diff --git a/libs/remix-lib/src/eventManager.js b/libs/remix-lib/src/eventManager.ts
similarity index 100%
rename from libs/remix-lib/src/eventManager.js
rename to libs/remix-lib/src/eventManager.ts
diff --git a/libs/remix-lib/src/execution/eventsDecoder.js b/libs/remix-lib/src/execution/eventsDecoder.ts
similarity index 98%
rename from libs/remix-lib/src/execution/eventsDecoder.js
rename to libs/remix-lib/src/execution/eventsDecoder.ts
index b524f8e5c2..694b965d2b 100644
--- a/libs/remix-lib/src/execution/eventsDecoder.js
+++ b/libs/remix-lib/src/execution/eventsDecoder.ts
@@ -1,5 +1,5 @@
 'use strict'
-const ethers = require('ethers')
+import { ethers } from 'ethers'
 const txHelper = require('./txHelper')
 
 /**
@@ -7,6 +7,8 @@ const txHelper = require('./txHelper')
   *
   */
 class EventsDecoder {
+  resolveReceipt
+  
   constructor ({resolveReceipt}) {
     this.resolveReceipt = resolveReceipt
   }
diff --git a/libs/remix-lib/src/execution/execution-context.js b/libs/remix-lib/src/execution/execution-context.ts
similarity index 98%
rename from libs/remix-lib/src/execution/execution-context.js
rename to libs/remix-lib/src/execution/execution-context.ts
index d77bca07b9..a026a1d0a5 100644
--- a/libs/remix-lib/src/execution/execution-context.js
+++ b/libs/remix-lib/src/execution/execution-context.ts
@@ -1,6 +1,6 @@
 /* global ethereum */
 'use strict'
-const Web3 = require('web3')
+import Web3 from 'web3'
 const EventManager = require('../eventManager')
 const EthJSVM = require('ethereumjs-vm').default
 const ethUtil = require('ethereumjs-util')
@@ -12,8 +12,8 @@ const LogsManager = require('./logsManager.js')
 const rlp = ethUtil.rlp
 
 let web3
-if (typeof window !== 'undefined' && typeof window.ethereum !== 'undefined') {
-  var injectedProvider = window.ethereum
+if (typeof window !== 'undefined' && typeof window['ethereum'] !== 'undefined') {
+  var injectedProvider = window['ethereum']
   web3 = new Web3(injectedProvider)
 } else {
   web3 = new Web3(new Web3.providers.HttpProvider('http://localhost:8545'))
diff --git a/libs/remix-lib/src/execution/logsManager.js b/libs/remix-lib/src/execution/logsManager.ts
similarity index 100%
rename from libs/remix-lib/src/execution/logsManager.js
rename to libs/remix-lib/src/execution/logsManager.ts
diff --git a/libs/remix-lib/src/execution/txExecution.js b/libs/remix-lib/src/execution/txExecution.ts
similarity index 99%
rename from libs/remix-lib/src/execution/txExecution.js
rename to libs/remix-lib/src/execution/txExecution.ts
index bb89eff5cb..0e4bdb942f 100644
--- a/libs/remix-lib/src/execution/txExecution.js
+++ b/libs/remix-lib/src/execution/txExecution.ts
@@ -1,5 +1,5 @@
 'use strict'
-const ethers = require('ethers')
+import { ethers } from 'ethers'
 
 module.exports = {
   /**
diff --git a/libs/remix-lib/src/execution/txFormat.js b/libs/remix-lib/src/execution/txFormat.ts
similarity index 100%
rename from libs/remix-lib/src/execution/txFormat.js
rename to libs/remix-lib/src/execution/txFormat.ts
diff --git a/libs/remix-lib/src/execution/txHelper.js b/libs/remix-lib/src/execution/txHelper.ts
similarity index 98%
rename from libs/remix-lib/src/execution/txHelper.js
rename to libs/remix-lib/src/execution/txHelper.ts
index fb50c80f50..879377de95 100644
--- a/libs/remix-lib/src/execution/txHelper.js
+++ b/libs/remix-lib/src/execution/txHelper.ts
@@ -1,5 +1,5 @@
 'use strict'
-const ethers = require('ethers')
+import { ethers } from 'ethers'
 
