import { BodyElement } from '../core/document-model/index.js';
/**
 * Expand a print header/footer `&`-code string (E-SHEET W4) into header/footer band
 * content — one aligned paragraph per non-empty left/centre/right region — or `[]`
 * when every region is empty. `&P`/`&N` become dynamic PAGE/NUMPAGES field runs the
 * renderer resolves per page; non-deterministic or unsupported codes are dropped.
 *
 * @param formatString The raw `&`-code format string.
 * @param sheetName    The worksheet tab name, substituted for `&A`.
 * @param scale        The sheet's print scale.
 * @param basePt       The default header font size.
 * @param fileName     The workbook's file name, substituted for `&F`. A
 *                     byte-oriented API does not know it, so the caller supplies
 *                     it; absent, `&F` is dropped as before.
 * @param themePalette The workbook theme, resolving a `&K` theme reference.
 * @param now          The reference date `&D`/`&T` print. An explicit input,
 *                     never the wall clock; absent, both are dropped as before.
 */
export declare function buildHeaderFooterContent(formatString: string, sheetName: string, scale?: number, basePt?: number, fileName?: string, themePalette?: ReadonlyMap<string, string>, now?: Date): Array<BodyElement>;