hide_show_shipping_method.liquid

<script>
const shipping_method_id = 1234556 // id of free shipping option
const normal_shipping = 654321 // id of normal shipping option
const municipalities_free_shipping = ["merchant needs to complete this field"] // Ideally a theme option separated by comma
const products_free_shipping = ["merchant needs to complete this field"] // Ideally a theme option separated by comma

var conditions = function() {
    //  certain product is in the cart and certain municipalities are selected. The work is to construct this function
}

var special_shipping = function() {
    if (conditions()) {
        $('#shipping_options input[value=' + shipping_method_id + ']').parent().show();
    } else {
        $('#shipping_options input[value=' + shipping_method_id + ']').parent().hide();
        $('#shipping_options input[value=' + normal_shipping + ']').click();
    }
}

// Execute the function
$(document).ready(special_shipping);
$(checkout).change(special_shipping);
</script>