Correct Qr signature type (#537)

package.json

@@ -34,8 +34,8 @@
   "devDependencies": {
     "@babel/core": "^7.15.8",
     "@babel/runtime": "^7.15.4",
-    "@polkadot/dev": "^0.63.18",
-    "@polkadot/ts": "^0.4.12",
+    "@polkadot/dev": "^0.63.22",
+    "@polkadot/ts": "^0.4.13",
     "@polkadot/x-bundle": "^7.7.1",
     "@types/jest": "^27.0.2",
     "babel-plugin-transform-vue-template": "^0.4.2",

packages/react-qr/src/ScanSignature.tsx

@@ -1,12 +1,14 @@
 // Copyright 2017-2021 @polkadot/react-qr authors & contributors
 // SPDX-License-Identifier: Apache-2.0
 
+import type { HexString } from '@polkadot/util/types';
+
 import React, { useCallback } from 'react';
 
 import { QrScan } from './Scan';
 
 interface ScanType {
-  signature: string;
+  signature: HexString;
 }
 
 interface Props {