import type { Node } from "../core/Node.ts";
import type { Color } from "../math/Color.ts";
import { Vector3 } from "../math/Vector3.ts";
import { Light } from "./Light.ts";
/**
 * Per-vertex cone attenuation, CPU-computed.
 * When target is set, direction is computed as normalize(target world pos - light world pos).
 */
export declare class SpotLight extends Light {
    #private;
    type: string;
    lightType: number;
    /** Local-space cone direction. */
    direction: Vector3;
    /**
     * Optional target node. When set, overrides direction.
     * Direction becomes normalize(target.matrixWorld position - this.matrixWorld position).
     */
    target: Node | undefined;
    distance: number;
    /** Precomputed `Math.cos(angle)`. Updated whenever `angle` or `penumbra` change. */
    _cosAngle: number;
    /** Precomputed `Math.cos(angle * (1 - penumbra))`. Updated whenever `angle` or `penumbra` change. */
    _cosInnerAngle: number;
    decay: number;
    get angle(): number;
    set angle(value: number);
    get penumbra(): number;
    set penumbra(value: number);
    constructor(color?: Color | number | string, intensity?: number, distance?: number, angle?: number, penumbra?: number, decay?: number);
    copy(source: SpotLight, recursive?: boolean): this;
}
//# sourceMappingURL=SpotLight.d.ts.map