import type { Renderer } from 'pixi.js';
/**
 * Generates an .env file and downloads it, This only works on WebGL2 due to some of the rendering technique use.
 * Once the file is downloaded, you can load and parse it super fast.
 *
 * The env file contains the spherical harmonics and the convoluted mipmap textures.
 * The textures are stored in RGBE format. Basically the alpha channel is used to allow rgb brighter than one
 *
 * HDR files can be found here: https://hdrihaven.com/hdri/?c=outdoor&h=dikhololo_night
 *
 * compressing the data result in almost 50% files size, but does reduce the range a bit.
 *
 * @param url - the url of the hdr environment
 * @param renderer - pixi renderer to work its magic
 * @param size - size of the environment texture does not need to be too big! 256 is a good size
 * @param compress - if true, will compress the textures to PNGs rather than raw array data.
 * @param name - the name of the file that is downloaded.
 *
 * @returns - a shiny new Environment object
 */
export declare function generateEnvFile(url: string, renderer: Renderer, size?: number, compress?: boolean, name?: string): Promise<void>;
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