/**
 * Generic "BOZZA" (draft) watermark injection for DOCX files.
 *
 * Ported from apps/api/src/features/finance/invoice/document/inject-draft-watermark.ts
 * and adapted to accept/return a Buffer instead of a JSZip instance, so it
 * can be used as a standalone utility without the caller needing to manage
 * the JSZip lifecycle.
 *
 * The original file remains in place until T5/T6 migration work (it will be
 * deleted once the invoice generator is refactored to use this library util).
 */
/**
 * Inject an idempotent "BOZZA" watermark into the document's default header.
 *
 * Accepts a DOCX as a Buffer and returns a new DOCX Buffer with the watermark
 * applied. Re-running on the same document is safe — the SENTINEL marker is
 * checked first so the watermark is never double-injected.
 *
 * @param docxBuffer - A valid DOCX file as a Buffer.
 * @param text       - Watermark text (defaults to "BOZZA").
 * @returns A new DOCX Buffer with the watermark injected.
 */
export declare function injectDraftWatermark(docxBuffer: Buffer, text?: string): Promise<Buffer>;
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