Upload clipboard image to imgur and paste link

clipboard_image_uploader.user.js

// ==UserScript==
// @name         kokoro.io clipboard image uploader
// @namespace    http://0xbd.cf/
// @version      0.1
// @description  Upload clipboard image to imgur and paste link
// @author       You
// @match        https://kokoro.io/
// @grant        none
// ==/UserScript==

(function() {
    'use strict';

    // Put your access key for upload with account
    // const auth = "Bearer YOUR_ACCESS_TOKEN";
    // Or client id for anonymous upload
    // const auth = "Client-ID YOUR_CLIENT_ID";

    document.addEventListener('paste', async ev => {
        const textArea = document.querySelector('#say > textarea');
        if (!textArea) return;

        const items = (ev.clipboardData || ev.originalEvent.clipboardData).items;
        for (const item of items) {
            if (item.type.indexOf("image") != -1) {
                // console.log('Clipboard has image');
                ev.preventDefault();
                const blob = item.getAsFile();

                const method = "POST";
                const headers = {
                    'Authorization': auth
                };
                const body = new FormData();
                body.append('image', blob);

                const placeholderOrig = textArea.placeholder;
                textArea.placeholder = 'Uploading...';
                textArea.disabled = true;
                try {
                    const response = await fetch("https://api.imgur.com/3/image", {method, headers, body});
                    const json = await response.json()
                    textArea.value = json.data.link;
                    // Fake event to enable send with enter key
                    textArea.dispatchEvent(new Event('input'));
                    console.dir(json);
                } catch(e) {
                    alert('Failed to upload (See the console log)');
                    console.error(e);
                }
                textArea.placeholder = placeholderOrig;
                textArea.disabled = false;
            }
        };
    });
})();

アップロード中にチャンネル切り替えたりするとどうなるかわからん