diff --git a/libs/remix-simulator/index.js b/libs/remix-simulator/index.js
deleted file mode 100644
index 3ce817f94e..0000000000
--- a/libs/remix-simulator/index.js
+++ /dev/null
@@ -1,5 +0,0 @@
-const Provider = require('./src/provider')
-
-module.exports = {
-  Provider: Provider
-}
diff --git a/libs/remix-simulator/src/genesis.js b/libs/remix-simulator/src/genesis.ts
similarity index 100%
rename from libs/remix-simulator/src/genesis.js
rename to libs/remix-simulator/src/genesis.ts
diff --git a/libs/remix-simulator/src/index.ts b/libs/remix-simulator/src/index.ts
new file mode 100644
index 0000000000..1645bcca00
--- /dev/null
+++ b/libs/remix-simulator/src/index.ts
@@ -0,0 +1,3 @@
+import {Provider} from './provider'
+
+export { Provider }
diff --git a/libs/remix-simulator/src/methods/accounts.js b/libs/remix-simulator/src/methods/accounts.ts
similarity index 85%
rename from libs/remix-simulator/src/methods/accounts.js
rename to libs/remix-simulator/src/methods/accounts.ts
index ba019dac66..95edbb4c38 100644
--- a/libs/remix-simulator/src/methods/accounts.js
+++ b/libs/remix-simulator/src/methods/accounts.ts
@@ -1,9 +1,14 @@
-const ethJSUtil = require('ethereumjs-util')
-const { BN, privateToAddress, isValidPrivate } = require('ethereumjs-util')
-const Web3 = require('web3')
-const crypto = require('crypto')
+import { BN, privateToAddress, toChecksumAddress, isValidPrivate} from 'ethereumjs-util'
+import { stripHexPrefix } from 'ethjs-util'
+import Web3 from 'web3'
+import * as crypto from 'crypto'
 
-class Accounts{
+export class Accounts {
+
+  web3
+  accounts
+  accountsKeys
+  executionContext
 
   constructor(executionContext) {
     this.web3 = new Web3()
@@ -39,10 +44,10 @@ class Accounts{
   _addAccount (privateKey, balance) {
     return new Promise((resolve, reject) => {
       privateKey = Buffer.from(privateKey, 'hex')
-      const address = ethJSUtil.privateToAddress(privateKey)
+      const address = privateToAddress(privateKey)
 
-      this.accounts[ethJSUtil.toChecksumAddress('0x' + address.toString('hex'))] = { privateKey, nonce: 0 }
-      this.accountsKeys[ethJSUtil.toChecksumAddress('0x' + address.toString('hex'))] = '0x' + privateKey.toString('hex')
+      this.accounts[toChecksumAddress('0x' + address.toString('hex'))] = { privateKey, nonce: 0 }
+      this.accountsKeys[toChecksumAddress('0x' + address.toString('hex'))] = '0x' + privateKey.toString('hex')
 
       let stateManager = this.executionContext.vm().stateManager
       stateManager.getAccount(address, (error, account) => {
@@ -81,7 +86,7 @@ class Accounts{
 
   eth_getBalance (payload, cb) {
     let address = payload.params[0]
-    address = ethJSUtil.stripHexPrefix(address)
+    address = stripHexPrefix(address)
 
     this.executionContext.vm().stateManager.getAccount(Buffer.from(address, 'hex'), (err, account) => {
       if (err) {
@@ -95,7 +100,7 @@ class Accounts{
     const address = payload.params[0]
     const message = payload.params[1]
 
-    const privateKey = this.accountsKeys[ethJSUtil.toChecksumAddress(address)]
+    const privateKey = this.accountsKeys[toChecksumAddress(address)]
     if (!privateKey) {
       return cb(new Error('unknown account'))
     }
@@ -105,6 +110,4 @@ class Accounts{
 
     cb(null, data.signature)
   }
-}
-
-module.exports = Accounts
\ No newline at end of file
+}
\ No newline at end of file
diff --git a/libs/remix-simulator/src/methods/blocks.js b/libs/remix-simulator/src/methods/blocks.ts
similarity index 97%
rename from libs/remix-simulator/src/methods/blocks.js
rename to libs/remix-simulator/src/methods/blocks.ts
index 2b8d80191c..ce137a0d5e 100644
--- a/libs/remix-simulator/src/methods/blocks.js
+++ b/libs/remix-simulator/src/methods/blocks.ts
@@ -1,4 +1,9 @@
-class Blocks {
+export class Blocks {
+
+  executionContext
+  coinbase
+  blockNumber
+
   constructor (executionContext, _options) {
     this.executionContext = executionContext
     const options = _options || {}
@@ -130,10 +135,8 @@ class Blocks {
         return cb(err, '')
       }
 
