import { Merged, ValueOf } from "./types";
import { CONTENT_TYPE, OBJECT_FIT } from "./const/options";
export declare function getElement(el: HTMLElement | string | null): HTMLElement | null;
export declare const getCanvas: (el: HTMLElement | string) => HTMLCanvasElement;
export declare const getWebGLContext: (canvas: HTMLCanvasElement) => WebGLRenderingContext;
export declare const merge: <From extends {
    [key: string]: any;
}, To extends {
    [key: string]: any;
}>(target: From, ...sources: To[]) => Merged<From, To>;
export declare const clamp: (x: number, min: number, max: number) => number;
export declare const getSubImage: (contentSize: {
    width: number;
    height: number;
}, renderingSize: {
    width: number;
    height: number;
}, objectFit: ValueOf<typeof OBJECT_FIT>, contentType: ValueOf<typeof CONTENT_TYPE>) => {
    x: number;
    y: number;
    width: number;
    height: number;
};
export declare const parsePadding: (padding: number | number[]) => number[];