diff --git a/.eslintignore b/.eslintignore
index cbcaffc1..b5dc9cf0 100644
--- a/.eslintignore
+++ b/.eslintignore
@@ -1,6 +1,7 @@
 dist
 build
 build-cli
+coverage
 webpack.cli.js
 webpack.main.js
 webpack.renderer.js
diff --git a/jslib/common/src/misc/nodeUtils.ts b/jslib/common/src/misc/nodeUtils.ts
index 5b5ba27b..44cbec4b 100644
--- a/jslib/common/src/misc/nodeUtils.ts
+++ b/jslib/common/src/misc/nodeUtils.ts
@@ -29,6 +29,6 @@ export class NodeUtils {
 
   // https://stackoverflow.com/a/31394257
   static bufferToArrayBuffer(buf: Buffer): ArrayBuffer {
-    return buf.buffer.slice(buf.byteOffset, buf.byteOffset + buf.byteLength);
+    return buf.buffer.slice(buf.byteOffset, buf.byteOffset + buf.byteLength) as ArrayBuffer;
   }
 }
diff --git a/jslib/common/src/misc/utils.ts b/jslib/common/src/misc/utils.ts
index f65fe0d1..00aa62a1 100644
--- a/jslib/common/src/misc/utils.ts
+++ b/jslib/common/src/misc/utils.ts
@@ -1,11 +1,13 @@
 /* eslint-disable no-useless-escape */
+import url from "url";
+
 import { I18nService } from "../abstractions/i18n.service";
 
 import * as tldjs from "tldjs";
 
-const nodeURL = typeof window === "undefined" ? require("url") : null;
+const nodeURL = typeof window === "undefined" ? url : null;
 
-export class Utils {
+class Utils {
   static inited = false;
   static isNode = false;
   static isBrowser = true;
@@ -34,9 +36,11 @@ export class Utils {
     Utils.global = Utils.isNode && !Utils.isBrowser ? global : window;
   }
 
-  static fromB64ToArray(str: string): Uint8Array {
+  static fromB64ToArray(str: string): Uint8Array<ArrayBuffer> {
     if (Utils.isNode) {
-      return new Uint8Array(Buffer.from(str, "base64"));
+      const buffer = Buffer.from(str, "base64");
+
+      return new Uint8Array(buffer.buffer, buffer.byteOffset, buffer.byteLength) as Uint8Array<ArrayBuffer>;
     } else {
       const binaryString = window.atob(str);
       const bytes = new Uint8Array(binaryString.length);
@@ -47,7 +51,7 @@ export class Utils {
     }
   }
 
-  static fromUrlB64ToArray(str: string): Uint8Array {
+  static fromUrlB64ToArray(str: string): Uint8Array<ArrayBuffer> {
     return Utils.fromB64ToArray(Utils.fromUrlB64ToB64(str));
   }
 
@@ -63,9 +67,11 @@ export class Utils {
     }
   }
 
-  static fromUtf8ToArray(str: string): Uint8Array {
+  static fromUtf8ToArray(str: string): Uint8Array<ArrayBuffer> {
     if (Utils.isNode) {
-      return new Uint8Array(Buffer.from(str, "utf8"));
+      const buffer = Buffer.from(str, "utf8");
+
+      return new Uint8Array(buffer.buffer, buffer.byteOffset, buffer.byteLength) as Uint8Array<ArrayBuffer>;
     } else {
       const strUtf8 = unescape(encodeURIComponent(str));
       const arr = new Uint8Array(strUtf8.length);
@@ -84,12 +90,12 @@ export class Utils {
     return arr;
   }
 
-  static fromBufferToB64(buffer: ArrayBuffer): string {
+  static fromBufferToB64(buffer: BufferSource): string {
     if (Utils.isNode) {
-      return Buffer.from(buffer).toString("base64");
+      return Buffer.from(buffer as ArrayBuffer).toString("base64");
     } else {
       let binary = "";
-      const bytes = new Uint8Array(buffer);
+      const bytes = ArrayBuffer.isView(buffer) ? new Uint8Array(buffer.buffer, buffer.byteOffset, buffer.byteLength) : new Uint8Array(buffer);
       for (let i = 0; i < bytes.byteLength; i++) {
         binary += String.fromCharCode(bytes[i]);
       }
@@ -97,7 +103,7 @@ export class Utils {
     }
   }
 
