providers, init, util, txRunner

libs/remix-lib/src/execution/execution-context.ts

@@ -9,6 +9,7 @@ const Web3VMProvider = require('../web3Provider/web3VmProvider')
 
 const LogsManager = require('./logsManager.js')
 
+declare let ethereum: any;
 let web3
 if (typeof window !== 'undefined' && typeof window['ethereum'] !== 'undefined') {
   var injectedProvider = window['ethereum']

libs/remix-lib/src/execution/txRunner.ts

@@ -1,7 +1,7 @@
 'use strict'
 import { Transaction } from 'ethereumjs-tx'
 import { Block } from 'ethereumjs-block'
-import { BN } from 'ethereumjs-util'
+import { BN, bufferToHex } from 'ethereumjs-util'
 import  { ExecutionContext } from './execution-context'
 const EventManager = require('../eventManager')
 

libs/remix-lib/src/init.ts

@@ -1,31 +1,36 @@
 'use strict'
-const Web3 = require('web3')
+import Web3 from 'web3'
 
-module.exports = {
-  loadWeb3: function (url) {
-    if (!url) url = 'http://localhost:8545'
+export function loadWeb3 (url = 'http://localhost:8545') {
   const web3 = new Web3()
-    web3.setProvider(new web3.providers.HttpProvider(url))
+  web3.setProvider(new Web3.providers.HttpProvider(url))
   this.extend(web3)
   return web3
-  },
+}
 
-  extendWeb3: function (web3) {
+export function extendWeb3 (web3) {
   this.extend(web3)
-  },
+}
 
-  setProvider: function (web3, url) {
+export function setProvider (web3, url) {
   web3.setProvider(new web3.providers.HttpProvider(url))
-  },
+}
 
-  web3DebugNode: function (network) {
+export function web3DebugNode (network) {
+  const web3DebugNodes = {
+    'Main': 'https://gethmainnet.komputing.org',
+    'Rinkeby': 'https://remix-rinkeby.ethdevops.io',
+    'Ropsten': 'https://remix-ropsten.ethdevops.io',
+    'Goerli': 'https://remix-goerli.ethdevops.io',
+    'Kovan': 'https://remix-kovan.ethdevops.io'
+  }
   if (web3DebugNodes[network]) {
     return this.loadWeb3(web3DebugNodes[network])
   }
   return null
-  },
+}
 
-  extend: function (web3) {
+export function extend (web3) {
     if (!web3.extend) {
       return
     }
@@ -65,12 +70,3 @@ module.exports = {
       })
     }
   }
-}
-
-const web3DebugNodes = {
-  'Main': 'https://gethmainnet.komputing.org',
-  'Rinkeby': 'https://remix-rinkeby.ethdevops.io',
-  'Ropsten': 'https://remix-ropsten.ethdevops.io',
-  'Goerli': 'https://remix-goerli.ethdevops.io',
-  'Kovan': 'https://remix-kovan.ethdevops.io'
-}

libs/remix-lib/src/util.ts

@@ -10,11 +10,10 @@ import { BN, bufferToHex, keccak, setLengthLeft } from 'ethereumjs-util'
   - swarm hash extraction
   - bytecode comparison
 */
-module.exports = {
   /*
     ints: IntArray
   */
-  hexConvert: function (ints) {
+export function hexConvert (ints) {
   let ret = '0x'
   for (let i = 0; i < ints.length; i++) {
     const h = ints[i]
@@ -25,12 +24,12 @@ module.exports = {
     }
   }
   return ret
-  },
+}
 
   /**
    * Converts a hex string to an array of integers.
    */
-  hexToIntArray: function (hexString) {
+export function hexToIntArray (hexString) {
   if (hexString.slice(0, 2) === '0x') {
     hexString = hexString.slice(2)
   }
@@ -39,12 +38,12 @@ module.exports = {
     integers.push(parseInt(hexString.slice(i, i + 2), 16))
   }
   return integers
-  },
+}
 
   /*
     ints: list of BNs
   */
-  hexListFromBNs: function (bnList) {
+export function hexListFromBNs (bnList) {
   const ret = []
   for (let k in bnList) {
     const v = bnList[k]
@@ -55,23 +54,23 @@ module.exports = {
     }
   }
   return ret
-  },
+}
 
