diff --git a/src/kdf.ts b/src/kdf.ts
index 51cac13..1ae5fbe 100644
--- a/src/kdf.ts
+++ b/src/kdf.ts
@@ -23,7 +23,7 @@ export async function hkdf(key: Uint8Array, usage: Usage, context?: string): Pro
     return null
   }
 
-  let material: CryptoKey;
+  let material: CryptoKey
   try {
     material = await crypto.subtle.importKey('raw', key, 'HKDF', false, ['deriveKey'])
   } catch (e) {
@@ -112,10 +112,15 @@ export async function pbkdf(salt: Uint8Array, password: string): Promise<Uint8Ar
 
   return new Uint8Array(buffer)
 }
-export async function ecdh(privkey: CryptoKey, pubkey: CryptoKey, usage: DHusage, context?: string): Promise<CryptoKey | null> {
+export async function ecdh(
+  privkey: CryptoKey,
+  pubkey: CryptoKey,
+  usage: DHusage,
+  context?: string
+): Promise<CryptoKey | null> {
   log.trace('ecdh')
 
-  let seed_bits: ArrayBuffer;
+  let seed_bits: ArrayBuffer
   try {
     seed_bits = await crypto.subtle.deriveBits(
       {
diff --git a/src/private-box.ts b/src/private-box.ts
index 218c9f0..7cb34cf 100644
--- a/src/private-box.ts
+++ b/src/private-box.ts
@@ -14,7 +14,7 @@ export default class PrivateBox {
 
   public static async gen(extractable: boolean = true): Promise<CryptoKeyPair> {
     log.trace('generate keypair')
-    return await crypto.subtle.generateKey(consts.ECDH, extractable, ['deriveBits']) as CryptoKeyPair
+    return await crypto.subtle.generateKey(consts.ECDH, extractable, ['deriveBits'])
   }
 
   public static async encrypt(data: Uint8Array, pubkey: CryptoKey, context?: string): Promise<PrivateBox | null> {
diff --git a/src/private-wrap.ts b/src/private-wrap.ts
index 5f2a926..893680e 100644
--- a/src/private-wrap.ts
+++ b/src/private-wrap.ts
@@ -14,7 +14,7 @@ export default class PrivateWrap {
 
   public static async gen(extractable: boolean = true): Promise<CryptoKeyPair> {
     log.trace('generate keypair')
-    return await crypto.subtle.generateKey(consts.ECDH, extractable, ['deriveBits']) as CryptoKeyPair
+    return (await crypto.subtle.generateKey(consts.ECDH, extractable, ['deriveBits'])) as CryptoKeyPair
   }
 
   public static async wrap(data: CryptoKey, pubkey: CryptoKey, context?: string): Promise<PrivateWrap | null> {
diff --git a/src/pwd-box.ts b/src/pwd-box.ts
index 5849a9f..6cf9a9a 100644
--- a/src/pwd-box.ts
+++ b/src/pwd-box.ts
@@ -14,7 +14,7 @@ export default class PwdBox {
   private static async derive(pwd: string, salt: Uint8Array, context?: string): Promise<CryptoKey | null> {
     const k = await pbkdf(salt, pwd)
     if (k === null) return null
-    return await hkdf(k, Usage.box, context) as CryptoKey
+    return (await hkdf(k, Usage.box, context)) as CryptoKey
   }
 
   public static async encrypt(data: Uint8Array, pwd: string, context?: string): Promise<PwdBox | null> {
diff --git a/src/secret-box.ts b/src/secret-box.ts
index 60762a9..83d5be2 100644
--- a/src/secret-box.ts
+++ b/src/secret-box.ts
@@ -27,7 +27,7 @@ export default class SecretBox {
 
     const iv = crypto.getRandomValues(new Uint8Array(12))
 
-    let cipher: ArrayBuffer;
+    let cipher: ArrayBuffer
     try {
       cipher = await crypto.subtle.encrypt(
         {
diff --git a/src/secret-wrap.ts b/src/secret-wrap.ts
index 2aa2e93..cf17a6f 100644
--- a/src/secret-wrap.ts
+++ b/src/secret-wrap.ts
@@ -45,7 +45,7 @@ export default class SecretWrap {
 
     const iv = crypto.getRandomValues(new Uint8Array(12))
 
-    let box: ArrayBuffer;
+    let box: ArrayBuffer
     try {
       box = await crypto.subtle.wrapKey(format, data, key, {name: consts.ENCRYPTION, iv})
     } catch (e) {