import Koa from 'koa';
import 'koa-bodyparser';
declare const webhookRouter: any;
/**
 * Label Studio Webhook Event Types
 */
export declare enum WebhookAction {
    ANNOTATION_CREATED = "ANNOTATION_CREATED",
    ANNOTATION_UPDATED = "ANNOTATION_UPDATED",
    ANNOTATION_DELETED = "ANNOTATION_DELETED",
    TASK_CREATED = "TASK_CREATED",
    TASK_UPDATED = "TASK_UPDATED",
    TASK_DELETED = "TASK_DELETED",
    PROJECT_UPDATED = "PROJECT_UPDATED"
}
export interface WebhookPayload {
    action: WebhookAction;
    project: {
        id: number;
        title: string;
    };
    task?: {
        id: number;
        data: any;
        annotations: any[];
    };
    annotation?: {
        id: number;
        result: any[];
        completed_by: {
            id: number;
            email: string;
        };
        lead_time: number;
    };
}
/**
 * Webhook handler function type
 * Applications can register custom handlers for any webhook action
 */
export type WebhookHandler = (payload: WebhookPayload, context: Koa.Context) => Promise<void>;
/**
 * Register a custom webhook handler
 * Handlers are executed in registration order
 *
 * @param action - Webhook action to handle
 * @param handler - Handler function
 *
 * @example
 * registerWebhookHandler(WebhookAction.ANNOTATION_CREATED, async (payload, ctx) => {
 *   console.log('Custom handler:', payload.annotation?.id)
 *   // Store annotation in database
 *   // Trigger ML training
 *   // Send notifications
 * })
 */
export declare function registerWebhookHandler(action: WebhookAction, handler: WebhookHandler): void;
/**
 * Unregister a webhook handler
 */
export declare function unregisterWebhookHandler(action: WebhookAction, handler: WebhookHandler): void;
/**
 * Clear all custom handlers for an action
 */
export declare function clearWebhookHandlers(action?: WebhookAction): void;
export { webhookRouter };