-  static fromBufferToUrlB64(buffer: ArrayBuffer): string {
+  static fromBufferToUrlB64(buffer: BufferSource): string {
     return Utils.fromB64toUrlB64(Utils.fromBufferToB64(buffer));
   }
 
@@ -247,7 +253,7 @@ export class Utils {
         const urlDomain =
           tldjs != null && tldjs.getDomain != null ? tldjs.getDomain(url.hostname) : null;
         return urlDomain != null ? urlDomain : url.hostname;
-      } catch (e) {
+      } catch {
         // Invalid domain, try another approach below.
       }
     }
@@ -395,7 +401,7 @@ export class Utils {
         anchor.href = uriString;
         return anchor as any;
       }
-    } catch (e) {
+    } catch {
       // Ignore error
     }
 
@@ -403,4 +409,6 @@ export class Utils {
   }
 }
 
+export default Utils;
+
 Utils.init();
diff --git a/jslib/common/src/models/domain/encString.ts b/jslib/common/src/models/domain/encString.ts
index 87bd035a..13089412 100644
--- a/jslib/common/src/models/domain/encString.ts
+++ b/jslib/common/src/models/domain/encString.ts
@@ -1,6 +1,6 @@
 import { CryptoService } from "../../abstractions/crypto.service";
 import { EncryptionType } from "../../enums/encryptionType";
-import { Utils } from "../../misc/utils";
+import Utils from "../../misc/utils";
 
 import { SymmetricCryptoKey } from "./symmetricCryptoKey";
 
@@ -53,7 +53,7 @@ export class EncString {
       try {
         this.encryptionType = parseInt(headerPieces[0], null);
         encPieces = headerPieces[1].split("|");
-      } catch (e) {
+      } catch {
         return;
       }
     } else {
@@ -114,7 +114,7 @@ export class EncString {
         key = await cryptoService.getOrgKey(orgId);
       }
       this.decryptedValue = await cryptoService.decryptToUtf8(this, key);
-    } catch (e) {
+    } catch {
       this.decryptedValue = "[error: cannot decrypt]";
     }
     return this.decryptedValue;
diff --git a/jslib/common/src/models/domain/symmetricCryptoKey.ts b/jslib/common/src/models/domain/symmetricCryptoKey.ts
index a58dc6fd..c8cbfaf4 100644
--- a/jslib/common/src/models/domain/symmetricCryptoKey.ts
+++ b/jslib/common/src/models/domain/symmetricCryptoKey.ts
@@ -1,5 +1,5 @@
 import { EncryptionType } from "../../enums/encryptionType";
-import { Utils } from "../../misc/utils";
+import Utils from "../../misc/utils";
 
 export class SymmetricCryptoKey {
   key: ArrayBuffer;
@@ -13,33 +13,35 @@ export class SymmetricCryptoKey {
 
   meta: any;
 
-  constructor(key: ArrayBuffer, encType?: EncryptionType) {
+  constructor(key: BufferSource, encType?: EncryptionType) {
     if (key == null) {
       throw new Error("Must provide key");
     }
 
+    const keyBuffer = ArrayBuffer.isView(key) ? key.buffer.slice(key.byteOffset, key.byteOffset + key.byteLength) : key;
+
     if (encType == null) {
-      if (key.byteLength === 32) {
+      if (keyBuffer.byteLength === 32) {
         encType = EncryptionType.AesCbc256_B64;
-      } else if (key.byteLength === 64) {
+      } else if (keyBuffer.byteLength === 64) {
         encType = EncryptionType.AesCbc256_HmacSha256_B64;
       } else {
         throw new Error("Unable to determine encType.");
       }
     }
 