-  /*
+/*
   ints: list of IntArrays
-  */
-  hexListConvert: function (intsList) {
+*/
+export function hexListConvert (intsList) {
   const ret = []
   for (let k in intsList) {
     ret.push(this.hexConvert(intsList[k]))
   }
   return ret
-  },
+}
 
-  /*
+/*
   ints: ints: IntArray
-  */
-  formatMemory: function (mem) {
+*/
+export function formatMemory (mem) {
   const hexMem = this.hexConvert(mem).substr(2)
   const ret = []
   for (let k = 0; k < hexMem.length; k += 32) {
@@ -79,14 +78,14 @@ module.exports = {
     ret.push(row)
   }
   return ret
-  },
+}
 
-  /*
+/*
   Binary Search:
   Assumes that @arg array is sorted increasingly
   return largest i such that array[i] <= target; return -1 if array[0] > target || array is empty
-  */
-  findLowerBound: function (target, array) {
+*/
+export function findLowerBound (target, array) {
   let start = 0
   let length = array.length
   while (length > 0) {
@@ -100,25 +99,25 @@ module.exports = {
     }
   }
   return start - 1
-  },
+}
 
-  /*
+/*
   Binary Search:
   Assumes that @arg array is sorted increasingly
   return largest array[i] such that array[i] <= target; return null if array[0] > target || array is empty
-  */
-  findLowerBoundValue: function (target, array) {
+*/
+export function findLowerBoundValue (target, array) {
   const index = this.findLowerBound(target, array)
   return index >= 0 ? array[index] : null
-  },
+}
 
-  /*
+/*
   Binary Search:
   Assumes that @arg array is sorted increasingly
   return Return i such that |array[i] - target| is smallest among all i and -1 for an empty array.
   Returns the smallest i for multiple candidates.
-  */
-  findClosestIndex: function (target, array) {
+*/
+export function findClosestIndex (target, array): number {
   if (array.length === 0) {
     return -1
   }
@@ -131,16 +130,19 @@ module.exports = {
     const middle = (array[index] + array[index + 1]) / 2
     return target <= middle ? index : index + 1
   }
-  },
+}
 
-  /**
+/**
   * Find the call from @args rootCall which contains @args index (recursive)
   *
   * @param {Int} index - index of the vmtrace
   * @param {Object} rootCall  - call tree, built by the trace analyser
   * @return {Object} - return the call which include the @args index
   */
-  findCall: findCall,
+export function  findCall (index, rootCall) {
+  const ret = buildCallPath(index, rootCall)
+  return ret[ret.length - 1]
+}
 
   /**
   * Find calls path from @args rootCall which leads to @args index (recursive)
@@ -149,7 +151,11 @@ module.exports = {
   * @param {Object} rootCall  - call tree, built by the trace analyser
   * @return {Array} - return the calls path to @args index
   */
-  buildCallPath: buildCallPath,
+export function buildCallPath (index, rootCall) {
+  const ret = []
+  findCallInternal(index, rootCall, ret)
+  return ret
+}
 
   /**
   * sha3 the given @arg value (left pad to 32 bytes)
@@ -157,63 +163,63 @@ module.exports = {
   * @param {String} value - value to sha3
   * @return {Object} - return sha3ied value
   */
-  sha3_256: function (value) {
+ export function sha3_256 (value) {
   if (typeof value === 'string' && value.indexOf('0x') !== 0) {
     value = '0x' + value
   }
   let ret: any = bufferToHex(setLengthLeft(value, 32))
   ret = keccak(ret)
   return bufferToHex(ret)
-  },
+}
 
-  /**
+/**
   * return a regex which extract the swarmhash from the bytecode.
   *
   * @return {RegEx}
   */
-  swarmHashExtraction: function () {
+export function swarmHashExtraction () {
   return /a165627a7a72305820([0-9a-f]{64})0029$/
-  },
+}
 
-  /**
+/**
   * return a regex which extract the swarmhash from the bytecode, from POC 0.3
   *
   * @return {RegEx}
   */
-  swarmHashExtractionPOC31: function () {
+ export function swarmHashExtractionPOC31 () {
   return /a265627a7a72315820([0-9a-f]{64})64736f6c6343([0-9a-f]{6})0032$/
-  },
+}
 
