import { ImageDataLike, WasmSource } from "./common.js";
export declare const Presets: readonly ["ultrafast", "superfast", "veryfast", "faster", "fast", "medium", "slow", "slower", "veryslow", "placebo"];
export declare const Subsampling: readonly ["420", "422", "444"];
export declare const Tune: readonly ["psnr", "ssim", "grain", "fastdecode"];
export interface Options {
    /**
     * Quality-based VBR [0, 100], it will map to `--crf` parameter of x265.
     * quality=0   -> crf=50
     * quality=50  -> crf=25
     * quality=100 -> crf=0
     *
     * @default 50
     */
    quality?: number;
    /**
     * If true, Bypass transform, quant and loop filters.
     *
     * Note: it does not bypass chroma subsampling, you need
     *       also to set `chroma` to "444" for exact lossless.
     *
     * @default false
     */
    lossless?: boolean;
    /**
     * Trade off performance for compression efficiency.
     *
     * @default "slow"
     */
    preset?: typeof Presets[number];
    /**
     * Tune the settings for a particular type of source or situation.
     *
     * @default "ssim"
     */
    tune?: typeof Tune[number];
    /**
     * Max TU recursive depth for intra CUs。
     *
     * [1, 4], default 2.
     */
    tuIntraDepth?: number;
    /**
     * CPU effort, larger value increases encode time.
     * Range is [0, 100], but only changes at a few values.
     *
     * @default 50
     */
    complexity?: number;
    /**
     * Specify chroma subsampling method.
     *
     * @default "420"
     */
    chroma?: typeof Subsampling[number];
    /**
     * Use more accurate and sharper RGB->YUV conversion if needed.
     *
     * @default false
     */
    sharpYUV?: boolean;
}
export declare const defaultOptions: Required<Options>;
export declare const mimeType = "image/heic";
export declare const extension = "heic";
export declare const bitDepth: number[];
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;