/**
 * Invoice Validator
 *
 * Validates invoice data BEFORE conversion to XML.
 * Implements key Peppol BIS 3.0 business rules with human-readable error messages.
 *
 * Design principle: Errors tell you WHAT's wrong, WHERE it is, and HOW to fix it.
 * No developer should need to Google a Peppol rule ID.
 */
import type { InvoiceInput, ValidationResult } from "../types/invoice.js";
/**
 * Validate an invoice input before sending.
 * Returns human-readable errors with suggestions for fixes.
 */
export declare function validateInvoice(input: InvoiceInput): ValidationResult;
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