-  /**
+/**
   * return a regex which extract the swarmhash from the bytecode, from POC 0.3
   *
   * @return {RegEx}
   */
-  swarmHashExtractionPOC32: function () {
+export function swarmHashExtractionPOC32 () {
   return /a265627a7a72305820([0-9a-f]{64})64736f6c6343([0-9a-f]{6})0032$/
-  },
+}
 
-  /**
+/**
   * return a regex which extract the cbor encoded metadata : {"ipfs": <IPFS hash>, "solc": <compiler version>} from the bytecode.
   * ref https://solidity.readthedocs.io/en/v0.6.6/metadata.html?highlight=ipfs#encoding-of-the-metadata-hash-in-the-bytecode
   * @return {RegEx}
   */
-  cborEncodedValueExtraction: function () {
+export function cborEncodedValueExtraction () {
   return /64697066735822([0-9a-f]{68})64736f6c6343([0-9a-f]{6})0033$/
-  },
+}
 
-  extractcborMetadata: function (value) {
+export function extractcborMetadata (value) {
   return value.replace(this.cborEncodedValueExtraction(), '')
-  },
+}
 
-  extractSwarmHash: function (value) {
+export function extractSwarmHash (value) {
   value = value.replace(this.swarmHashExtraction(), '')
   value = value.replace(this.swarmHashExtractionPOC31(), '')
   value = value.replace(this.swarmHashExtractionPOC32(), '')
   return value
-  },
+}
 
-  /**
+/**
   * Compare bytecode. return true if the code is equal (handle swarm hash and library references)
   * @param {String} code1 - the bytecode that is actually deployed (contains resolved library reference and a potentially different swarmhash)
   * @param {String} code2 - the bytecode generated by the compiler (contains unresolved library reference and a potentially different swarmhash)
@@ -221,7 +227,7 @@ module.exports = {
   *
   * @return {bool}
   */
-  compareByteCode: function (code1, code2) {
+ export function compareByteCode (code1, code2) {
   if (code1 === code2) return true
   if (code2 === '0x') return false // abstract contract. see comment
 
@@ -245,25 +251,29 @@ module.exports = {
     return true
   }
   return false
-  },
-  groupBy: groupBy,
-  concatWithSeperator: concatWithSeperator,
-  escapeRegExp: escapeRegExp
+}
+/* util extracted out from remix-ide. @TODO split this file, cause it mix real util fn with solidity related stuff ... */
+export function groupBy (arr, key) {
+  return arr.reduce((sum, item) => {
+    const groupByVal = item[key]
+    const groupedItems = sum[groupByVal] || []
+    groupedItems.push(item)
+    sum[groupByVal] = groupedItems
+    return sum
+  }, {})
 }
 
-function replaceLibReference (code, pos) {
-  return code.substring(0, pos) + '0000000000000000000000000000000000000000' + code.substring(pos + 40)
+export function concatWithSeperator (list, seperator) {
+  return list.reduce((sum, item) => sum + item + seperator, '').slice(0, -seperator.length)
 }
 
-function buildCallPath (index, rootCall) {
-  const ret = []
-  findCallInternal(index, rootCall, ret)
-  return ret
+export function escapeRegExp (str) {
+  return str.replace(/[-[\]/{}()+?.\\^$|]/g, '\\$&')
 }
 
-function findCall (index, rootCall) {
-  const ret = buildCallPath(index, rootCall)
-  return ret[ret.length - 1]
+
+function replaceLibReference (code, pos) {
+  return code.substring(0, pos) + '0000000000000000000000000000000000000000' + code.substring(pos + 40)
 }
 
 function findCallInternal (index, rootCall, callsPath) {
@@ -279,22 +289,3 @@ function findCallInternal (index, rootCall, callsPath) {
   }
   return ret
 }
-
-/* util extracted out from remix-ide. @TODO split this file, cause it mix real util fn with solidity related stuff ... */
-function groupBy (arr, key) {
-  return arr.reduce((sum, item) => {
-    const groupByVal = item[key]
-    const groupedItems = sum[groupByVal] || []
-    groupedItems.push(item)
-    sum[groupByVal] = groupedItems
-    return sum
-  }, {})
-}
-
-function concatWithSeperator (list, seperator) {
-  return list.reduce((sum, item) => sum + item + seperator, '').slice(0, -seperator.length)
-}
-
-function escapeRegExp (str) {
-  return str.replace(/[-[\]/{}()+?.\\^$|]/g, '\\$&')
-}

