/**
 * Reusable utility for collecting raw XML fragments during SAX parsing.
 *
 * Many pivot-table xforms need to capture entire sub-trees (extLst, formats,
 * conditionalFormats, filters, fieldGroup, unknown elements, …) as raw strings
 * for roundtrip preservation.  The pattern — `active` flag, `depth` counter,
 * `buffer` of string fragments, plus identical `feedOpen` / `feedClose` /
 * `feedText` logic — was previously copy-pasted across multiple files.
 *
 * Usage:
 * ```ts
 * const collector = new RawXmlCollector("extLst");
 * // In parseOpen, when you see <extLst>:
 * collector.start();                      // opens with <extLst>
 * // For every child open tag while active:
 * collector.feedOpen(name, attributes);
 * // For every text node while active:
 * collector.feedText(text);
 * // For every close tag while active:
 * if (collector.feedClose(name)) { ... }  // returns true when root tag closed
 * // Retrieve result:
 * collector.result;                       // joined XML string
 * ```
 */
declare class RawXmlCollector {
    /** Tag name that this collector captures (e.g. "extLst", "formats"). */
    rootTag: string;
    /** Whether the collector is currently capturing. */
    active: boolean;
    /** Nesting depth *within* the root element (0 = direct children). */
    private depth;
    /** String fragments being accumulated. */
    private buffer;
    /** Index of the last open-tag entry in the buffer (for self-closing collapse). */
    private lastOpenIndex;
    constructor(rootTag: string);
    /**
     * Begin collecting.  Pushes the opening root tag (with optional attributes)
     * and resets depth.
     *
     * @param attributes - Attributes on the root element (may be undefined/null).
     */
    start(attributes?: Record<string, unknown> | null): void;
    /**
     * Begin collecting with a dynamically determined root tag.
     * Used for catch-all unknown element collectors where the tag name
     * is not known at construction time.
     */
    startAs(rootTag: string, attributes?: Record<string, unknown> | null): void;
    /**
     * Reset the collector to its initial idle state.
     */
    reset(): void;
    /**
     * Feed an open-tag event.  Must only be called while `active` is true.
     */
    feedOpen(name: string, attributes?: Record<string, unknown> | null): void;
    /**
     * Feed a text-node event.  Must only be called while `active` is true.
     */
    feedText(text: string): void;
    /**
     * Feed a close-tag event.
     *
     * @returns `true` when the **root** close tag has been received (collector
     *          deactivates itself and the result is ready).  `false` for any
     *          nested close tag.
     */
    feedClose(name: string): boolean;
    /** The collected XML string.  Only meaningful after `feedClose` returns true. */
    get result(): string;
}
/**
 * Serialize an attributes object to an XML attribute string.
 * `null`, `undefined`, and empty objects produce an empty string.
 */
declare function serializeAttributes(attributes?: Record<string, unknown> | null): string;
export { RawXmlCollector, serializeAttributes };