There is no one file you can include like that, if you have imported through Angular CLI. You would need to add files separately like this:
This is my Angular CLI file where I am just using only a few of them.
"scripts": [
"../node_modules/jquery/dist/jquery.min.js",
"../node_modules/popper.js/dist/umd/popper.min.js",
"../node_modules/bootstrap/dist/js/bootstrap.min.js",
"../node_modules/metismenu/dist/metisMenu.min.js",
"../node_modules/jquery-slimscroll/jquery.slimscroll.min.js",
"../node_modules/jquery-ui/ui/widget.js",
"../node_modules/jquery-ui/ui/widgets/datepicker.js",
"../node_modules/jquery-ui-timepicker-addon/dist/jquery-ui-timepicker-addon.js"
],
BTW, .toggle is a function of jquery, jquery-ui just uses that.
Alternatively, you can simply link the CDN resource in the head of your index.html file in src directory. Although not recommended this method works well with Angular.
<script src="//code.jquery.com/ui/1.12.1/jquery-ui.js"></script>
If you want to choose which modules to keep you can visit http://jqueryui.com/download/ and select them one by one.