three.js/src/scenes/Fog.d.ts

import { Color } from './../math/Color';

export interface IFog {
	name: string;
	color: Color;
	clone(): this;
	toJSON(): any;
}

/**
 * This class contains the parameters that define linear fog, i.e., that grows linearly denser with the distance.
 */
export class Fog implements IFog {

	constructor( color: Color | number | string, near?: number, far?: number );

	/**
	 * @default ''
	 */
	name: string;

	/**
	 * Fog color.
	 */
	color: Color;

	/**
	 * The minimum distance to start applying fog. Objects that are less than 'near' units from the active camera won't be affected by fog.
	 * @default 1
	 */
	near: number;

	/**
	 * The maximum distance at which fog stops being calculated and applied. Objects that are more than 'far' units away from the active camera won't be affected by fog.
	 * @default 1000
	 */
	far: number;

	readonly isFog: true;

	clone(): this;
	toJSON(): any;

}