[tempermonkey][userscript] paste to preview image on google images

gistfile1.txt

// ==UserScript==
// @name         Search Image from clipboard
// @namespace    https://github.com/tnifey
// @version      0.1
// @description  Google Images - Search By Paste Image from clipboard
// @author       Tnifey
// @match        https://images.google.com/*
// @match        https://google.com/imghp
// @match        https://google.com/imghp*
// @grant        none
// ==/UserScript==

(function() {
    'use strict';

    window.addEventListener("paste", (ev) => {
        searchFromClipboard(ev);
    });

    let preview = null;

    async function searchFromClipboard(ev) {
        console.log('file');
        const preview = getPreview();

        const dT = ev.clipboardData || window.clipboardData;
        const file = dT.files[0];

        console.log("search by paste", file);

        if(file) {
            const url = URL.createObjectURL(file);
            console.log("file");
            preview.addEventListener('load', (ev) => {
                URL.revokeObjectURL(url);
            }, { once: true });
            preview.src = url;
        }

        else {
            if(preview) {
                preview.remove();
                preview = null;
            }
        }
    }

    function getPreview() {
        if(!preview) {
            preview = document.createElement("img");
            preview.classList.add("preview");
            preview.style.width = '200px';
            preview.style.height = '200px';
            preview.style.border = "none";
            preview.style.position = 'fixed';
            preview.style.objectFit = 'contain';
            preview.style.backgroundColor = 'tomato';
            preview.style.bottom = '2rem';
            preview.style.right = '2rem';
            preview.style.zIndex = '9001';

            document.body.append(preview);
        }

        return preview;
    }
})();