/**
 * DOCX Module - Flat OPC Format Support
 *
 * Implements reading and writing of Flat OPC (Office Open XML Package) format,
 * which represents an entire DOCX package as a single XML file.
 * This is useful for debugging, XML transformations, and enterprise integration scenarios.
 *
 * Flat OPC uses the `pkg:` namespace to wrap all package parts in a single XML document.
 * Each part is represented as a `<pkg:part>` element with its content either as XML or base64.
 *
 * References:
 * - [MS-OFFCRYPTO] §2.1.5 (pkgStart namespace)
 * - ECMA-376 Part 2 (OPC) Annex C (non-normative)
 */
/** A part extracted from Flat OPC XML. */
export interface FlatOpcPart {
    /** Part name (e.g. "/word/document.xml"). */
    readonly name: string;
    /** Content type of the part. */
    readonly contentType: string;
    /** Raw data (decoded from base64 for binary, or UTF-8 encoded XML). */
    readonly data: Uint8Array;
}
/**
 * Parse a Flat OPC XML document into individual package parts.
 * Returns a Map keyed by part path (without leading slash) to binary data,
 * compatible with the archive entry format used by `readDocx`.
 *
 * @param xmlContent - The Flat OPC XML string or UTF-8 bytes.
 * @returns A map of part paths to their binary content.
 */
export declare function parseFlatOpc(xmlContent: string | Uint8Array): Map<string, Uint8Array>;
/**
 * Check if content appears to be a Flat OPC XML document.
 */
export declare function isFlatOpc(content: string | Uint8Array): boolean;
/**
 * Convert a ZIP archive's entries (as a map of path → data) to Flat OPC XML string.
 *
 * @param entries - Map of part paths to their binary content.
 * @param contentTypes - Map of part paths to content types (from [Content_Types].xml).
 * @returns The Flat OPC XML string.
 */
export declare function toFlatOpc(entries: Map<string, Uint8Array>, contentTypes?: Map<string, string>): string;