JSFiddle - React, Tailwind, and code Playground

HTML

<div class="filterFeedItem" data-component-type="#somefilter">

</div>

JavaScript

var $container = $("body");
    
    var $existingFilter1 = $container.find('.filterFeedItem[data-component-type=\\#somefilter]');
    
    var $existingFilter2 = $container.find('.filterFeedItem[data-component-type="#somefilter"]');
    
    var $existingFilter3 = $container.find('.filterFeedItem[data-component-type=' +$.escapeSelector('#somefilter') +']');

console.log("$existingFilter1:", $existingFilter1
           , "$existingFilter2:", $existingFilter2
           , "$existingFilter3:", $existingFilter3);