js paste event

1const target = document.querySelector('div.target');
2
3target.addEventListener('paste', (event) => {
4    let paste = (event.clipboardData || window.clipboardData).getData('text');
5    paste = paste.toUpperCase();
6 
7    const selection = window.getSelection();
8    if (!selection.rangeCount) return false;
9    selection.deleteFromDocument();
10    selection.getRangeAt(0).insertNode(document.createTextNode(paste));
11
12    event.preventDefault();
13});
14