libs/remix-lib/src/web3Provider/dummyProvider.ts

@@ -1,4 +1,10 @@
-function dummyProvider () {
+export class dummyProvider {
+  eth
+  debug
+  providers
+  currentProvider
+
+  constructor() {
     this.eth = {}
     this.debug = {}
     this.eth.getCode = (address, cb) => { return this.getCode(address, cb) }
@@ -9,42 +15,41 @@ function dummyProvider () {
     this.debug.storageRangeAt = (blockNumber, txIndex, address, start, end, maxLength, cb) => { return this.storageRangeAt(blockNumber, txIndex, address, start, end, maxLength, cb) }
     this.providers = { 'HttpProvider': function (url) {} }
     this.currentProvider = {'host': ''}
-}
+  }
 
-dummyProvider.prototype.getCode = function (address, cb) {
+  getCode (address, cb) {
     cb(null, '')
-}
+  }
 
-dummyProvider.prototype.setProvider = function (provider) {}
+  setProvider (provider) {}
 
-dummyProvider.prototype.traceTransaction = function (txHash, options, cb) {
+  traceTransaction (txHash, options, cb) {
     if (cb) {
       cb(null, {})
     }
     return {}
-}
+  }
 
-dummyProvider.prototype.storageRangeAt = function (blockNumber, txIndex, address, start, end, maxLength, cb) {
+  storageRangeAt (blockNumber, txIndex, address, start, end, maxLength, cb) {
     if (cb) {
       cb(null, {})
     }
     return {}
-}
+  }
 
-dummyProvider.prototype.getBlockNumber = function (cb) { cb(null, '') }
+  getBlockNumber (cb) { cb(null, '') }
 
-dummyProvider.prototype.getTransaction = function (txHash, cb) {
+  getTransaction (txHash, cb) {
     if (cb) {
       cb(null, {})
     }
     return {}
-}
+  }
 
-dummyProvider.prototype.getTransactionFromBlock = function (blockNumber, txIndex, cb) {
+  getTransactionFromBlock (blockNumber, txIndex, cb) {
     if (cb) {
       cb(null, {})
     }
     return {}
+  }
 }
-
-module.exports = dummyProvider

libs/remix-lib/src/web3Provider/web3Providers.ts

@@ -1,37 +1,39 @@
-const Web3VMProvider = require('./web3VmProvider')
-const init = require('../init')
+import { Web3VmProvider } from './web3VmProvider'
+import { loadWeb3, extendWeb3 } from '../init'
 
-function Web3Providers () {
+export class Web3Providers {
+
+  modes
+  constructor() {
     this.modes = {}
-}
+  }
 
-Web3Providers.prototype.addProvider = function (type, obj) {
+  addProvider (type, obj) {
     if (type === 'INTERNAL') {
-    const web3 = init.loadWeb3()
+      const web3 = loadWeb3()
       this.addWeb3(type, web3)
     } else if (type === 'vm') {
       this.addVM(type, obj)
     } else {
-    init.extendWeb3(obj)
+      extendWeb3(obj)
       this.addWeb3(type, obj)
     }
-}
+  }
 
-Web3Providers.prototype.get = function (type, cb) {
+  get (type, cb) {
     if (this.modes[type]) {
       return cb(null, this.modes[type])
     }
     cb('error: this provider has not been setup (' + type + ')', null)
-}
+  }
 
-Web3Providers.prototype.addWeb3 = function (type, web3) {
+  addWeb3 (type, web3) {
     this.modes[type] = web3
-}
+  }
 
-Web3Providers.prototype.addVM = function (type, vm) {
-  const vmProvider = new Web3VMProvider()
+  addVM (type, vm) {
+    const vmProvider = new Web3VmProvider()
     vmProvider.setVM(vm)
     this.modes[type] = vmProvider
+  }
 }
-
-module.exports = Web3Providers

libs/remix-lib/src/web3Provider/web3VmProvider.ts

@@ -1,9 +1,39 @@
-const util = require('../util')
-const uiutil = require('../helpers/uiHelper')
-const ethutil = require('ethereumjs-util')
+import { hexConvert, hexListFromBNs, formatMemory } from '../util'
+import { normalizeHexAddress } from '../helpers/uiHelper'
+import { toChecksumAddress, BN, toBuffer, }  from 'ethereumjs-util'
 const Web3 = require('web3')
 
