Netflix - remove hearing impaired captions from subtitles

netflix-hi-subs-removal.js

(function() {

    var targetNode = document.querySelector('.player-timedtext');

    function callback(mutationsList) {
        const e = document.querySelectorAll('.player-timedtext-text-container > *');
        if (e) {
            e.forEach(sub => {
                const before = sub.innerHTML;
                let after = before
                                .replace(/\[.*]/g, "")
                               // .replace(/^♪[.*]/g, "")
                               // .replace(/[.*]♪$/g, "")
                                .trim()
                                .replace(/^<br>/g, "")
                                .replace(/<br>$/g, "")
                                .replace(/^-$/g, "");
                if (before != after) {
                    console.log(before, " => ", after);
                    sub.innerHTML = after;
                }
            });
        }
    };

    var observer = new MutationObserver(callback);
    observer.observe(document.body, { subtree: true, attributes: false, childList: true });

})();

Thanks for this!
I also added removing parenthesis, so there's no more (train clacking in distance), (loud snap), (grunts), ♪♪, etc. in Harry Potter.