const WEBP_TEST_IMAGES = {
    lossy: 'UklGRiIAAABXRUJQVlA4IBYAAAAwAQCdASoBAAEADsD+JaQAA3AAAAAA',
    lossless: 'UklGRhoAAABXRUJQVlA4TA0AAAAvAAAAEAcQERGIiP4HAA==',
    alpha: 'UklGRkoAAABXRUJQVlA4WAoAAAAQAAAAAAAAAAAAQUxQSAwAAAARBxAR/Q9ERP8DAABWUDggGAAAABQBAJ0BKgEAAQAAAP4AAA3AAP7mtQAAAA==',
    animation: 'UklGRlIAAABXRUJQVlA4WAoAAAASAAAAAAAAAAAAQU5JTQYAAAD/////AABBTk1GJgAAAAAAAAAAAAAAAAAAAGQAAABWUDhMDQAAAC8AAAAQBxAREYiI/gcA'
};
const WEBP_FEATURES = ['lossy', 'lossless', 'alpha', 'animation'];
/**
 * Checks if WebP is supported
 * @param features Array, can include 'lossy', 'lossless', 'alpha' or 'animation'
 */
export async function isWebPSupported(features = WEBP_FEATURES) {
    const promises = features.map((feature) => checkWebPFeature(feature));
    const statuses = await Promise.all(promises);
    return statuses.every((_) => _);
}
/**
 * Checks if a specific WebP feature is supported
 * @param feature 'feature' can be one of 'lossy', 'lossless', 'alpha' or 'animation'.
 *
 * Based on Google's official recommended checks
 * @see https://developers.google.com/speed/webp/faq#how_can_i_detect_browser_support_for_webp
 */
async function checkWebPFeature(feature) {
    if (typeof Image === 'undefined') {
        return false;
    }
    return await new Promise((resolve, reject) => {
        const img = new Image();
        img.onload = () => resolve(img.width > 0 && img.height > 0);
        img.onerror = () => resolve(false);
        img.src = `data:image/webp;base64,${WEBP_TEST_IMAGES[feature]}`;
    });
}