function myplugin_enqueue() {
        if ( ! function_exists( 'is_checkout' ) ) {
            return;
        }

        if ( ! is_checkout() ) {
            return;
        }

        wp_enqueue_script(
            'wc-city-dropdown',
            trailingslashit( plugin_dir_url( __FILE__ ) ) . 'assets/checkout.js',
            [ 'jquery' ],
            filemtime( trailingslashit( plugin_dir_path( __FILE__ ) ) . 'assets/checkout.js' ),
            true
        );

        wp_localize_script( 'wc-city-dropdown', 'wc_city_dropdown', [
           'cities' => myplugin_get_cities()
        ]);
}