Is there a way to override any of /js/*.js files?

I know there are the ways to override module's js/css/tpl and other files, but I cant find a way to override, for example, the `/js/validate.js` file.
I've tried to place my own file to `/themes/my-theme/js` folder, but I cant see a result (validate.js is still loaded from `/js/` folder).

Is there a way to do this?

<!-- language-all: lang-php -->

There is no built-in functionality to do this.

But you can override the method `addMedia` of `FrontController`.

Create this file `/override/classes/controller/FrontController.php`:

<?php
class FrontController extends FrontControllerCore
{
/**
* Adds a media file(s) (CSS, JS) to page header
*
* @param string|array $media_uri Path to file, or an array of paths like: array(array(uri => media_type), ...)
* @param string|null $css_media_type CSS media type
* @param int|null $offset
* @param bool $remove If True, removes media files
* @param bool $check_path If true, checks if files exists
* @return true|void
*/
public function addMedia($media_uri, $css_media_type = null, $offset = null, $remove = false, $check_path = true)
{
if (!is_array($media_uri)) {
if ($css_media_type) {
$media_uri = array($media_uri => $css_media_type);
} else {
$media_uri = array($media_uri);
}
}

$list_uri = array();
foreach ($media_uri as $file => $media) {
if (!Validate::isAbsoluteUrl($media)) {
$different = 0;
$different_css = 0;
$type = 'css';
if (!$css_media_type) {
$type = 'js';
$file = $media;
}
if (strpos($file, __PS_BASE_URI__.'modules/') === 0) {
$override_path = str_replace(__PS_BASE_URI__.'modules/', _PS_ROOT_DIR_.'/themes/'._THEME_NAME_.'/'.$type.'/modules/', $file, $different);
if (strrpos($override_path, $type.'/'.basename($file)) !== false) {
$override_path_css = str_replace($type.'/'.basename($file), basename($file), $override_path, $different_css);
}

if ($different && @filemtime($override_path)) {
$file = str_replace(__PS_BASE_URI__.'modules/', __PS_BASE_URI__.'themes/'._THEME_NAME_.'/'.$type.'/modules/', $file, $different);
} elseif ($different_css && @filemtime($override_path_css)) {
$file = $override_path_css;
}
if ($css_media_type) {
$list_uri[$file] = $media;
} else {
$list_uri[] = $file;
}
// Here we add our test to override default js files
} elseif (strpos($file, _PS_JS_DIR_) === 0) {
$override_path = str_replace(_PS_JS_DIR_, _PS_ROOT_DIR_.'/themes/'._THEME_NAME_.'/js/default/', $file, $different);
if (strrpos($override_path, $type.'/'.basename($file)) !== false) {
$override_path_css = str_replace($type.'/'.basename($file), basename($file), $override_path, $different_css);
}

if ($different && @filemtime($override_path)) {
$file = str_replace(_PS_JS_DIR_, __PS_BASE_URI__.'themes/'._THEME_NAME_.'/js/default/', $file, $different);
} elseif ($different_css && @filemtime($override_path_css)) {
$file = $override_path_css;
}
if ($css_media_type) {
$list_uri[$file] = $media;
} else {
$list_uri[] = $file;
}
} else {
$list_uri[$file] = $media;
}
} else {
$list_uri[$file] = $media;
}
}

if ($remove) {
if ($css_media_type) {
return parent::removeCSS($list_uri, $css_media_type);
}
return parent::removeJS($list_uri);
}

if ($css_media_type) {
return parent::addCSS($list_uri, $css_media_type, $offset, $check_path);
}

return parent::addJS($list_uri, $check_path);
}
}

With this override, you can now create a file `/themes/my_theme/js/default/validate.js` to override the default `/js/validate.js` file.

PS: as with any override, you will have to delete the file `/cache/class_index.php`.