export declare const PROTOCOL_REGEX: RegExp;
export declare function isBase64Image(src: string): boolean;
export declare function dataURIToBlob(dataURI: string): Blob;
export declare function convertUrlToAbsolute(url: string): string;
export declare function createWebGLContext(canvas: HTMLCanvasElement | OffscreenCanvas, forceWebGL2?: boolean): WebGLRenderingContext;