import { Document, ILogger, vec2, Texture } from '@gltf-transform/core';
import { ETC1SOptions, UASTCOptions } from './toktx_types.js';
export declare const KTX_SOFTWARE_VERSION_MIN = "4.3.0";
export declare const Filter: {
    BOX: string;
    TENT: string;
    BELL: string;
    BSPLINE: string;
    MITCHELL: string;
    LANCZOS3: string;
    LANCZOS4: string;
    LANCZOS6: string;
    LANCZOS12: string;
    BLACKMAN: string;
    KAISER: string;
    GAUSSIAN: string;
    CATMULLROM: string;
    QUADRATIC_INTERP: string;
    QUADRATIC_APPROX: string;
    QUADRATIC_MIX: string;
};
/**********************************************************************************************
 * Interfaces.
 */
export declare const Mode: {
    ETC1S: string;
    UASTC: string;
};
export type TextureModeArgs = {
    doc: Document;
    texture: Texture;
    index: number;
    options: ETC1SOptions | UASTCOptions;
};
export type TextureParamsArgs = {
    doc: Document;
    texture: Texture;
    index: number;
    params: Array<string | number>;
};
export interface ToktxOptions {
    toktxPath?: string;
    /** return false if texture should not be compressed */
    modifyOptions?: (args: TextureModeArgs) => void | boolean;
    modifyParams?: (args: TextureParamsArgs) => void;
}
/**********************************************************************************************
 * Utilities.
 */
/** Create CLI parameters from the given options. Attempts to write only non-default options. */
export declare function createParams(texture: Texture, slots: string[], channels: number, size: vec2, logger: ILogger, numTextures: number, options: ETC1SOptions | UASTCOptions): (string | number)[];
export declare function checkKTXSoftware(logger: ILogger, env?: any): Promise<string | null>;