uwuifyer

The ultimate brute-force script to change your text everywhere without freezing.
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// ==UserScript==
// @name         uwuifyer
// @namespace    http://tampermonkey.net
// @version      1.6
// @description  The ultimate brute-force script to change your text everywhere without freezing.
// @author       You
// @license      MIT
// @match        *://*/*
// @include      *
// @grant        none
// @run-at       document-end
// ==/UserScript==

(function() {
    'use strict';

    function uwuify(text) {
        return text
            .replace(/[lr]/g, 'w')
            .replace(/[LR]/g, 'W')
            .replace(/n([aeiou])/g, 'ny$1')
            .replace(/N([aeiou])/g, 'Ny$1')
            .replace(/N([AEIOU])/g, 'NY$1')
            .replace(/ove/g, 'uv');
    }

    function processInput(target) {
        if (target.dataset.isUwUing) return;

        const isStandardInput = target.tagName === 'INPUT' || target.tagName === 'TEXTAREA';
        const isContentEditable = target.getAttribute('contenteditable') === 'true';

        if (isStandardInput) {
            const original = target.value || "";
            const converted = uwuify(original);
            if (original !== converted) {
                target.dataset.isUwUing = 'true';
                const start = target.selectionStart;
                const end = target.selectionEnd;
                target.value = converted;
                target.setSelectionRange(start, end);
                delete target.dataset.isUwUing;
            }
        } else if (isContentEditable) {
            const selection = window.getSelection();
            if (!selection.rangeCount) return;
            const range = selection.getRangeAt(0);
            const textNode = range.startContainer;

            if (textNode.nodeType === Node.TEXT_NODE) {
                const original = textNode.textContent || "";
                const converted = uwuify(original);
                if (original !== converted) {
                    target.dataset.isUwUing = 'true';
                    const offset = range.startOffset;
                    textNode.textContent = converted;
                    
                    try {
                        const newRange = document.createRange();
                        newRange.setStart(textNode, offset);
                        newRange.collapse(true);
                        selection.removeAllRanges();
                        selection.addRange(newRange);
                    } catch (err) {}
                    delete target.dataset.isUwUing;
                }
            }
        }
    }

    // Listens globally to all character keystroke changes safely
    document.addEventListener('input', function(e) {
        if (e.target) processInput(e.target);
    }, true);
})();