Recreate Delete key functionality

As I can tell it's not possible to just assign delete keycode to another key, so I tried to recreate its functionality, but I can't figure out how to do it properly.

I tried to do it with slice, and it actually does what it should for the first time, but then any key I press triggers delete.

    window.addEventListener("keydown", function(e) {
        let formuleInput = $(".mat-input-element");
        if ($(formuleInput).is(':focus')) {
            formuleInput[0].addEventListener('keyup', function(f) {
                let caretPos = f.target.selectionStart;
                console.log(caretPos);
                let fInput = formuleInput[0].value;
                if (e.keyCode === 32 && $(formuleInput).is(':focus')) {
                    e.preventDefault();
                    fInput = fInput.slice(0, caretPos) + fInput.slice(caretPos + 1);
                    formuleInput[0].value = fInput;
                }
            })
        }})

<script src="https://cdnjs.cloudflare.com/ajax/libs/jquery/3.3.1/jquery.min.js"></script>
<input type="text" class="mat-input-element">

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