diff --git a/packages/web3-eth-accounts/types/index.d.ts b/packages/web3-eth-accounts/types/index.d.ts
index bec0d7c916a..30d6880308e 100644
--- a/packages/web3-eth-accounts/types/index.d.ts
+++ b/packages/web3-eth-accounts/types/index.d.ts
@@ -21,10 +21,7 @@ import {AbstractWeb3Module, Transaction, Web3ModuleOptions} from 'web3-core';
 import {provider} from 'web3-providers';
 
 export class Accounts extends AbstractWeb3Module {
-    constructor(
-        provider: provider,
-        options?: Web3ModuleOptions
-    );
+    constructor(provider: provider, options?: Web3ModuleOptions);
 
     create(entropy?: string): Account;
 
@@ -36,7 +33,7 @@ export class Accounts extends AbstractWeb3Module {
 
     hashMessage(message: string): string;
 
-    sign(data: string, privateKey: string): string | Sign;
+    sign(data: string, privateKey: string): Sign;
 
     recover(message: SignedTransaction): string;
     recover(message: string | SignedTransaction, signature: string, preFixed?: boolean): string;
@@ -54,7 +51,7 @@ export class Wallet {
 
     create(numberOfAccounts: number, entropy?: string): Wallet;
 
-    add(account: string | Account): AddedAccount;
+    add(account: string | AddAccount): AddedAccount;
 
     remove(account: string | number): boolean;
 
@@ -69,12 +66,20 @@ export class Wallet {
     load(password: string, keyName?: string): Wallet;
 }
 
+export interface AddAccount {
+    address: string;
+    privateKey: string;
+}
+
 export interface Account {
     address: string;
     privateKey: string;
-    signTransaction?: (tx: Transaction) => {};
-    sign?: (data: string) => {};
-    encrypt?: (password: string) => {};
+    signTransaction: (
+        tx: Transaction,
+        callback?: (signTransaction: SignedTransaction) => void
+    ) => Promise<SignedTransaction>;
+    sign: (data: string) => Sign;
+    encrypt: (password: string) => EncryptedKeystoreV3Json;
 }
 
 export interface AddedAccount extends Account {
@@ -83,22 +88,22 @@ export interface AddedAccount extends Account {
 
 export interface EncryptedKeystoreV3Json {
     version: number;
-    id: string,
-    address: string,
+    id: string;
+    address: string;
     crypto: {
-        ciphertext: string,
-        cipherparams: {iv: string},
-        cipher: string,
-        kdf: string,
+        ciphertext: string;
+        cipherparams: {iv: string};
+        cipher: string;
+        kdf: string;
         kdfparams: {
-            dklen: number,
-            salt: string,
-            n: number,
-            r: number,
-            p: number
-        },
+            dklen: number;
+            salt: string;
+            n: number;
+            r: number;
+            p: number;
+        };
         mac: string;
-    }
+    };
 }
 
 export interface SignedTransaction {
diff --git a/packages/web3-eth-accounts/types/tests/accounts-tests.ts b/packages/web3-eth-accounts/types/tests/accounts-tests.ts
index 78dcd8ec07f..ae5e1a7b56b 100644
--- a/packages/web3-eth-accounts/types/tests/accounts-tests.ts
+++ b/packages/web3-eth-accounts/types/tests/accounts-tests.ts
@@ -29,18 +29,27 @@ accounts.create('2435@#@#@±±±±!!!!678543213456764321§3456754321345678543213
 accounts.privateKeyToAccount('0x348ce564d427a3311b6536bbcff9390d69395b06ed6c486954e971d960fe8709');
 
 // $ExpectType Promise<SignedTransaction>
-accounts.signTransaction({
-    to: '0xF0109fC8DF283027b6285cc889F5aA624EaC1F55',
-    value: '1000000000',
-    gas: 2000000
-}, '0x4c0883a69102937d6231471b5dbb6204fe5129617082792ae468d01a3f362318');
+accounts.signTransaction(
+    {
+        to: '0xF0109fC8DF283027b6285cc889F5aA624EaC1F55',
+        value: '1000000000',
+        gas: 2000000
+    },
+    '0x4c0883a69102937d6231471b5dbb6204fe5129617082792ae468d01a3f362318'
+);
 
