[template_directory] shortcode allows use of get_template_directory_uri() function in TinyMCE editor WordPress

get template directory uri shortcode

/**
 * Shortcode for WP function get_template_directory_uri();
 */
// Add Shortcode
function bfp_get_template_directory() {

    $directory = get_template_directory_uri();
    // Code
    return $directory;
}
add_shortcode( 'template_directory', 'bfp_get_template_directory' );