/**
 * Webhook types and utilities.
 */
export interface WebhookConfig {
    url: string;
    secret?: string;
    retries?: number;
    timeout?: number;
}
export interface WebhookEvent {
    type: WebhookEventType;
    timestamp: string;
    data: Record<string, unknown>;
}
export type WebhookEventType = "prediction.created" | "prediction.processing" | "prediction.succeeded" | "prediction.failed" | "prediction.canceled";
export interface WebhookDeliveryResult {
    success: boolean;
    statusCode?: number;
    error?: string;
    retryCount: number;
    timestamp: string;
}
/**
 * Generate a webhook signature for request verification.
 */
export declare function generateWebhookSignature(payload: string, secret: string): string;
/**
 * Verify a webhook signature from request headers.
 */
export declare function verifyWebhookSignature(payload: string, signature: string, secret: string): boolean;
/**
 * Format a webhook event payload.
 */
export declare function formatWebhookEvent(type: WebhookEventType, data: Record<string, unknown>): WebhookEvent;
/**
 * Validate webhook configuration.
 */
export declare function validateWebhookConfig(config: WebhookConfig): string[];
/**
 * Default webhook configuration.
 */
export declare const DEFAULT_WEBHOOK_CONFIG: Partial<WebhookConfig>;
/**
 * Retry delay calculator with exponential backoff.
 */
export declare function calculateRetryDelay(attempt: number, baseDelay?: number): number;