 // $ExpectType Promise<SignedTransaction>
-accounts.signTransaction({
-    to: '0xF0109fC8DF283027b6285cc889F5aA624EaC1F55',
-    value: '1000000000',
-    gas: 2000000
-}, '0x4c0883a69102937d6231471b5dbb6204fe5129617082792ae468d01a3f362318', () => { console.log('hey') });
+accounts.signTransaction(
+    {
+        to: '0xF0109fC8DF283027b6285cc889F5aA624EaC1F55',
+        value: '1000000000',
+        gas: 2000000
+    },
+    '0x4c0883a69102937d6231471b5dbb6204fe5129617082792ae468d01a3f362318',
+    () => {
+        console.log('hey');
+    }
+);
 
 // $ExpectType string
 accounts.recoverTransaction('0xf861808084aefcdfa08e7d2ee3f0b9d9ae184b2001fe0aff07603d9');
@@ -48,7 +57,7 @@ accounts.recoverTransaction('0xf861808084aefcdfa08e7d2ee3f0b9d9ae184b2001fe0aff0
 // $ExpectType string
 accounts.hashMessage('hello world');
 
-// $ExpectType string | Sign
+// $ExpectType Sign
 accounts.sign('Some data', '0x4c0883a69102937d6231471b5dbb6204fe5129617082792ae468d01a3f362318');
 
 // $ExpectType string
@@ -60,34 +69,45 @@ accounts.recover({
 });
 
 // $ExpectType string
-accounts.recover('Some data', '0xb91467e570a6466aa9e9876cbcd013baba02900b8979d43fe208a4a4f339f5fd6007e74cd82e037b800186422fc2da167c747ef045e5d18a5f5d4300f8e1a0291c');
+accounts.recover(
+    'Some data',
+    '0xb91467e570a6466aa9e9876cbcd013baba02900b8979d43fe208a4a4f339f5fd6007e74cd82e037b800186422fc2da167c747ef045e5d18a5f5d4300f8e1a0291c'
+);
 
 // $ExpectType string
-accounts.recover('Some data', '0x1c', '0xb91467e570a6466aa9e9876cbcd013baba02900b8979d43fe208a4a4f339f5fd', '0x6007e74cd82e037b800186422fc2da167c747ef045e5d18a5f5d4300f8e1a029');
+accounts.recover(
+    'Some data',
+    '0x1c',
+    '0xb91467e570a6466aa9e9876cbcd013baba02900b8979d43fe208a4a4f339f5fd',
+    '0x6007e74cd82e037b800186422fc2da167c747ef045e5d18a5f5d4300f8e1a029'
+);
 
 // $ExpectType EncryptedKeystoreV3Json
 accounts.encrypt('0x4c0883a69102937d6231471b5dbb6204fe5129617082792ae468d01a3f362318', 'test!');
 
 // $ExpectType Account
-accounts.decrypt({
-    version: 3,
-    id: '04e9bcbb-96fa-497b-94d1-14df4cd20af6',
-    address: '2c7536e3605d9c16a7a3d7b1898e529396a65c23',
-    crypto: {
-        ciphertext: 'a1c25da3ecde4e6a24f3697251dd15d6208520efc84ad97397e906e6df24d251',
-        cipherparams: { iv: '2885df2b63f7ef247d753c82fa20038a' },
-        cipher: 'aes-128-ctr',
-        kdf: 'scrypt',
-        kdfparams: {
-            dklen: 32,
-            salt: '4531b3c174cc3ff32a6a7a85d6761b410db674807b2d216d022318ceee50be10',
-            n: 262144,
-            r: 8,
-            p: 1
-        },
-        mac: 'b8b010fff37f9ae5559a352a185e86f9b9c1d7f7a9f1bd4e82a5dd35468fc7f6'
-    }
-}, 'test!');
+accounts.decrypt(
+    {
+        version: 3,
+        id: '04e9bcbb-96fa-497b-94d1-14df4cd20af6',
+        address: '2c7536e3605d9c16a7a3d7b1898e529396a65c23',
+        crypto: {
+            ciphertext: 'a1c25da3ecde4e6a24f3697251dd15d6208520efc84ad97397e906e6df24d251',
+            cipherparams: {iv: '2885df2b63f7ef247d753c82fa20038a'},
+            cipher: 'aes-128-ctr',
+            kdf: 'scrypt',
+            kdfparams: {
+                dklen: 32,
+                salt: '4531b3c174cc3ff32a6a7a85d6761b410db674807b2d216d022318ceee50be10',
+                n: 262144,
+                r: 8,
+                p: 1
+            },
+            mac: 'b8b010fff37f9ae5559a352a185e86f9b9c1d7f7a9f1bd4e82a5dd35468fc7f6'
+        }
+    },
+    'test!'
+);
 