-    this.key = key;
+    this.key = keyBuffer;
     this.encType = encType;
 
-    if (encType === EncryptionType.AesCbc256_B64 && key.byteLength === 32) {
-      this.encKey = key;
+    if (encType === EncryptionType.AesCbc256_B64 && keyBuffer.byteLength === 32) {
+      this.encKey = keyBuffer;
       this.macKey = null;
-    } else if (encType === EncryptionType.AesCbc128_HmacSha256_B64 && key.byteLength === 32) {
-      this.encKey = key.slice(0, 16);
-      this.macKey = key.slice(16, 32);
-    } else if (encType === EncryptionType.AesCbc256_HmacSha256_B64 && key.byteLength === 64) {
-      this.encKey = key.slice(0, 32);
-      this.macKey = key.slice(32, 64);
+    } else if (encType === EncryptionType.AesCbc128_HmacSha256_B64 && keyBuffer.byteLength === 32) {
+      this.encKey = keyBuffer.slice(0, 16);
+      this.macKey = keyBuffer.slice(16, 32);
+    } else if (encType === EncryptionType.AesCbc256_HmacSha256_B64 && keyBuffer.byteLength === 64) {
+      this.encKey = keyBuffer.slice(0, 32);
+      this.macKey = keyBuffer.slice(32, 64);
     } else {
       throw new Error("Unsupported encType/key length.");
     }
diff --git a/jslib/common/src/models/request/identityToken/passwordTokenRequest.ts b/jslib/common/src/models/request/identityToken/passwordTokenRequest.ts
index c40e053c..404462ad 100644
--- a/jslib/common/src/models/request/identityToken/passwordTokenRequest.ts
+++ b/jslib/common/src/models/request/identityToken/passwordTokenRequest.ts
@@ -1,5 +1,4 @@
 import { ClientType } from "../../../enums/clientType";
-import { Utils } from "../../../misc/utils";
 import { CaptchaProtectedRequest } from "../captchaProtectedRequest";
 import { DeviceRequest } from "../deviceRequest";
 
diff --git a/jslib/common/src/services/crypto.service.ts b/jslib/common/src/services/crypto.service.ts
index 28b13c5d..764c1c67 100644
--- a/jslib/common/src/services/crypto.service.ts
+++ b/jslib/common/src/services/crypto.service.ts
@@ -10,7 +10,7 @@ import { HashPurpose } from "../enums/hashPurpose";
 import { KdfType } from "../enums/kdfType";
 import { KeySuffixOptions } from "../enums/keySuffixOptions";
 import { sequentialize } from "../misc/sequentialize";
-import { Utils } from "../misc/utils";
+import Utils from "../misc/utils";
 import { EEFLongWordList } from "../misc/wordlist";
 import { EncArrayBuffer } from "../models/domain/encArrayBuffer";
 import { EncString } from "../models/domain/encString";
@@ -109,7 +109,7 @@ export class CryptoService implements CryptoServiceAbstraction {
   ): Promise<SymmetricCryptoKey> {
     const key = await this.retrieveKeyFromStorage(keySuffix, userId);
     if (key != null) {
-      const symmetricKey = new SymmetricCryptoKey(Utils.fromB64ToArray(key).buffer);
+      const symmetricKey = new SymmetricCryptoKey(Utils.fromB64ToArray(key));
 
       if (!(await this.validateKey(symmetricKey))) {
         this.logService.warning("Wrong key, throwing away stored key");
@@ -335,9 +335,11 @@ export class CryptoService implements CryptoServiceAbstraction {
   }
 
   async clearStoredKey(keySuffix: KeySuffixOptions) {
-    keySuffix === KeySuffixOptions.Auto
-      ? await this.stateService.setCryptoMasterKeyAuto(null)
-      : await this.stateService.setCryptoMasterKeyBiometric(null);
+    if (keySuffix === KeySuffixOptions.Auto) {
+      await this.stateService.setCryptoMasterKeyAuto(null);
+    } else {
+      await this.stateService.setCryptoMasterKeyBiometric(null);
+    }
   }
 
   async clearKeyHash(userId?: string): Promise<any> {
@@ -508,9 +510,9 @@ export class CryptoService implements CryptoServiceAbstraction {
       return Promise.resolve(null);
     }
 
