$.extend is not a function while mixing js

I am trying to mix js files. I encountered several errors.

After research and many tests, my webpack.mix.js file is


const mix = require('laravel-mix');
require('laravel-mix-sri');
mix.webpackConfig(
	webpack => {
	    return {
			externals: {
				jquery: "'jquery'",
			}
	   }
});
mix.js('public/js/commun/jquery.js', 'public/js/commun/jquery.js')
	.js('public/js/commun/jquery.validate.js', 'public/js/commun/jquery.validate.js');

No more errors when compiling.

But in browser I have multiple $.extend is not a function.

The jquery.validate.js file begins, after mix, like this


/******/ (() => { // webpackBootstrap
/******/ 	var __webpack_modules__ = ({

/***/ "./public/js/commun/jquery.validate.js":
/*!*********************************************!*\
  !*** ./public/js/commun/jquery.validate.js ***!
  \*********************************************/
/***/ ((module, exports, __webpack_require__) => {

var __WEBPACK_AMD_DEFINE_FACTORY__, __WEBPACK_AMD_DEFINE_ARRAY__, __WEBPACK_AMD_DEFINE_RESULT__;function _typeof(obj) { "@babel/helpers - typeof"; return _typeof = "function" == typeof Symbol && "symbol" == typeof Symbol.iterator ? function (obj) { return typeof obj; } : function (obj) { return obj && "function" == typeof Symbol && obj.constructor === Symbol && obj !== Symbol.prototype ? "symbol" : typeof obj; }, _typeof(obj); }

/*!
 * jQuery Validation Plugin v1.19.2
 *
 * https://jqueryvalidation.org/
 *
 * Copyright (c) 2020 Jörn Zaefferer
 * Released under the MIT license
 */
(function (factory) {
  if (true) {
	!(__WEBPACK_AMD_DEFINE_ARRAY__ = [__webpack_require__(/*! jquery */ "jquery")], __WEBPACK_AMD_DEFINE_FACTORY__ = (factory),
		__WEBPACK_AMD_DEFINE_RESULT__ = (typeof __WEBPACK_AMD_DEFINE_FACTORY__ === 'function' ?
		(__WEBPACK_AMD_DEFINE_FACTORY__.apply(exports, __WEBPACK_AMD_DEFINE_ARRAY__)) : __WEBPACK_AMD_DEFINE_FACTORY__),
		__WEBPACK_AMD_DEFINE_RESULT__ !== undefined && (module.exports = __WEBPACK_AMD_DEFINE_RESULT__));
  } else {}
})(function ($) {
  $.extend($.fn, {	  	  	  <== here is the error

I do not know what to do

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