export interface LyHeaderFields {
    title?: string;
    composer?: string;
}
/**
 * Extracts readable plain text from inside a `\markup { ... }` block: quoted-string
 * contents and bare words are kept, `\command` tokens and `#...` Scheme literal
 * arguments (font sizes, colors, alist overrides, etc.) are stripped, and nested
 * `{ }` grouping is flattened — good enough for the formatting-wrapped text
 * commonly seen in real `\header` fields (e.g. `\markup { \bold "Sonata" }`),
 * not a full markup-language evaluator.
 */
export declare function extractMarkupText(markupInner: string): string;
/**
 * Extracts every string-valued header field found anywhere in `source`,
 * across every top-level `\header` block (there can be more than one — e.g.
 * book-level metadata plus a per-`\score` override). When the same field name
 * appears in more than one block, the **last occurrence in the file wins** —
 * approximating LilyPond's own inner-scope-overrides-outer-scope header chain
 * for the common case of a book/top-level header followed by per-score ones.
 */
export declare function parseLyHeaderFields(source: string): Record<string, string>;
/** Extracts `title`/`composer` from the file's header block(s) (see `parseLyHeaderFields`); non-string values (e.g. an unbraced `\markup`, `##f`) are treated as absent. */
export declare function parseLyHeader(source: string): LyHeaderFields;