-function web3VmProvider () {
+export class Web3VmProvider {
+
+  web3
+  vm
+  vmTraces
+  txs
+  txsReceipt
+  processingHash
+  processingAddress
+  processingIndex
+  previousDepth
+  incr
+  eth
+  debug
+  providers
+  currentProvider
+  storageCache
+  lastProcessedStorageTxHash
+  sha3Preimages
+  sha3
+  toHex
+  toAscii
+  fromAscii
+  fromDecimal
+  fromWei
+  toWei
+  toBigNumber
+  isAddress
+  utils
+
+  constructor () {
     this.web3 = new Web3()
     this.vm = null
     this.vmTraces = {}
@@ -40,9 +70,9 @@ function web3VmProvider () {
     this.toBigNumber = (...args) => this.web3.utils.toBN(...args)
     this.isAddress = (...args) => this.web3.utils.isAddress(...args)
     this.utils = Web3.utils || []
-}
+  }
 
-web3VmProvider.prototype.setVM = function (vm) {
+  setVM (vm) {
     if (this.vm === vm) return
     this.vm = vm
     this.vm.on('step', (data) => {
@@ -54,49 +84,49 @@ web3VmProvider.prototype.setVM = function (vm) {
     this.vm.on('beforeTx', (data) => {
       this.txWillProcess(this, data)
     })
-}
+  }
 
-web3VmProvider.prototype.releaseCurrentHash = function () {
+  releaseCurrentHash () {
     const ret = this.processingHash
     this.processingHash = undefined
     return ret
-}
+  }
 
-web3VmProvider.prototype.txWillProcess = function (self, data) {
+  txWillProcess (self, data) {
     self.incr++
-  self.processingHash = util.hexConvert(data.hash())
+    self.processingHash = hexConvert(data.hash())
     self.vmTraces[self.processingHash] = {
       gas: '0x0',
       return: '0x0',
       structLogs: []
     }
     let tx = {}
-  tx.hash = self.processingHash
-  tx.from = ethutil.toChecksumAddress(util.hexConvert(data.getSenderAddress()))
+    tx['hash'] = self.processingHash
+    tx['from'] = toChecksumAddress(hexConvert(data.getSenderAddress()))
     if (data.to && data.to.length) {
-    tx.to = ethutil.toChecksumAddress(util.hexConvert(data.to))
+      tx['to'] = toChecksumAddress(hexConvert(data.to))
     }
-  this.processingAddress = tx.to
-  tx.data = util.hexConvert(data.data)
-  tx.input = util.hexConvert(data.input)
-  tx.gas = (new ethutil.BN(util.hexConvert(data.gas).replace('0x', ''), 16)).toString(10)
+    this.processingAddress = tx['to']
+    tx['data'] = hexConvert(data.data)
+    tx['input'] = hexConvert(data.input)
+    tx['gas'] = (new BN(hexConvert(data.gas).replace('0x', ''), 16)).toString(10)
     if (data.value) {
-    tx.value = util.hexConvert(data.value)
+      tx['value'] = hexConvert(data.value)
     }
     self.txs[self.processingHash] = tx
     self.txsReceipt[self.processingHash] = tx
     self.storageCache[self.processingHash] = {}
-  if (tx.to) {
-    const account = ethutil.toBuffer(tx.to)
+    if (tx['to']) {
+      const account = toBuffer(tx['to'])
       self.vm.stateManager.dumpStorage(account, (storage) => {
-      self.storageCache[self.processingHash][tx.to] = storage
-      self.lastProcessedStorageTxHash[tx.to] = self.processingHash
+        self.storageCache[self.processingHash][tx['to']] = storage
+        self.lastProcessedStorageTxHash[tx['to']] = self.processingHash
       })
     }
     this.processingIndex = 0
-}
+  }
 
