denfield-webp-hero/dist/detect-webp-support.js

webp image format polyfill for browsers

export async function detectWebpSupport() {
    const testImageSources = [
        "data:image/webp;base64,UklGRjIAAABXRUJQVlA4ICYAAACyAgCdASoCAAEALmk0mk0iIiIiIgBoSygABc6zbAAA/v56QAAAAA==",
        "data:image/webp;base64,UklGRh4AAABXRUJQVlA4TBEAAAAvAQAAAAfQ//73v/+BiOh/AAA="
    ];
    const testImage = (src) => {
        return new Promise((resolve, reject) => {
            var img = document.createElement("img");
            img.onerror = error => resolve(false);
            img.onload = () => resolve(true);
            img.src = src;
        });
    };
    const results = await Promise.all(testImageSources.map(testImage));
    return results.every(result => !!result);
}
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