diff --git a/.eslintrc.json b/.eslintrc.json
index 1b583b7..c9940fe 100644
--- a/.eslintrc.json
+++ b/.eslintrc.json
@@ -35,6 +35,9 @@
         "allow": ["arrowFunctions"]
       }
     ],
+    "@typescript-eslint/ban-ts-comment": [
+      "off"
+    ],
     "sort-imports-es6-autofix/sort-imports-es6": [
       2
     ],
diff --git a/src/elements/QRScanner.js b/src/elements/QRScanner.ts
similarity index 66%
rename from src/elements/QRScanner.js
rename to src/elements/QRScanner.ts
index a3b8afb..8ca6b84 100644
--- a/src/elements/QRScanner.js
+++ b/src/elements/QRScanner.ts
@@ -2,30 +2,35 @@ import { Margin } from "./Margin";
 import { makeElement } from "../htmlUtils";
 import QrScanner from 'qr-scanner';
 
-/* eslint-disable import/no-unresolved */ 
+/* eslint-disable import/no-unresolved */
+// @ts-ignore
 import qrScannerWorkerSource from '!!raw-loader!qr-scanner/qr-scanner-worker.min.js';
 QrScanner.WORKER_PATH = URL.createObjectURL(new Blob([qrScannerWorkerSource]));
 
-export async function QRScanner(onScan) {
-  let webcamVideo = makeElement({
-    tag: "video"
-  })
+interface QRScannerType extends HTMLElement {
+  deinit(): void;
+}
 
-  let QRInput = makeElement({
+export async function QRScanner(onScan: (code: string) => void): Promise<QRScannerType>  {
+  const webcamVideo = makeElement({
+    tag: "video"
+  }) as HTMLVideoElement;
+
+  const QRInput = makeElement({
     tag: "div",
     children: [
       Margin(webcamVideo),
     ]
-  });
+  }) as QRScannerType;
 
-  let stream = await navigator.mediaDevices.getUserMedia({
+  const stream = await navigator.mediaDevices.getUserMedia({
     video: {
       facingMode: 'environment',
     },
     audio: false,
   });
   webcamVideo.srcObject = stream;
-  let lastSeenValue = "";
+  const lastSeenValue = "";
   const qrScanner = new QrScanner(webcamVideo, function (value) {
     if (lastSeenValue == value) return;
     onScan(value);
diff --git a/src/pages/Unseal.js b/src/pages/Unseal.js
index b9d71d5..c3c609e 100644
--- a/src/pages/Unseal.js
+++ b/src/pages/Unseal.js
@@ -1,6 +1,6 @@
 import { MarginInline } from "../elements/MarginInline";
 import { Page } from "../types/Page";
-import { QRScanner } from "../elements/QRScanner.js";
+import { QRScanner } from "../elements/QRScanner";
 import { changePage, setErrorText, setPageContent } from "../pageUtils";
 import { getSealStatus } from "../api/getSealStatus";
 import { makeElement } from "../htmlUtils";