-web3VmProvider.prototype.txProcessed = function (self, data) {
+  txProcessed (self, data) {
     const lastOp = self.vmTraces[self.processingHash].structLogs[self.processingIndex - 1]
     if (lastOp) {
       lastOp.error = lastOp.op !== 'RETURN' && lastOp.op !== 'STOP' && lastOp.op !== 'SELFDESTRUCT'
@@ -127,20 +157,20 @@ web3VmProvider.prototype.txProcessed = function (self, data) {
     self.txsReceipt[self.processingHash].status = `0x${status}`
 
     if (data.createdAddress) {
-    const address = util.hexConvert(data.createdAddress)
-    self.vmTraces[self.processingHash].return = ethutil.toChecksumAddress(address)
-    self.txsReceipt[self.processingHash].contractAddress = ethutil.toChecksumAddress(address)
+      const address = hexConvert(data.createdAddress)
+      self.vmTraces[self.processingHash].return = toChecksumAddress(address)
+      self.txsReceipt[self.processingHash].contractAddress = toChecksumAddress(address)
     } else if (data.execResult.returnValue) {
-    self.vmTraces[self.processingHash].return = util.hexConvert(data.execResult.returnValue)
+      self.vmTraces[self.processingHash].return = hexConvert(data.execResult.returnValue)
     } else {
       self.vmTraces[self.processingHash].return = '0x'
     }
     this.processingIndex = null
     this.processingAddress = null
     this.previousDepth = 0
-}
+  }
 
-web3VmProvider.prototype.pushTrace = function (self, data) {
+  pushTrace (self, data) {
     const depth = data.depth + 1 // geth starts the depth from 1
     if (!self.processingHash) {
       console.log('no tx processing')
@@ -156,8 +186,8 @@ web3VmProvider.prototype.pushTrace = function (self, data) {
       previousopcode.invalidDepthChange = previousopcode.op !== 'RETURN' && previousopcode.op !== 'STOP'
     }
     const step = {
-    stack: util.hexListFromBNs(data.stack),
-    memory: util.formatMemory(data.memory),
+      stack: hexListFromBNs(data.stack),
+      memory: formatMemory(data.memory),
       storage: data.storage,
       op: data.opcode.name,
       pc: data.pc,
@@ -173,10 +203,10 @@ web3VmProvider.prototype.pushTrace = function (self, data) {
         this.storageCache[this.processingHash][this.processingAddress] = {}
         this.lastProcessedStorageTxHash[this.processingAddress] = this.processingHash
       } else {
-      this.processingAddress = uiutil.normalizeHexAddress(step.stack[step.stack.length - 2])
-      this.processingAddress = ethutil.toChecksumAddress(this.processingAddress)
+        this.processingAddress = normalizeHexAddress(step.stack[step.stack.length - 2])
+        this.processingAddress = toChecksumAddress(this.processingAddress)
         if (!self.storageCache[self.processingHash][this.processingAddress]) {
-        const account = ethutil.toBuffer(this.processingAddress)
+          const account = toBuffer(this.processingAddress)
           self.vm.stateManager.dumpStorage(account, function (storage) {
             self.storageCache[self.processingHash][self.processingAddress] = storage
             self.lastProcessedStorageTxHash[self.processingAddress] = self.processingHash
@@ -185,7 +215,7 @@ web3VmProvider.prototype.pushTrace = function (self, data) {
       }
     }
     if (previousopcode && previousopcode.op === 'SHA3') {
-    const preimage = getSha3Input(previousopcode.stack, previousopcode.memory)
+      const preimage = this.getSha3Input(previousopcode.stack, previousopcode.memory)
       const imageHash = step.stack[step.stack.length - 1].replace('0x', '')
       self.sha3Preimages[imageHash] = {
         'preimage': preimage
@@ -194,19 +224,19 @@ web3VmProvider.prototype.pushTrace = function (self, data) {
 
     this.processingIndex++
     this.previousDepth = depth
-}
+  }
 
-web3VmProvider.prototype.getCode = function (address, cb) {
-  address = ethutil.toChecksumAddress(address)
-  const account = ethutil.toBuffer(address)
+  getCode (address, cb) {
+    address = toChecksumAddress(address)
+    const account = toBuffer(address)
     this.vm.stateManager.getContractCode(account, (error, result) => {
-    cb(error, util.hexConvert(result))
+      cb(error, hexConvert(result))
     })
-}
+  }
 
-web3VmProvider.prototype.setProvider = function (provider) {}
+  setProvider (provider) {}
 
-web3VmProvider.prototype.traceTransaction = function (txHash, options, cb) {
+  traceTransaction (txHash, options, cb) {
     if (this.vmTraces[txHash]) {
       if (cb) {
         cb(null, this.vmTraces[txHash])
@@ -216,11 +246,11 @@ web3VmProvider.prototype.traceTransaction = function (txHash, options, cb) {
     if (cb) {
       cb('unable to retrieve traces ' + txHash, null)
     }
-}
+  }
 
