import type { Provider, TaskTypeName } from '../task/task-state.js';
import type { BaseProviderAdapter } from './base-adapter.js';
/**
 * Central registry for provider adapters.
 *
 * Supports:
 * - Registration by provider ID
 * - Default fallback provider
 * - Per-task-type routing overrides
 * - Bulk shutdown
 */
export declare class ProviderRegistry {
    private readonly adapters;
    private defaultProvider;
    private readonly taskTypeRoutes;
    /** Register an adapter. Keyed by its `id` property. */
    register(adapter: BaseProviderAdapter): void;
    /** Set the fallback provider used when no task-type route matches. */
    setDefault(provider: Provider): void;
    /** Override routing for a specific task type. */
    setTaskTypeRoute(taskType: TaskTypeName, provider: Provider): void;
    /** Look up an adapter by provider ID. */
    getAdapter(provider: Provider): BaseProviderAdapter | undefined;
    /**
     * Select the best adapter for a given task type.
     *
     * Resolution order:
     * 1. Explicit task-type route
     * 2. Default provider
     * 3. First registered adapter (arbitrary but deterministic)
     */
    selectForTaskType(taskType: TaskTypeName): BaseProviderAdapter | undefined;
    /** Return all registered adapters. */
    getAllAdapters(): BaseProviderAdapter[];
    /** Shut down all registered adapters in parallel. */
    shutdownAll(): Promise<void>;
}