ether.js v6 migration

.eslintrc.json

@@ -1,11 +1,8 @@
 {
-  "extends": [
-    "eslint:recommended",
-    "prettier"
-  ],
+  "extends": ["eslint:recommended", "prettier"],
   "env": {
     "node": true,
-    "es6": true,
+    "es2020": true,
     "commonjs": true,
     "mocha": true
   },
@@ -17,7 +14,8 @@
     "no-empty": "off",
     "no-only-tests/no-only-tests": "error"
   },
-  "plugins": [
-    "no-only-tests"
-  ]
+  "plugins": ["no-only-tests"],
+  "globals": {
+    "BigInt": true
+  }
 }

contracts/protocol/clients/voucher/BosonVoucher.sol

@@ -1,5 +1,6 @@
 // SPDX-License-Identifier: GPL-3.0-or-later
 pragma solidity 0.8.18;
+
 import "../../../domain/BosonConstants.sol";
 import { ERC721Upgradeable } from "@openzeppelin/contracts-upgradeable/token/ERC721/ERC721Upgradeable.sol";
 import { IERC721Upgradeable } from "@openzeppelin/contracts-upgradeable/token/ERC721/IERC721Upgradeable.sol";
@@ -296,11 +297,6 @@ contract BosonVoucherBase is IBosonVoucher, BeaconClientBase, OwnableUpgradeable
         // End should be greater than start
         require(end > start, NOTHING_TO_BURN);
 
-        // If amount to burn is more than maxPremintedVouchers, burn only maxPremintedVouchers
-        if (end > start + maxPremintedVouchers) {
-            end = start + maxPremintedVouchers;
-        }
-
         // Burn the range
         address rangeOwner = range.owner;
         uint256 burned;