-web3VmProvider.prototype.storageRangeAt = function (blockNumber, txIndex, address, start, maxLength, cb) { // txIndex is the hash in the case of the VM
+  storageRangeAt (blockNumber, txIndex, address, start, maxLength, cb) { // txIndex is the hash in the case of the VM
     // we don't use the range params here
-  address = ethutil.toChecksumAddress(address)
+    address = toChecksumAddress(address)
 
     if (txIndex === 'latest') {
       txIndex = this.lastProcessedStorageTxHash[address]
@@ -234,11 +264,11 @@ web3VmProvider.prototype.storageRangeAt = function (blockNumber, txIndex, addres
       })
     }
     cb('unable to retrieve storage ' + txIndex + ' ' + address)
-}
+  }
 
-web3VmProvider.prototype.getBlockNumber = function (cb) { cb(null, 'vm provider') }
+  getBlockNumber (cb) { cb(null, 'vm provider') }
 
-web3VmProvider.prototype.getTransaction = function (txHash, cb) {
+  getTransaction (txHash, cb) {
     if (this.txs[txHash]) {
       if (cb) {
         cb(null, this.txs[txHash])
@@ -248,9 +278,9 @@ web3VmProvider.prototype.getTransaction = function (txHash, cb) {
     if (cb) {
       cb('unable to retrieve tx ' + txHash, null)
     }
-}
+  }
 
-web3VmProvider.prototype.getTransactionReceipt = function (txHash, cb) {
+  getTransactionReceipt (txHash, cb) {
     // same as getTransaction but return the created address also
     if (this.txsReceipt[txHash]) {
       if (cb) {
@@ -261,49 +291,48 @@ web3VmProvider.prototype.getTransactionReceipt = function (txHash, cb) {
     if (cb) {
       cb('unable to retrieve txReceipt ' + txHash, null)
     }
-}
+  }
 
-web3VmProvider.prototype.getTransactionFromBlock = function (blockNumber, txIndex, cb) {
+  getTransactionFromBlock (blockNumber, txIndex, cb) {
     const mes = 'not supposed to be needed by remix in vmmode'
     console.log(mes)
     if (cb) {
       cb(mes, null)
     }
-}
+  }
 
-web3VmProvider.prototype.preimage = function (hashedKey, cb) {
+  preimage (hashedKey, cb) {
     hashedKey = hashedKey.replace('0x', '')
     cb(null, this.sha3Preimages[hashedKey] !== undefined ? this.sha3Preimages[hashedKey].preimage : null)
-}
+  }
 
-function getSha3Input (stack, memory) {
+  getSha3Input (stack, memory) {
     let memoryStart = stack[stack.length - 1]
     let memoryLength = stack[stack.length - 2]
-  const memStartDec = (new ethutil.BN(memoryStart.replace('0x', ''), 16)).toString(10)
+    const memStartDec = (new BN(memoryStart.replace('0x', ''), 16)).toString(10)
     memoryStart = parseInt(memStartDec) * 2
-  const memLengthDec = (new ethutil.BN(memoryLength.replace('0x', ''), 16).toString(10))
+    const memLengthDec = (new BN(memoryLength.replace('0x', ''), 16).toString(10))
     memoryLength = parseInt(memLengthDec) * 2
 
     let i = Math.floor(memoryStart / 32)
     const maxIndex = Math.floor(memoryLength / 32) + i
     if (!memory[i]) {
-    return emptyFill(memoryLength)
+      return this.emptyFill(memoryLength)
     }
     let sha3Input = memory[i].slice(memoryStart - 32 * i)
     i++
     while (i < maxIndex) {
-    sha3Input += memory[i] ? memory[i] : emptyFill(32)
+      sha3Input += memory[i] ? memory[i] : this.emptyFill(32)
       i++
     }
     if (sha3Input.length < memoryLength) {
       const leftSize = memoryLength - sha3Input.length
-    sha3Input += memory[i] ? memory[i].slice(0, leftSize) : emptyFill(leftSize)
+      sha3Input += memory[i] ? memory[i].slice(0, leftSize) : this.emptyFill(leftSize)
     }
     return sha3Input
-}
+  }
 
-function emptyFill (size) {
+  emptyFill (size) {
     return (new Array(size)).join('0')
+  }
 }
-
-module.exports = web3VmProvider