add named import for Buffer module

src/abi.ts

@@ -1,5 +1,6 @@
 import { AbiCoder, formatSignature as _formatSignature } from '@vechain/ethers/utils/abi-coder'
 import { keccak256 } from './keccak'
+import { Buffer } from 'buffer'
 
 class Coder extends AbiCoder {
     constructor() {

src/blake2b.ts

@@ -1,4 +1,5 @@
 import  blake from 'blakejs'
+import { Buffer } from 'buffer'
 
 /**
  * computes blake2b 256bit hash of given data

src/bloom.ts

@@ -1,4 +1,5 @@
 import { blake2b256 } from './blake2b'
+import { Buffer } from 'buffer'
 
 /**
  * 2048 bits Bloom filter

src/certificate.ts

@@ -2,6 +2,7 @@ import { address } from './address'
 import { blake2b256 } from './blake2b'
 import { secp256k1 } from './secp256k1'
 import fastJsonStableStringify from 'fast-json-stable-stringify'
+import { Buffer } from 'buffer'
 
 /**
  * Client side self-signed certificate

src/hdnode.ts

@@ -3,6 +3,7 @@ import * as HD from '@vechain/ethers/utils/hdnode'
 import { createHash } from 'crypto'
 import { ec as EC } from 'elliptic'
 import { address } from './address'
+import { Buffer } from 'buffer'
 
 // see https://github.com/satoshilabs/slips/blob/master/slip-0044.md
 const VET_DERIVATION_PATH = `m/44'/818'/0'/0`

src/keccak.ts

@@ -1,4 +1,5 @@
 import { keccak_256 } from 'js-sha3'
+import { Buffer } from 'buffer'
 /**
  * computes keccak256 hash of given data
  * @param data one or more Buffer | string

src/keystore.ts

@@ -1,4 +1,5 @@
 import * as SecretStorage from '@vechain/ethers/utils/secret-storage'
+import { Buffer } from 'buffer'
 
 /** to present encrypted private key in Ethereum keystore format. */
 export interface Keystore {

src/rlp.ts

@@ -1,5 +1,6 @@
 import BigNumber from 'bignumber.js'
 import * as rlp from 'rlp'
+import { Buffer } from 'buffer'
 
 export class RLP {
     constructor(readonly profile: RLP.Profile) { }

src/secp256k1.ts

@@ -1,5 +1,6 @@
 import { randomBytes } from 'crypto'
 import { ec as EC } from 'elliptic'
+import { Buffer } from 'buffer'
 
 const curve = new EC('secp256k1')
 

src/transaction.ts

@@ -2,6 +2,7 @@ import { address } from './address'
 import { blake2b256 } from './blake2b'
 import { RLP } from './rlp'
 import { secp256k1 } from './secp256k1'
+import { Buffer } from 'buffer'
 
 /** Transaction class defines VeChainThor's multi-clause transaction */
 export class Transaction {