import type { ServerConfig, ServerInstance } from '../../../shared/models/server.model.js';
/**
 * Error thrown when tag-match-unique instance selection fails.
 * Passes raw data so the error class itself can format the message.
 */
export declare class TagMatchUniqueError extends Error {
    readonly instanceCount: number;
    readonly requestTags?: Record<string, string> | undefined;
    readonly availableInstances?: Record<number, Record<string, string>> | undefined;
    constructor(instanceCount: number, requestTags?: Record<string, string> | undefined, availableInstances?: Record<number, Record<string, string>> | undefined);
}
/**
 * Instance selector for multi-instance servers
 * Implements three selection strategies: random, round-robin, and tag-match-unique
 */
export declare class InstanceSelector {
    private static roundRobinCounters;
    /**
     * Select best instance based on configured strategy
     *
     * @param serverName - Name of the server
     * @param serverConfig - Server configuration
     * @param requestOptions - Optional request options for instance selection
     * @param statusChecker - Optional function to check instance connection status (for testing)
     */
    static selectInstance(serverName: string, serverConfig: ServerConfig, requestOptions?: {
        sessionId?: string;
        tags?: Record<string, string>;
    }, statusChecker?: (serverName: string, index: number) => {
        connected?: boolean;
    } | undefined): ServerInstance | undefined;
    private static selectRandomInstance;
    private static selectRoundRobinInstance;
    private static selectTagMatchUniqueInstance;
}
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