export interface Options {
    width?: number;
    height?: number;
    filter?: 'sepia' | 'greyscale' | 'sharpen' | 'blur' | 'negative' | 'edge' | 'gauss';
    square?: number;
    gravity?: 'north' | 'south' | 'east' | 'center' | 'west' | 'northeast' | 'southeast' | 'southwest' | 'face';
    crop?: 'fill' | 'fit' | 'pad' | 'scale' | 'cut' | 'face';
    left?: number;
    top?: number;
    rotate?: 90 | 180 | 270;
    border?: number;
    backgroundColor?: string;
    quality?: number;
    upscale?: boolean;
    format?: 'jpg' | 'jpeg' | 'webp' | 'png' | 'tiff';
}
export declare const serializeOptions: (options?: Options) => string;