JSFiddle - React, Tailwind, and code Playground

JavaScript

( function()
{
    window.foo = function(){};
}() );

$( function()
{
    alert( typeof foo );
    $( document ).bind( 'ajaxComplete', function()
    {
        alert( typeof foo );
    } );
} );

$( function()
{
    $.ajax( {
        url: '/echo/json/',
        type: 'post',
        dataType: 'json'
    } );
} );