import { type Ref } from '#imports';
import type { FetchError } from 'ofetch';
export interface WorkerInfo {
    id: string;
    name: string | null;
    status: 'connected' | 'disconnected' | string;
    runtime: 'rust' | 'node' | 'python' | string | null;
    version: string | null;
    os: string | null;
    pid: number | null;
    ip_address: string;
    connected_at_ms: number;
    active_invocations: number;
    function_count: number;
    functions?: string[];
    latest_metrics: WorkerMetrics | null;
    isolation?: 'in-process' | 'sidecar' | 'plugin' | string;
    description?: string | null;
}
export interface WorkerMetrics {
    cpu_percent: number;
    memory_heap_used: number;
    memory_heap_total: number;
    memory_rss: number;
    memory_external: number;
    cpu_user_micros: number;
    cpu_system_micros: number;
    event_loop_lag_ms: number;
    uptime_seconds: number;
    timestamp_ms: number;
    runtime: string;
}
export interface HealthComponent {
    status: string;
    details: Record<string, unknown>;
}
export interface EngineHealth {
    status: string;
    version: string;
    timestamp: number;
    components: Record<string, HealthComponent>;
}
export interface WorkersData {
    health: EngineHealth | null;
    healthError: string | null;
    workers: WorkerInfo[];
    workersError: string | null;
}
/**
 * Composable for fetching engine health + worker list.
 * Polls every 5 seconds to give a live production view.
 */
export declare function useWorkers(pollIntervalMs?: number): {
    data: Ref<WorkersData | null | undefined>;
    refresh: () => Promise<void>;
    status: Ref<'idle' | 'pending' | 'success' | 'error'>;
    error: Ref<FetchError | null | undefined>;
    engineOnline: Ref<boolean>;
};