import { ImageDataLike, WasmSource } from "./common.js";
export declare enum UVMode {
    UVAdapt = 0,
    UV420 = 1,
    UV444 = 2,
    UVAuto = 3
}
export declare enum Csp {
    YCoCg = 0,
    YCbCr = 1,
    Custom = 2,
    YIQ = 3
}
export interface Options {
    /**
     * Range: [0 = smallest file, 100 = lossless], float type.
     * Quality 100 is strictly lossless.
     * Quality above 95 (exclusive) is near lossless.
     * Quality in [0-95] range will use lossy compression.
     *
     * @default 75.0
     */
    quality?: number;
    /**
     * Same as `quality` but for alpha channel.
     *
     * @default 100.0
     */
    alphaQuality?: number;
    /**
     * Compression rate/speed trade-off. [0=faster-bigger .. 9=slower-better]
     *
     * @default 5
     */
    effort?: number;
    /**
     * Number of entropy-analysis passes. Range: [1..10]
     *
     * @default 1
     */
    pass?: number;
    /**
     * Spatial noise shaping strength in [0(=off), 100], float type.
     *
     * Affects how we spread noise between 'risky' areas (where noise is easily visible)
     * and easier areas (where it's less visible).
     *
     * A high SNS value leads to skewing noise more towards areas where it
     * should be less visible. In general this improves SSIM but worsens PSNR.
     *
     * @default 50.0
     */
    sns?: number;
    uvMode?: UVMode;
    cspType?: Csp;
    /**
     * error diffusion strength [0=off, 100=max]
     *
     * @default 0
     */
    errorDiffusion?: number;
    useRandomMatrix?: boolean;
}
export declare const defaultOptions: Required<Options>;
export declare const bitDepth: number[];
export declare const mimeType = "image/webp2";
export declare const extension = "wp2";
export declare function loadEncoder(input?: WasmSource): Promise<any>;
export declare function loadDecoder(input?: WasmSource): Promise<any>;
export declare function encode(image: ImageDataLike, options?: Options): Uint8Array;
export declare function decode(input: BufferSource): ImageData;