import { PdfString } from '../../core/objects/pdf-string.js';
/**
 * Value object that parses and builds DA (Default Appearance) strings.
 * DA format: "/FontName FontSize Tf ColorOp"
 *
 * Extends PdfString so it can be stored directly in dictionaries
 * without additional wrapping.
 */
export declare class PdfDefaultAppearance extends PdfString {
    private _fontName;
    private _fontSize;
    private _colorOp;
    constructor(fontName: string, fontSize: number, colorOp: string);
    get fontName(): string;
    set fontName(name: string);
    get fontSize(): number;
    set fontSize(size: number);
    get colorOp(): string;
    set colorOp(op: string);
    private syncRaw;
    toString(): string;
    static parse(da: string): PdfDefaultAppearance | null;
}