export interface ImageDownscaleOptions {
    enabled: boolean;
    thresholdEdge: number;
    thresholdPixels: number;
    maxEdge: number;
    maxPixels: number;
    quality: number;
}
export interface ImageSize {
    width: number;
    height: number;
}
export interface DecodedImage extends ImageSize {
    source: unknown;
}
export interface ImageDownscaleDeps {
    decode: (file: File) => Promise<DecodedImage | undefined>;
    encode: (image: DecodedImage, size: ImageSize, type: string, quality: number) => Promise<Blob | undefined>;
    release: (image: DecodedImage) => void;
    readHeader: (file: File, byteLength: number) => Promise<Uint8Array>;
}
export declare function resolveImageDownscaleOptions(...overrides: (Partial<ImageDownscaleOptions> | undefined)[]): ImageDownscaleOptions;
export declare function isDownscalableImageType(type: string | undefined): boolean;
export declare function isAnimatedWebpHeader(bytes: Uint8Array): boolean;
export declare function getDownscaleTarget(size: ImageSize, options: ImageDownscaleOptions): ImageSize | undefined;
export declare function downscaleImageFile(file: File, options: ImageDownscaleOptions, deps: ImageDownscaleDeps): Promise<File>;
export declare function createBrowserImageDownscaleDeps(): ImageDownscaleDeps;