Importing can-jquery/legacy will also bring in can-jquery, but also has the side effect of enabling jQuery wrappers being applied to places such as can-controls and on:event callbacks.

Note that simply importing can-jquery-legacy will enable this, so any can-controls expecting to receive the raw HTMLElement will break.

var $ = require("can-jquery/legacy");
var Control = require("can-control");

var MyControl = Control.extend({
    "li click": function(el){
        // `el` is jQuery wrapped!
    }
});

var dom = $("<div><ul><li>First</li><li>Second</li></ul></div>");
new MyControl(dom);

dom.find("li:first").trigger("click");