-      let value = Object.values(result.storage)[0].value
+      let value = Object.values(result.storage)[0]['value']
       cb(err, value)
     })
   }
-}
-
-module.exports = Blocks
\ No newline at end of file
+}
\ No newline at end of file
diff --git a/libs/remix-simulator/src/methods/debug.js b/libs/remix-simulator/src/methods/debug.ts
similarity index 95%
rename from libs/remix-simulator/src/methods/debug.js
rename to libs/remix-simulator/src/methods/debug.ts
index 77946fea77..060878f921 100644
--- a/libs/remix-simulator/src/methods/debug.js
+++ b/libs/remix-simulator/src/methods/debug.ts
@@ -1,4 +1,7 @@
-class Debug {
+export class Debug {
+
+  executionContext
+
   constructor (executionContext) {
     this.executionContext = executionContext
   }
@@ -29,5 +32,3 @@ class Debug {
       cb)
   }
 }
-
-module.exports = Debug
diff --git a/libs/remix-simulator/src/methods/filters.js b/libs/remix-simulator/src/methods/filters.ts
similarity index 97%
rename from libs/remix-simulator/src/methods/filters.js
rename to libs/remix-simulator/src/methods/filters.ts
index b9aaf73a82..dba83cd3d6 100644
--- a/libs/remix-simulator/src/methods/filters.js
+++ b/libs/remix-simulator/src/methods/filters.ts
@@ -1,4 +1,7 @@
-class Filters { 
+export class Filters { 
+
+  executionContext
+
   constructor(executionContext) {
     this.executionContext = executionContext
   }
@@ -58,5 +61,3 @@ class Filters {
     cb(null, results)
   }
 }
-
-module.exports = Filters
\ No newline at end of file
diff --git a/libs/remix-simulator/src/methods/misc.js b/libs/remix-simulator/src/methods/misc.ts
similarity index 100%
rename from libs/remix-simulator/src/methods/misc.js
rename to libs/remix-simulator/src/methods/misc.ts
diff --git a/libs/remix-simulator/src/methods/net.js b/libs/remix-simulator/src/methods/net.ts
similarity index 100%
rename from libs/remix-simulator/src/methods/net.js
rename to libs/remix-simulator/src/methods/net.ts
diff --git a/libs/remix-simulator/src/methods/transactions.js b/libs/remix-simulator/src/methods/transactions.ts
similarity index 93%
rename from libs/remix-simulator/src/methods/transactions.js
rename to libs/remix-simulator/src/methods/transactions.ts
index 7d0f5e46d4..176583df27 100644
--- a/libs/remix-simulator/src/methods/transactions.js
+++ b/libs/remix-simulator/src/methods/transactions.ts
@@ -1,9 +1,11 @@
-const Web3 = require('web3')
-const ethJSUtil = require('ethereumjs-util')
-const processTx = require('./txProcess.js')
-const BN = ethJSUtil.BN
+import Web3 from 'web3'
+import { toChecksumAddress, BN } from 'ethereumjs-util'
+import { processTx } from './txProcess'
 
 class Transactions{
+
+  executionContext
+  accounts
   
   constructor(executionContext) {
     this.executionContext = executionContext
@@ -30,7 +32,7 @@ class Transactions{
   eth_sendTransaction (payload, cb) {
     // from might be lowercased address (web3)
     if (payload.params && payload.params.length > 0 && payload.params[0].from) {
-      payload.params[0].from = ethJSUtil.toChecksumAddress(payload.params[0].from)
+      payload.params[0].from = toChecksumAddress(payload.params[0].from)
     }
     processTx(this.executionContext, this.accounts, payload, false, cb)
   }
@@ -83,10 +85,10 @@ class Transactions{
   eth_call (payload, cb) {
     // from might be lowercased address (web3)
     if (payload.params && payload.params.length > 0 && payload.params[0].from) {
-      payload.params[0].from = ethJSUtil.toChecksumAddress(payload.params[0].from)
+      payload.params[0].from = toChecksumAddress(payload.params[0].from)
     }
     if (payload.params && payload.params.length > 0 && payload.params[0].to) {
-      payload.params[0].to = ethJSUtil.toChecksumAddress(payload.params[0].to)
+      payload.params[0].to = toChecksumAddress(payload.params[0].to)
     }
 
     payload.params[0].value = undefined
@@ -136,7 +138,7 @@ class Transactions{
       }
 
       if (receipt.to) {
-        r.to = receipt.to
+        r['to'] = receipt.to
       }
 
       if (r.value === '0x') {
@@ -182,7 +184,7 @@ class Transactions{
       }
 
       if (receipt.to) {
-        r.to = receipt.to
+        r['to'] = receipt.to
       }
 
       if (r.value === '0x') {
@@ -224,7 +226,7 @@ class Transactions{
       }
 
       if (receipt.to) {
-        r.to = receipt.to
+        r['to'] = receipt.to
       }
 
       if (r.value === '0x') {
@@ -234,6 +236,4 @@ class Transactions{
       cb(null, r)
     })
   }
-}
-
-module.exports = Transactions
\ No newline at end of file
+}
\ No newline at end of file
diff --git a/libs/remix-simulator/src/methods/txProcess.js b/libs/remix-simulator/src/methods/txProcess.ts
similarity index 96%
rename from libs/remix-simulator/src/methods/txProcess.js
rename to libs/remix-simulator/src/methods/txProcess.ts
index d1b177eef0..2dcb582740 100644
--- a/libs/remix-simulator/src/methods/txProcess.js
+++ b/libs/remix-simulator/src/methods/txProcess.ts
@@ -39,7 +39,7 @@ function createContract (payload, from, data, value, gasLimit, txRunner, callbac
 
