/**
 * 获取图片的base64 url
 * @param url - 图片url
 * @returns Promise解析后的图片base64信息
 * @example
 *
 * getImgBase64('https://example.com/image.png')
 * .then(base64 => console.log(base64))
 * .catch(err => console.error(err));
 *
 * @example
 * async function example() {
 *   try {
 *     const base64 = await getImgBase64('https://example.com/image.png');
 *     console.log(base64);
 *   } catch (err) {
 *     console.error(err);
 *   }
 * }
 */
export declare function getImgBase64(url: string): Promise<string>;