If you're using a build process to manage compilation of multiple javascript files on WordPress and getting errors from jetpack's sharing JS because jQuery isn't ready yet, you can use the following to wrap it in a handler which only inits after the DOM is ready

wrap_jetpack_sharing.php

add_action('wp_footer', 'wrap_jetpack_sharing', 18);
function wrap_jetpack_sharing() {
    global $wp_scripts;
    $a = $wp_scripts->get_data('sharing-js','after');
    
    $data = 'document.addEventListener( "DOMContentLoaded", function() { ';
    $data .= implode("\n", $a);
    $data .= ' }, false );';
    
    $script[] = $data;
    
    $wp_scripts->add_data('sharing-js', 'after', $script);
}