 // $ExpectType Wallet
 accounts.wallet.create(2);
@@ -117,50 +137,49 @@ accounts.wallet.clear();
 accounts.wallet.encrypt('test');
 
 // $ExpectType Wallet
-accounts.wallet.decrypt([
-    {
-        version: 3,
-        id: '83191a81-aaca-451f-b63d-0c5f3b849289',
-        address: '06f702337909c06c82b09b7a22f0a2f0855d1f68',
-        crypto:
+accounts.wallet.decrypt(
+    [
         {
-            ciphertext: '7d34deae112841fba86e3e6cf08f5398dda323a8e4d29332621534e2c4069e8d',
-            cipherparams: { iv: '497f4d26997a84d570778eae874b2333' },
-            cipher: 'aes-128-ctr',
-            kdf: 'scrypt',
-            kdfparams:
-            {
-                dklen: 32,
-                salt: '208dd732a27aa4803bb760228dff18515d5313fd085bbce60594a3919ae2d88d',
-                n: 262144,
-                r: 8,
-                p: 1
-            },
-            mac: '0062a853de302513c57bfe3108ab493733034bf3cb313326f42cf26ea2619cf9'
-        }
-    },
-    {
-        version: 3,
-        id: '7d6b91fa-3611-407b-b16b-396efb28f97e',
-        address: 'b5d89661b59a9af0b34f58d19138baa2de48baaf',
-        crypto:
+            version: 3,
+            id: '83191a81-aaca-451f-b63d-0c5f3b849289',
+            address: '06f702337909c06c82b09b7a22f0a2f0855d1f68',
+            crypto: {
+                ciphertext: '7d34deae112841fba86e3e6cf08f5398dda323a8e4d29332621534e2c4069e8d',
+                cipherparams: {iv: '497f4d26997a84d570778eae874b2333'},
+                cipher: 'aes-128-ctr',
+                kdf: 'scrypt',
+                kdfparams: {
+                    dklen: 32,
+                    salt: '208dd732a27aa4803bb760228dff18515d5313fd085bbce60594a3919ae2d88d',
+                    n: 262144,
+                    r: 8,
+                    p: 1
+                },
+                mac: '0062a853de302513c57bfe3108ab493733034bf3cb313326f42cf26ea2619cf9'
+            }
+        },
         {
-            ciphertext: 'cb9712d1982ff89f571fa5dbef447f14b7e5f142232bd2a913aac833730eeb43',
-            cipherparams: { iv: '8cccb91cb84e435437f7282ec2ffd2db' },
-            cipher: 'aes-128-ctr',
-            kdf: 'scrypt',
-            kdfparams:
-            {
-                dklen: 32,
-                salt: '08ba6736363c5586434cd5b895e6fe41ea7db4785bd9b901dedce77a1514e8b8',
-                n: 262144,
-                r: 8,
-                p: 1
-            },
-            mac: 'd2eb068b37e2df55f56fa97a2bf4f55e072bef0dd703bfd917717d9dc54510f0'
+            version: 3,
+            id: '7d6b91fa-3611-407b-b16b-396efb28f97e',
+            address: 'b5d89661b59a9af0b34f58d19138baa2de48baaf',
+            crypto: {
+                ciphertext: 'cb9712d1982ff89f571fa5dbef447f14b7e5f142232bd2a913aac833730eeb43',
+                cipherparams: {iv: '8cccb91cb84e435437f7282ec2ffd2db'},
+                cipher: 'aes-128-ctr',
+                kdf: 'scrypt',
+                kdfparams: {
+                    dklen: 32,
+                    salt: '08ba6736363c5586434cd5b895e6fe41ea7db4785bd9b901dedce77a1514e8b8',
+                    n: 262144,
+                    r: 8,
+                    p: 1
+                },
+                mac: 'd2eb068b37e2df55f56fa97a2bf4f55e072bef0dd703bfd917717d9dc54510f0'
+            }
         }
-    }
-], 'test');
+    ],
+    'test'
+);
 
 // $ExpectType boolean
 accounts.wallet.save('test#!$');