Switching "this" keyword from jQuery to TypeScript

A piece of code is functioning properly for me.

Now, I aim to incorporate this code into a TypeScript application. While I prefer to continue using jQuery, I am unsure how to adjust the use of this to meet TypeScript requirements.

if ($(this).width() < 769) {
    $('body').addClass('page-small');
} else {
    $('body').removeClass('page-small');
    $('body').removeClass('show-sidebar');
}

In TypeScript, this corresponds to the current class. What should I substitute it with for the expected functionality?

jquerytypescripttypescript1.8

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