Tistory copy without source

tistory-copy-without-source.js

// ==UserScript==
// @name         Tistory copy without source
// @version      1.0.0
// @description  remove source when copying
// @match        http://*.tistory.com/*
// @match        https://*.tistory.com/*
// @grant        none
// @run-at       document-start
// ==/UserScript==

(function () {
    'use strict';

    const nativeEventListener = document.addEventListener;

    document.addEventListener = function (...args) {
        if (args[0] === 'copy' && args[1].name === 'copyWithSource') {
            return;
        }

        nativeEventListener.apply(this, args);
    };
})();