const isImageFile = (name: string) => {
    const index = name.lastIndexOf('.');
    if (index === -1) {
        return false;
    }
    const ext = name.substr(index);
    return /.(gif|jpe?g|png)$/i.test(ext);
};

const formatSize = (bytes: number, decimals = 2) => {
    if (bytes === 0) {
        return '0 B';
    }
    const k = 1024;
    const dm = decimals < 0 ? 0 : decimals;
    const sizes = ['B', 'K', 'M', 'G', 'T', 'P', 'E', 'Z', 'Y'];
    const i = Math.floor(Math.log(bytes) / Math.log(k));
    return parseFloat((bytes / Math.pow(k, i)).toFixed(dm)) + ' ' + sizes[i];
};

export { isImageFile, formatSize };