/**
 * A shader effect that draws a colored outline around the sprite.
 * Works by sampling neighboring pixels — if any neighbor is opaque but the
 * current pixel is transparent, it draws the outline color.
 * Commonly used for selection highlights, hover states, or collectible glow.
 * @category Effects
 * @see {@link Renderable.shader} for usage
 * @example
 * // yellow outline for selection
 * mySprite.shader = new OutlineEffect(renderer, {
 *     color: [1.0, 1.0, 0.0],
 *     width: 2.0,
 * });
 * @example
 * // remove the effect
 * mySprite.shader = undefined;
 */
export default class OutlineEffect extends ShaderEffect {
    /**
     * @param {import("../webgl_renderer.js").default} renderer - the current renderer instance
     * @param {object} [options] - effect options
     * @param {number[]} [options.color=[1.0, 1.0, 1.0]] - outline color as [r, g, b] (0.0–1.0)
     * @param {number} [options.width=1.0] - outline width in pixels
     * @param {number[]} [options.textureSize] - texture dimensions [width, height] (defaults to renderer size)
     */
    constructor(renderer: import("../webgl_renderer.js").default, options?: {
        color?: number[] | undefined;
        width?: number | undefined;
        textureSize?: number[] | undefined;
    });
    /**
     * set the outline color
     * @param {number[]} color - outline color as [r, g, b] (0.0–1.0)
     */
    setColor(color: number[]): void;
    /**
     * set the outline width
     * @param {number} width - outline width in pixels
     */
    setWidth(width: number): void;
    /**
     * set the texture size for accurate outline width calculation
     * @param {number} width - texture width in pixels
     * @param {number} height - texture height in pixels
     */
    setTextureSize(width: number, height: number): void;
}
import ShaderEffect from "../shadereffect.js";
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