/**
 * EraserTool - Channel-aware circular eraser implementation
 *
 * Phase 3.5: Updated to only erase pixels matching the active channel color
 * on the current layer canvas. Other channels/layers are untouched.
 */
import { BaseTool } from "./BaseTool";
export declare class EraserTool extends BaseTool {
    /**
     * Create the circular eraser function.
     *
     * Channel-aware: only erases pixels whose RGB matches the active channel's color.
     * Only operates on the current layer canvas + master canvas.
     */
    createClearArc(): (x: number, y: number, radius: number) => void;
}