-    let plainBuf: ArrayBuffer;
+    let plainBuf: BufferSource;
     if (typeof plainValue === "string") {
-      plainBuf = Utils.fromUtf8ToArray(plainValue).buffer;
+      plainBuf = Utils.fromUtf8ToArray(plainValue);
     } else {
       plainBuf = plainValue;
     }
@@ -583,7 +585,8 @@ export class CryptoService implements CryptoServiceAbstraction {
       throw new Error("encPieces unavailable.");
     }
 
-    const data = Utils.fromB64ToArray(encPieces[0]).buffer;
+    const dataArray = Utils.fromB64ToArray(encPieces[0]);
+    const data = dataArray.buffer as ArrayBuffer;
     const privateKey = privateKeyValue ?? (await this.getPrivateKey());
     if (privateKey == null) {
       throw new Error("No private key.");
@@ -606,9 +609,12 @@ export class CryptoService implements CryptoServiceAbstraction {
   }
 
   async decryptToBytes(encString: EncString, key?: SymmetricCryptoKey): Promise<ArrayBuffer> {
-    const iv = Utils.fromB64ToArray(encString.iv).buffer;
-    const data = Utils.fromB64ToArray(encString.data).buffer;
-    const mac = encString.mac ? Utils.fromB64ToArray(encString.mac).buffer : null;
+    const ivArray = Utils.fromB64ToArray(encString.iv);
+    const iv = ivArray.buffer as ArrayBuffer;
+    const dataArray = Utils.fromB64ToArray(encString.data);
+    const data = dataArray.buffer as ArrayBuffer;
+    const macArray = encString.mac ? Utils.fromB64ToArray(encString.mac) : null;
+    const mac = macArray ? (macArray.buffer as ArrayBuffer) : null;
     const decipher = await this.aesDecryptToBytes(encString.encryptionType, data, iv, mac, key);
     if (decipher == null) {
       return null;
@@ -665,9 +671,9 @@ export class CryptoService implements CryptoServiceAbstraction {
 
     return await this.aesDecryptToBytes(
       encType,
-      ctBytes.buffer,
-      ivBytes.buffer,
-      macBytes != null ? macBytes.buffer : null,
+      ctBytes.buffer as ArrayBuffer,
+      ivBytes.buffer as ArrayBuffer,
+      macBytes != null ? (macBytes.buffer as ArrayBuffer) : null,
       key,
     );
   }
@@ -717,7 +723,7 @@ export class CryptoService implements CryptoServiceAbstraction {
 
       const privateKey = await this.decryptToBytes(new EncString(encPrivateKey), encKey);
       await this.cryptoFunctionService.rsaExtractPublicKey(privateKey);
-    } catch (e) {
+    } catch {
       return false;
     }
 
@@ -754,17 +760,24 @@ export class CryptoService implements CryptoServiceAbstraction {
       : await this.stateService.getCryptoMasterKeyBiometric({ userId: userId });
   }
 
-  private async aesEncrypt(data: ArrayBuffer, key: SymmetricCryptoKey): Promise<EncryptedObject> {
+  private async aesEncrypt(data: BufferSource, key: SymmetricCryptoKey): Promise<EncryptedObject> {
     const obj = new EncryptedObject();
     obj.key = await this.getKeyForEncryption(key);
     obj.iv = await this.cryptoFunctionService.randomBytes(16);
-    obj.data = await this.cryptoFunctionService.aesEncrypt(data, obj.iv, obj.key.encKey);
+
+    const dataBuffer = ArrayBuffer.isView(data)
+      ? (data.byteOffset === 0 && data.byteLength === data.buffer.byteLength
+          ? data.buffer as ArrayBuffer
+          : data.buffer.slice(data.byteOffset, data.byteOffset + data.byteLength) as ArrayBuffer)
+      : data;
+    obj.data = await this.cryptoFunctionService.aesEncrypt(dataBuffer, obj.iv, obj.key.encKey);
 
