remove legacy polyfills and unused dependencies

package.json

@@ -55,7 +55,6 @@
   "dependencies": {
     "@babel/runtime": "^7.12.5",
     "await-lock": "^2.1.0",
-    "blueimp-canvas-to-blob": "^3.28.0",
     "browser-encrypt-attachment": "^0.3.0",
     "browser-request": "^0.3.3",
     "cheerio": "^1.0.0-rc.9",
@@ -88,7 +87,6 @@
     "png-chunks-extract": "^1.0.0",
     "prop-types": "^15.7.2",
     "qrcode": "^1.4.4",
-    "qs": "^6.9.6",
     "re-resizable": "^6.9.0",
     "react": "^17.0.2",
     "react-beautiful-dnd": "^4.0.1",
@@ -99,7 +97,6 @@
     "rfc4648": "^1.4.0",
     "sanitize-html": "^2.3.2",
     "tar-js": "^0.3.0",
-    "text-encoding-utf-8": "^1.0.2",
     "url": "^0.11.0",
     "what-input": "^5.2.10",
     "zxcvbn": "^4.4.2"

src/ContentMessages.tsx

@@ -28,8 +28,6 @@ import encrypt from "browser-encrypt-attachment";
 import extractPngChunks from "png-chunks-extract";
 import Spinner from "./components/views/elements/Spinner";
 
-// Polyfill for Canvas.toBlob API using Canvas.toDataURL
-import "blueimp-canvas-to-blob";
 import { Action } from "./dispatcher/actions";
 import CountlyAnalytics from "./CountlyAnalytics";
 import {

src/CountlyAnalytics.ts

@@ -24,13 +24,6 @@ import {sleep} from "./utils/promise";
 import RoomViewStore from "./stores/RoomViewStore";
 import { Action } from "./dispatcher/actions";
 
-// polyfill textencoder if necessary
-import * as TextEncodingUtf8 from 'text-encoding-utf-8';
-let TextEncoder = window.TextEncoder;
-if (!TextEncoder) {
-    TextEncoder = TextEncodingUtf8.TextEncoder;
-}
-
 const INACTIVITY_TIME = 20; // seconds
 const HEARTBEAT_INTERVAL = 5_000; // ms
 const SESSION_UPDATE_INTERVAL = 60; // seconds

src/rageshake/submit-rageshake.ts

@@ -25,14 +25,8 @@ import Tar from "tar-js";
 
 import * as rageshake from './rageshake';
 
-// polyfill textencoder if necessary
-import * as TextEncodingUtf8 from 'text-encoding-utf-8';
 import SettingsStore from "../settings/SettingsStore";
 import SdkConfig from "../SdkConfig";
-let TextEncoder = window.TextEncoder;
-if (!TextEncoder) {
-    TextEncoder = TextEncodingUtf8.TextEncoder;
-}
 
 interface IOpts {
     label?: string;

src/utils/MegolmExportEncryption.js

@@ -15,17 +15,6 @@ See the License for the specific language governing permissions and
 limitations under the License.
 */
 
-// polyfill textencoder if necessary
-import * as TextEncodingUtf8 from 'text-encoding-utf-8';
-let TextEncoder = window.TextEncoder;
-if (!TextEncoder) {
-    TextEncoder = TextEncodingUtf8.TextEncoder;
-}
-let TextDecoder = window.TextDecoder;
-if (!TextDecoder) {
-    TextDecoder = TextEncodingUtf8.TextDecoder;
-}
-
 import { _t } from '../languageHandler';
 import SdkConfig from '../SdkConfig';
 

yarn.lock

@@ -2181,11 +2181,6 @@ bluebird@^3.5.0:
   resolved "https://registry.yarnpkg.com/bluebird/-/bluebird-3.7.2.tgz#9f229c15be272454ffa973ace0dbee79a1b0c36f"
   integrity sha512-XpNj6GDQzdfW+r2Wnn7xiSAd7TM3jzkxGXBGTtWKuSXv1xUV+azxAm8jdWZN06QTQk+2N2XB9jRDkvbmQmcRtg==
 
-blueimp-canvas-to-blob@^3.28.0:
-  version "3.28.0"
-  resolved "https://registry.yarnpkg.com/blueimp-canvas-to-blob/-/blueimp-canvas-to-blob-3.28.0.tgz#c8ab4dc6bb08774a7f273798cdf94b0776adf6c8"
-  integrity sha512-5q+YHzgGsuHQ01iouGgJaPJXod2AzTxJXmVv90PpGrRxU7G7IqgPqWXz+PBmt3520jKKi6irWbNV87DicEa7wg==
-
 boolbase@^1.0.0:
   version "1.0.0"
   resolved "https://registry.yarnpkg.com/boolbase/-/boolbase-1.0.0.tgz#68dff5fbe60c51eb37725ea9e3ed310dcc1e776e"
@@ -7945,11 +7940,6 @@ test-exclude@^6.0.0:
     glob "^7.1.4"
     minimatch "^3.0.4"
 
-text-encoding-utf-8@^1.0.2:
-  version "1.0.2"
-  resolved "https://registry.yarnpkg.com/text-encoding-utf-8/-/text-encoding-utf-8-1.0.2.tgz#585b62197b0ae437e3c7b5d0af27ac1021e10d13"
-  integrity sha512-8bw4MY9WjdsD2aMtO0OzOCY3pXGYNx2d2FfHRVUKkiCPDWjKuOlhLVASS+pD7VkLTVjW268LYJHwsnPFlBpbAg==
-
 text-table@^0.2.0:
   version "0.2.0"
   resolved "https://registry.yarnpkg.com/text-table/-/text-table-0.2.0.tgz#7f5ee823ae805207c00af2df4a84ec3fcfa570b4"