 module.exports = {
   makeFullTypeDefinition: function (typeDef) {
@@ -76,7 +76,7 @@ module.exports = {
       if (abi[i].type === 'constructor') {
         funABI.inputs = abi[i].inputs || []
         funABI.payable = abi[i].payable
-        funABI.stateMutability = abi[i].stateMutability
+        funABI['stateMutability'] = abi[i].stateMutability
         break
       }
     }
diff --git a/libs/remix-lib/src/execution/txListener.js b/libs/remix-lib/src/execution/txListener.ts
similarity index 98%
rename from libs/remix-lib/src/execution/txListener.js
rename to libs/remix-lib/src/execution/txListener.ts
index 06e9b9962a..590fbfe4f8 100644
--- a/libs/remix-lib/src/execution/txListener.js
+++ b/libs/remix-lib/src/execution/txListener.ts
@@ -1,6 +1,6 @@
 'use strict'
-const async = require('async')
-const ethers = require('ethers')
+import async from 'async'
+import { ethers } from 'ethers'
 const ethJSUtil = require('ethereumjs-util')
 const EventManager = require('../eventManager')
 const codeUtil = require('../util')
@@ -28,6 +28,17 @@ function addExecutionCosts(txResult, tx) {
   */
 class TxListener {
 
+  event
+  executionContext
+  _resolvedTransactions
+  _api
+  _resolvedContracts
+  _isListening: boolean
+  _listenOnNetwork:boolean
+  _loopId
+  blocks
+  lastBlock
+
   constructor (opt, executionContext) {
     this.event = new EventManager()
     // has a default for now for backwards compatability
diff --git a/libs/remix-lib/src/execution/txRunner.js b/libs/remix-lib/src/execution/txRunner.ts
similarity index 96%
rename from libs/remix-lib/src/execution/txRunner.js
rename to libs/remix-lib/src/execution/txRunner.ts
index 2ad6fb737e..a4e3e3f588 100644
--- a/libs/remix-lib/src/execution/txRunner.js
+++ b/libs/remix-lib/src/execution/txRunner.ts
@@ -1,12 +1,22 @@
 'use strict'
 const EthJSTX = require('ethereumjs-tx').Transaction
 const EthJSBlock = require('ethereumjs-block')
-const ethJSUtil = require('ethereumjs-util')
-const BN = ethJSUtil.BN
+import { BN } from 'ethereumjs-util'
 const defaultExecutionContext = require('./execution-context')
 const EventManager = require('../eventManager')
 
 class TxRunner {
+
+  event
+  executionContext
+  _api
+  blockNumber
+  runAsync
+  pendingTxs
+  vmaccounts
+  queusTxs
+  blocks
+
   constructor (vmaccounts, api, executionContext) {
     this.event = new EventManager()
     // has a default for now for backwards compatability
@@ -63,7 +73,7 @@ class TxRunner {
           resolve({
             result,
             tx,
-            transactionHash: result ? result.transactionHash : null
+            transactionHash: result ? result['transactionHash'] : null
           })
         })
       }
@@ -167,7 +177,7 @@ class TxRunner {
     const tx = { from: from, to: to, data: data, value: value }
 
     if (useCall) {
-      tx.gas = gasLimit
+      tx['gas'] = gasLimit
       return this.executionContext.web3().eth.call(tx, function (error, result) {
         callback(error, {
           result: result,
@@ -182,7 +192,7 @@ class TxRunner {
       }
       gasEstimationForceSend(err, () => {
         // callback is called whenever no error
-        tx.gas = !gasEstimation ? gasLimit : gasEstimation
+        tx['gas'] = !gasEstimation ? gasLimit : gasEstimation
 
         if (this._api.config.getUnpersistedProperty('doNotShowTransactionConfirmationAgain')) {
           return this._executeTx(tx, null, this._api, promptCb, callback)
@@ -194,7 +204,7 @@ class TxRunner {
             return
           }
 
-          confirmCb(network, tx, tx.gas, (gasPrice) => {
+          confirmCb(network, tx, tx['gas'], (gasPrice) => {
             return this._executeTx(tx, gasPrice, this._api, promptCb, callback)
           }, (error) => {
             callback(error)
@@ -248,7 +258,7 @@ async function tryTillTxAvailable (txhash, executionContext) {
 
 async function pause () { return new Promise((resolve, reject) => { setTimeout(resolve, 500) }) }
 