 let txRunnerInstance
 
-function processTx (executionContext, accounts, payload, isCall, callback) {
+export function processTx (executionContext, accounts, payload, isCall, callback) {
   const api = {
     logMessage: (msg) => {
     },
@@ -94,5 +94,3 @@ function processTx (executionContext, accounts, payload, isCall, callback) {
     createContract(payload, from, data, value, gas, txRunnerInstance, callbacks, callback)
   }
 }
-
-module.exports = processTx
diff --git a/libs/remix-simulator/src/provider.js b/libs/remix-simulator/src/provider.ts
similarity index 94%
rename from libs/remix-simulator/src/provider.js
rename to libs/remix-simulator/src/provider.ts
index f9d1d68fba..381290d99f 100644
--- a/libs/remix-simulator/src/provider.js
+++ b/libs/remix-simulator/src/provider.ts
@@ -5,7 +5,7 @@ const log = require('./utils/logs.js')
 const merge = require('merge')
 
 const Accounts = require('./methods/accounts.js')
-const Blocks = require('./methods/blocks.js')
+import { Blocks } from './methods/blocks'
 const Filters = require('./methods/filters.js')
 const Misc = require('./methods/misc.js')
 const Net = require('./methods/net.js')
@@ -14,7 +14,14 @@ const Debug = require('./methods/debug.js')
 
 const generateBlock = require('./genesis.js')
 
-class Provider { 
+export class Provider {
+
+  options
+  executionContext
+  Accounts
+  Transactions
+  methods
+
   constructor(options = {}) {
     this.options = options
     // TODO: init executionContext here
@@ -74,6 +81,4 @@ class Provider {
   on (type, cb) {
     this.executionContext.logsManager.addListener(type, cb)
   }
-}
-
-module.exports = Provider
\ No newline at end of file
+}
\ No newline at end of file
diff --git a/libs/remix-simulator/src/server.js b/libs/remix-simulator/src/server.ts
similarity index 100%
rename from libs/remix-simulator/src/server.js
rename to libs/remix-simulator/src/server.ts
diff --git a/libs/remix-simulator/src/utils/logs.js b/libs/remix-simulator/src/utils/logs.ts
similarity index 100%
rename from libs/remix-simulator/src/utils/logs.js
rename to libs/remix-simulator/src/utils/logs.ts
diff --git a/libs/remix-simulator/test/accounts.js b/libs/remix-simulator/test/accounts.ts
similarity index 100%
rename from libs/remix-simulator/test/accounts.js
rename to libs/remix-simulator/test/accounts.ts
diff --git a/libs/remix-simulator/test/blocks.js b/libs/remix-simulator/test/blocks.ts
similarity index 100%
rename from libs/remix-simulator/test/blocks.js
rename to libs/remix-simulator/test/blocks.ts
diff --git a/libs/remix-simulator/test/misc.js b/libs/remix-simulator/test/misc.ts
similarity index 100%
rename from libs/remix-simulator/test/misc.js
rename to libs/remix-simulator/test/misc.ts
diff --git a/libs/remix-simulator/tsconfig.json b/libs/remix-simulator/tsconfig.json
new file mode 100644
index 0000000000..4f27566be2
--- /dev/null
+++ b/libs/remix-simulator/tsconfig.json
@@ -0,0 +1,7 @@
+{
+    "extends": "../../tsconfig.json",
+    "compilerOptions": {
+      "types": ["node"]
+    },
+    "include": ["**/*.ts"]
+  }
\ No newline at end of file
diff --git a/libs/remix-simulator/tsconfig.lib.json b/libs/remix-simulator/tsconfig.lib.json
index 35b63e23e8..463da90b45 100644
--- a/libs/remix-simulator/tsconfig.lib.json
+++ b/libs/remix-simulator/tsconfig.lib.json
@@ -1,18 +1,14 @@
 {
-    "extends": "../../tsconfig.json",
-    "compilerOptions": {
-      "module": "commonjs",
-      "outDir": "../../dist/out-tsc",
-      "allowJs": true,
-      "declaration": true,
-      "rootDir": "./",
-      "types": ["node"]
-    },
-    "exclude": ["**/*.spec.js"],
-    "include": [
-        "src/**/*.js",
-        "./index.js",
-        "bin/"
-    ]
-  }
-  
\ No newline at end of file
+  "extends": "./tsconfig.json",
+  "compilerOptions": {
+    "module": "commonjs",
+    "outDir": "../../dist/out-tsc",
+    "declaration": true,
+    "rootDir": "./src",
+    "types": ["node"]
+  },
+  "exclude": [
+    "**/*.spec.ts"
+  ],
+  "include": ["**/*.ts"]
+}