: boolean;
}
export interface ServiceAuth {
    readonly type: ServiceAuthType;
    readonly token?: string | null;
}
export interface ServiceOptions {
    readonly gzip?: boolean | null;
    readonly tls?: boolean | null;
    readonly healthCheck?: boolean | null;
    readonly retry?: {
        readonly tries: number;
    };
    readonly errorHandler?: ServiceErrorHandler | null;
    readonly errorListener?: ServiceErrorListener | null;
    readonly version?: number | null;
}
export interface ServiceConfig {
    readonly url: string;
    readonly options?: ServiceOptions | null;
    readonly auth?: ServiceAuth | null;
}
/**
 * Locked down, immutable version of ServiceConfig with defaults already set
 */
export interface LockedServiceConfig {
    readonly url: string;
    readonly options: {
        readonly version: string;
        readonly tls: boolean;
        readonly gzip: boolean;
        readonly errorHandler: ServiceErrorHandler;
        readonly errorListener: ServiceErrorListener;
        readonly retry: {
            readonly tries: number;
        };
    };
    readonly auth: {
        readonly type: ServiceAuthType;
        readonly token: string | null;
    };
}
/**
 * Allows configuration of a connection service to an api-core based backend service
 */
export declare class Service {
    private static _defaultServiceInstance;
    private readonly _config;
    private _health;
    constructor(config: ServiceConfig);
    /**
     * Configure a new default service
     */
    static config(config: ServiceConfig): Service;
    /**
     * Returns the default service object
     */
    static get default(): Service;
    /**
     * Checks the health of this service by performing a DNS lookup
     * NOTE: This will always return `true` for non-nodeJS environments
     */
    checkHealth(forced?: boolean): Promise<boolean>;
    /**
     * Returns the currently locked, read-only Service Configuration
     */
    get config(): LockedServiceConfig;
    /**
     * This returns the base url and versioning combined
     */
    get url(): string;
}