     if (obj.key.macKey != null) {
       const macData = new Uint8Array(obj.iv.byteLength + obj.data.byteLength);
       macData.set(new Uint8Array(obj.iv), 0);
       macData.set(new Uint8Array(obj.data), obj.iv.byteLength);
-      obj.mac = await this.cryptoFunctionService.hmac(macData.buffer, obj.key.macKey, "sha256");
+
+      obj.mac = await this.cryptoFunctionService.hmac(macData.buffer as ArrayBuffer, obj.key.macKey, "sha256");
     }
 
     return obj;
@@ -830,7 +843,7 @@ export class CryptoService implements CryptoServiceAbstraction {
       macData.set(new Uint8Array(iv), 0);
       macData.set(new Uint8Array(data), iv.byteLength);
       const computedMac = await this.cryptoFunctionService.hmac(
-        macData.buffer,
+        macData.buffer as ArrayBuffer,
         theKey.macKey,
         "sha256",
       );
diff --git a/jslib/node/spec/services/nodeCryptoFunction.service.spec.ts b/jslib/node/spec/services/nodeCryptoFunction.service.spec.ts
index 4272a74f..812bc92f 100644
--- a/jslib/node/spec/services/nodeCryptoFunction.service.spec.ts
+++ b/jslib/node/spec/services/nodeCryptoFunction.service.spec.ts
@@ -1,4 +1,4 @@
-import { Utils } from "@/jslib/common/src/misc/utils";
+import Utils from "@/jslib/common/src/misc/utils";
 import { SymmetricCryptoKey } from "@/jslib/common/src/models/domain/symmetricCryptoKey";
 import { NodeCryptoFunctionService } from "@/jslib/node/src/services/nodeCryptoFunction.service";
 
@@ -93,8 +93,9 @@ describe("NodeCrypto Function Service", () => {
 
     it("should fail with prk too small", async () => {
       const cryptoFunctionService = new NodeCryptoFunctionService();
+      const prk = Utils.fromB64ToArray(prk16Byte);
       const f = cryptoFunctionService.hkdfExpand(
-        Utils.fromB64ToArray(prk16Byte),
+        prk.buffer as ArrayBuffer,
         "info",
         32,
         "sha256",
@@ -104,8 +105,9 @@ describe("NodeCrypto Function Service", () => {
 
     it("should fail with outputByteSize is too large", async () => {
       const cryptoFunctionService = new NodeCryptoFunctionService();
+      const prk = Utils.fromB64ToArray(prk32Byte);
       const f = cryptoFunctionService.hkdfExpand(
-        Utils.fromB64ToArray(prk32Byte),
+        prk.buffer as ArrayBuffer,
         "info",
         8161,
         "sha256",
@@ -341,7 +343,8 @@ function testHkdf(
   utf8Key: string,
   unicodeKey: string,
 ) {
-  const ikm = Utils.fromB64ToArray("criAmKtfzxanbgea5/kelQ==");
+  const ikmArray = Utils.fromB64ToArray("criAmKtfzxanbgea5/kelQ==");
+  const ikm = ikmArray.buffer as ArrayBuffer;
 
   const regularSalt = "salt";
   const utf8Salt = "üser_salt";
@@ -392,8 +395,9 @@ function testHkdfExpand(
 
