Laravel mix issue: datepicker does not work

The datepicker works on my bootstrap folder. However, when I move everything into laravel, it does not work. I don’t really understand that how css and js work in laravel, so that is why I am here :).

/resources/sass/app.scss

//css
@import url('https://cdnjs.cloudflare.com/ajax/libs/bootstrap-datepicker/1.9.0/css/bootstrap-datepicker.min.css');
@import url('https://cdnjs.cloudflare.com/ajax/libs/font-awesome/4.7.0/css/font-awesome.min.css');

//js
@import url('https://ajax.googleapis.com/ajax/libs/jquery/3.4.1/jquery.min.js');
@import url('https://cdn.jsdelivr.net/npm/[email protected]/dist/js/bootstrap.bundle.min.js');
@import url('https://cdnjs.cloudflare.com/ajax/libs/bootstrap-datepicker/1.9.0/js/bootstrap-datepicker.min.js');

              <!--DatePicker-->
              <div class="col-md-4">
                <h4 class="">Prefer Date</h3>
                <form>
                    <div class="">
                        <!-- <label for="date" class="col-sm-1 col-form-label">Date</label> -->
                        <div class="">
                            <div class="input-group date" id="datepicker">
                                <input type="text" class="form-control">
                                <span class="input-group-append">
                                    <span class="input-group-text bg-white">
                                        <i class="fa fa-calendar"></i>
                                    </span>
                                </span>
                            </div>
                        </div>
                    </div>
                </form>
              </div>
              <script type="text/javascript">
                $(function() {
                    $('#datepicker').datepicker();
              });
              </script>