Debuging ajax call on WordPress

ajax-action.php

<?php 

add_action( "wp_ajax_stock_form", function() {
    if ( !isset( $_POST['data'] ) ) {
        wp_send_json_error( ['msg' => 'Wrong data'] );
    }

    $args = [];
    wp_parse_str( $_POST['data'], $args );

    $id = $_POST['warehouse_id'];
    
    file_put_contents( __DIR__ . "/debug.txt", print_r( $args, 1 ) );

    wp_send_json_success( $data );
} );

script.js

;(function($) {

    $('#stockForm').on("submit", function(e) {
        e.preventDefault();

        // console.log( $(this).data("warehouse-id") );

        $.post(
            wc_add_to_cart_params.ajax_url,
            {
            action: "stock_form",
            data: $(this).serialize(),
            warehouse_id: $(this).data("warehouse-id"),
            }
        ).done(function(res) {
            console.log(res);
        });
    });

})(jQuery);