/**
 * PDF module error types.
 */
import { BaseError } from "../../utils/errors.js";
/**
 * Base class for all PDF-related errors.
 */
export declare class PdfError extends BaseError {
    name: string;
}
/**
 * Error thrown when PDF rendering fails (layout, drawing, content generation).
 */
export declare class PdfRenderError extends PdfError {
    name: string;
}
/**
 * Error thrown when font operations fail (missing glyph, unsupported font).
 */
export declare class PdfFontError extends PdfError {
    name: string;
}
/**
 * Error thrown when the PDF file structure is invalid.
 */
export declare class PdfStructureError extends PdfError {
    name: string;
}
/**
 * Check if an error is a PdfError.
 */
export declare function isPdfError(err: unknown): err is PdfError;