import type { CanvasLike } from "./canvas-factory.js";
import { CanvasToolkitBase } from "./canvas-toolkit.base.js";
/**
 * Node.js canvas toolkit with file-system operations.
 * Extends CanvasToolkitBase with saveImage() and clearOutput().
 */
export declare class CanvasToolkit extends CanvasToolkitBase {
    private static _nodeInstance;
    protected constructor();
    /** Return the singleton instance of {@link CanvasToolkit}. */
    static getInstance(): CanvasToolkit;
    /**
     * Save a canvas to an image file
     * @param options
     * @param options.canvas Source canvas
     * @param options.filename Filename of the image file
     * @param options.path Path to save the image file (default: "out")
     * @returns A promise that resolves when the image is saved
     * @example
     * await CanvasToolkit.getInstance().saveImage({
     *   canvas: sourceCanvas,
     *   filename: "output.png",
     * });
     */
    saveImage(options: {
        canvas: CanvasLike;
        filename: string;
        path: string;
    }): Promise<void>;
    /**
     * Clear the output folder
     * @param path Path to the output folder (default: "out")
     */
    clearOutput(path?: string): void;
}