-function run(self, tx, stamp, confirmationCb, gasEstimationForceSend, promptCb, callback) {
+function run(self, tx, stamp, confirmationCb, gasEstimationForceSend = null, promptCb = null, callback = null) {
   if (!self.runAsync && Object.keys(self.pendingTxs).length) {
     return self.queusTxs.push({ tx, stamp, callback })
   }
diff --git a/libs/remix-lib/src/execution/typeConversion.js b/libs/remix-lib/src/execution/typeConversion.ts
similarity index 100%
rename from libs/remix-lib/src/execution/typeConversion.js
rename to libs/remix-lib/src/execution/typeConversion.ts
diff --git a/libs/remix-lib/src/helpers/compilerHelper.js b/libs/remix-lib/src/helpers/compilerHelper.ts
similarity index 100%
rename from libs/remix-lib/src/helpers/compilerHelper.js
rename to libs/remix-lib/src/helpers/compilerHelper.ts
diff --git a/libs/remix-lib/src/helpers/txResultHelper.js b/libs/remix-lib/src/helpers/txResultHelper.ts
similarity index 100%
rename from libs/remix-lib/src/helpers/txResultHelper.js
rename to libs/remix-lib/src/helpers/txResultHelper.ts
diff --git a/libs/remix-lib/src/helpers/uiHelper.js b/libs/remix-lib/src/helpers/uiHelper.ts
similarity index 100%
rename from libs/remix-lib/src/helpers/uiHelper.js
rename to libs/remix-lib/src/helpers/uiHelper.ts
diff --git a/libs/remix-lib/src/init.js b/libs/remix-lib/src/init.ts
similarity index 100%
rename from libs/remix-lib/src/init.js
rename to libs/remix-lib/src/init.ts
diff --git a/libs/remix-lib/src/storage.js b/libs/remix-lib/src/storage.ts
similarity index 100%
rename from libs/remix-lib/src/storage.js
rename to libs/remix-lib/src/storage.ts
diff --git a/libs/remix-lib/src/universalDapp.js b/libs/remix-lib/src/universalDapp.ts
similarity index 100%
rename from libs/remix-lib/src/universalDapp.js
rename to libs/remix-lib/src/universalDapp.ts
diff --git a/libs/remix-lib/src/util.js b/libs/remix-lib/src/util.ts
similarity index 95%
rename from libs/remix-lib/src/util.js
rename to libs/remix-lib/src/util.ts
index 8fcf7a32c7..97b792d147 100644
--- a/libs/remix-lib/src/util.js
+++ b/libs/remix-lib/src/util.ts
@@ -1,5 +1,5 @@
 'use strict'
-const ethutil = require('ethereumjs-util')
+import { BN, bufferToHex, keccak, setLengthLeft } from 'ethereumjs-util'
 
 /*
  contains misc util: @TODO should be splitted
@@ -48,10 +48,10 @@ module.exports = {
     const ret = []
     for (let k in bnList) {
       const v = bnList[k]
-      if (ethutil.BN.isBN(v)) {
+      if (BN.isBN(v)) {
         ret.push('0x' + v.toString('hex', 64))
       } else {
-        ret.push('0x' + (new ethutil.BN(v)).toString('hex', 64)) // TEMP FIX TO REMOVE ONCE https://github.com/ethereumjs/ethereumjs-vm/pull/293 is released
+        ret.push('0x' + (new BN(v)).toString('hex', 64)) // TEMP FIX TO REMOVE ONCE https://github.com/ethereumjs/ethereumjs-vm/pull/293 is released
       }
     }
     return ret
@@ -161,9 +161,9 @@ module.exports = {
     if (typeof value === 'string' && value.indexOf('0x') !== 0) {
       value = '0x' + value
     }
-    let ret = ethutil.bufferToHex(ethutil.setLengthLeft(value, 32))
-    ret = ethutil.keccak(ret)
-    return ethutil.bufferToHex(ret)
+    let ret: any = bufferToHex(setLengthLeft(value, 32))
+    ret = keccak(ret)
+    return bufferToHex(ret)
   },
 
   /**
diff --git a/libs/remix-lib/src/web3Provider/dummyProvider.js b/libs/remix-lib/src/web3Provider/dummyProvider.ts
similarity index 100%
rename from libs/remix-lib/src/web3Provider/dummyProvider.js
rename to libs/remix-lib/src/web3Provider/dummyProvider.ts
diff --git a/libs/remix-lib/src/web3Provider/web3Providers.js b/libs/remix-lib/src/web3Provider/web3Providers.ts
similarity index 100%
rename from libs/remix-lib/src/web3Provider/web3Providers.js
rename to libs/remix-lib/src/web3Provider/web3Providers.ts
diff --git a/libs/remix-lib/src/web3Provider/web3VmProvider.js b/libs/remix-lib/src/web3Provider/web3VmProvider.ts
similarity index 100%
rename from libs/remix-lib/src/web3Provider/web3VmProvider.js
rename to libs/remix-lib/src/web3Provider/web3VmProvider.ts