export interface FrontmatterSplit {
    /** YAML text between the opening and closing `---` fences. */
    yaml: string;
    /** Markdown body following the closing fence. */
    body: string;
    /** 1-based line number of the opening `---` fence. */
    fenceStartLine: number;
    /** 1-based line number of the first YAML line inside the fences. */
    yamlStartLine: number;
    /** 1-based line number of the first body line after the closing fence. */
    bodyStartLine: number;
}
export declare class FrontmatterError extends Error {
    readonly line: number | undefined;
    constructor(message: string, line?: number);
}
/**
 * Split a markdown document into YAML frontmatter and body.
 *
 * Strict: the document must begin with `---` (optionally preceded by blank lines)
 * and a matching closing `---` must exist. Throws FrontmatterError otherwise.
 *
 * Line numbers are 1-based and absolute to the input source so callers can map
 * downstream errors back to the original file.
 */
export declare function splitFrontmatter(source: string): FrontmatterSplit;
//# sourceMappingURL=frontmatter.d.ts.map