/**
 * Webhook payload templating
 *
 * Lets actors control the exact shape of the body POSTed to their webhook URL
 * via a JSONata expression. Runs as the LAST step of the webhook pipeline,
 * after schema validation and extended-payload merging.
 *
 * The expression is evaluated against this context:
 *
 *   {
 *     items:     MergedOutputItem[]  // validated + extended items
 *     runId:     string | undefined
 *     count:     number              // items.length
 *     timestamp: string             // ISO-8601, evaluation time
 *   }
 *
 * Whatever the expression returns becomes the request body. Examples:
 *
 *   items.content                                   -> array of content only
 *   { "runId": runId, "count": count, "records": items.content }
 *   $                                                -> the full context object
 *
 * Leaving the expression empty preserves the default behavior (the items array
 * is sent unchanged).
 */
export interface WebhookTemplateContext {
    runId?: string;
    timestamp?: string;
}
/**
 * Thrown when a payload template fails to compile or evaluate. Callers should
 * skip the webhook and record this as the webhook error rather than sending a
 * fallback body, so misconfigurations surface instead of silently delivering
 * the wrong shape.
 */
export declare class WebhookTemplateError extends Error {
    constructor(message: string);
}
/**
 * Compile-check a JSONata expression without evaluating it. Returns an error
 * message if it does not parse, otherwise null. Useful for form/save-time
 * validation.
 */
export declare function validateWebhookPayloadTemplate(expression: string | undefined | null): string | null;
/**
 * Apply a JSONata payload template to the (already validated + extended) items.
 *
 * - If `expression` is empty/whitespace, returns `items` unchanged.
 * - If the expression fails to compile or evaluate, throws WebhookTemplateError
 *   (the caller must skip the webhook and record the error).
 */
export declare function applyWebhookPayloadTemplate(items: any[], expression: string | undefined | null, context?: WebhookTemplateContext): Promise<any>;
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