/**
 * Replace a placeholder string in word/document.xml with a raw XML fragment.
 *
 * The placeholder must already be present in the document's XML. Both
 * placeholder and xmlFragment are inserted verbatim — caller is responsible
 * for producing well-formed WordprocessingML.
 *
 * @param docxBuffer  - A valid DOCX file as a Buffer.
 * @param placeholder - The exact string to find and replace in word/document.xml.
 * @param xmlFragment - The raw XML string that replaces the placeholder.
 * @returns A new DOCX Buffer with the substitution applied.
 * @throws If word/document.xml is missing or the placeholder is not found.
 */
export declare function injectXml(docxBuffer: Buffer, placeholder: string, xmlFragment: string): Promise<Buffer>;
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