export declare function isFrontmatterValid(frontmatter: Record<string, any>): boolean;
export declare function extractFrontmatter(code: string): string | undefined;
export interface ParseFrontmatterOptions {
    /**
     * How the frontmatter should be handled in the returned `content` string.
     * - `preserve`: Keep the frontmatter.
     * - `remove`: Remove the frontmatter.
     * - `empty-with-spaces`: Replace the frontmatter with empty spaces. (preserves sourcemap line/col/offset)
     * - `empty-with-lines`: Replace the frontmatter with empty line breaks. (preserves sourcemap line/col)
     *
     * @default 'remove'
     */
    frontmatter: 'preserve' | 'remove' | 'empty-with-spaces' | 'empty-with-lines';
}
export interface ParseFrontmatterResult {
    frontmatter: Record<string, any>;
    rawFrontmatter: string;
    content: string;
}
export declare function parseFrontmatter(code: string, options?: ParseFrontmatterOptions): ParseFrontmatterResult;