import type { Document } from '@gltf-transform/core';
export type Ktx2Mode = 'etc1s' | 'uastc';
export interface Ktx2Result {
    encoder: 'basis-wasm';
    mode: Ktx2Mode;
    encoded: {
        name: string;
        before: number;
        after: number;
    }[];
}
/**
 * Encodes the document's color textures to KTX2 / Basis (KHR_texture_basisu) via the BasisU WASM
 * encoder — GPU-compressed in VRAM (ETC1S ~6–8×, UASTC ~4×) and transcoded once at load by the
 * client's KTX2Loader. Run on the FINAL merged web GLB. The import pipeline carries a single baked
 * base-color atlas, so every remaining texture is an sRGB color/albedo map. Textures already in
 * image/ktx2 are skipped (idempotent).
 */
export declare function encodeKtx2(document: Document, opts?: {
    mode?: Ktx2Mode;
    quality?: number;
}): Promise<Ktx2Result>;