   it("should create valid " + algorithm + " " + outputByteSize + " byte okm", async () => {
     const cryptoFunctionService = new NodeCryptoFunctionService();
+    const prk = Utils.fromB64ToArray(b64prk);
     const okm = await cryptoFunctionService.hkdfExpand(
-      Utils.fromB64ToArray(b64prk),
+      prk.buffer as ArrayBuffer,
       info,
       outputByteSize,
       algorithm,
diff --git a/jslib/node/src/services/nodeCryptoFunction.service.ts b/jslib/node/src/services/nodeCryptoFunction.service.ts
index af9d570d..48d9e88f 100644
--- a/jslib/node/src/services/nodeCryptoFunction.service.ts
+++ b/jslib/node/src/services/nodeCryptoFunction.service.ts
@@ -3,7 +3,7 @@ import * as crypto from "crypto";
 import * as forge from "node-forge";
 
 import { CryptoFunctionService } from "@/jslib/common/src/abstractions/cryptoFunction.service";
-import { Utils } from "@/jslib/common/src/misc/utils";
+import Utils from "@/jslib/common/src/misc/utils";
 import { DecryptParameters } from "@/jslib/common/src/models/domain/decryptParameters";
 import { SymmetricCryptoKey } from "@/jslib/common/src/models/domain/symmetricCryptoKey";
 
@@ -215,7 +215,8 @@ export class NodeCryptoFunctionService implements CryptoFunctionService {
     const publicKeyAsn1 = forge.pki.publicKeyToAsn1(forgePublicKey);
     const publicKeyByteString = forge.asn1.toDer(publicKeyAsn1).data;
     const publicKeyArray = Utils.fromByteStringToArray(publicKeyByteString);
-    return Promise.resolve(publicKeyArray.buffer);
+
+    return Promise.resolve(publicKeyArray.buffer as ArrayBuffer);
   }
 
   async rsaGenerateKeyPair(length: 1024 | 2048 | 4096): Promise<[ArrayBuffer, ArrayBuffer]> {
@@ -241,7 +242,7 @@ export class NodeCryptoFunctionService implements CryptoFunctionService {
           const privateKeyByteString = forge.asn1.toDer(privateKeyPkcs8).getBytes();
           const privateKey = Utils.fromByteStringToArray(privateKeyByteString);
 
-          resolve([publicKey.buffer, privateKey.buffer]);
+          resolve([publicKey.buffer as ArrayBuffer, privateKey.buffer as ArrayBuffer]);
         },
       );
     });
diff --git a/scripts/notarize.js b/scripts/notarize.js
index 3085278d..cc51e576 100644
--- a/scripts/notarize.js
+++ b/scripts/notarize.js
@@ -1,6 +1,8 @@
 /* eslint-disable @typescript-eslint/no-var-requires */
-require("dotenv").config();
-const { notarize } = require("@electron/notarize");
+import { notarize } from "@electron/notarize";
+import { config } from "dotenv";
+
+config();
 
 exports.default = async function notarizing(context) {
   const { electronPlatformName, appOutDir } = context;
diff --git a/scripts/sign.js b/scripts/sign.js
index 46d64aa7..985167e1 100644
--- a/scripts/sign.js
+++ b/scripts/sign.js
@@ -1,8 +1,10 @@
 /* eslint-disable @typescript-eslint/no-var-requires, no-console */
+import { execSync } from "child_process";
+
 exports.default = async function (configuration) {
   if (parseInt(process.env.ELECTRON_BUILDER_SIGN) === 1 && configuration.path.slice(-4) == ".exe") {
     console.log(`[*] Signing file: ${configuration.path}`);
-    require("child_process").execSync(
+    execSync(
       `azuresigntool sign ` +
         `-kvu ${process.env.SIGNING_VAULT_URL} ` +
         `-kvi ${process.env.SIGNING_CLIENT_ID} ` +
diff --git a/src/app/main.ts b/src/app/main.ts
index 985222bb..da1cc2a3 100644
--- a/src/app/main.ts
+++ b/src/app/main.ts
@@ -3,8 +3,7 @@ import { platformBrowserDynamic } from "@angular/platform-browser-dynamic";
 
 import { isDev } from "@/jslib/electron/src/utils";
 
-// tslint:disable-next-line
-require("../scss/styles.scss");
+import "../scss/styles.scss";
 
 import { AppModule } from "./app.module";