diff --git a/libs/remix-simulator/src/methods/accounts.js b/libs/remix-simulator/src/methods/accounts.js
index 08d04ac315..c5344c6ad9 100644
--- a/libs/remix-simulator/src/methods/accounts.js
+++ b/libs/remix-simulator/src/methods/accounts.js
@@ -3,125 +3,128 @@ const { BN, privateToAddress, isValidPrivate } = require('ethereumjs-util')
 const Web3 = require('web3')
 const crypto = require('crypto')
 
-const Accounts = function (executionContext) {
-  this.web3 = new Web3()
-  this.executionContext = executionContext
-  // TODO: make it random and/or use remix-libs
-  this.accountsList = [
-    this.web3.eth.accounts.create(['abcd']),
-    this.web3.eth.accounts.create(['ef12']),
-    this.web3.eth.accounts.create(['ef34']),
-    this.web3.eth.accounts.create(['ab12']),
-    this.web3.eth.accounts.create(['ab34']),
-    this.web3.eth.accounts.create(['cd12']),
-    this.web3.eth.accounts.create(['cd34']),
-    this.web3.eth.accounts.create(['bcde']),
-    this.web3.eth.accounts.create(['cdef']),
-    this.web3.eth.accounts.create(['1234'])
-  ]
-  this.accounts = {}
-  this.accountsKeys = {}
-
-  this.executionContext.init({get: () => { return true }})
-}
+class Accounts{
+
+  constructor(executionContext) {
+    this.web3 = new Web3()
+    this.executionContext = executionContext
+    // TODO: make it random and/or use remix-libs
+    this.accountsList = [
+      this.web3.eth.accounts.create(['abcd']),
+      this.web3.eth.accounts.create(['ef12']),
+      this.web3.eth.accounts.create(['ef34']),
+      this.web3.eth.accounts.create(['ab12']),
+      this.web3.eth.accounts.create(['ab34']),
+      this.web3.eth.accounts.create(['cd12']),
+      this.web3.eth.accounts.create(['cd34']),
+      this.web3.eth.accounts.create(['bcde']),
+      this.web3.eth.accounts.create(['cdef']),
+      this.web3.eth.accounts.create(['1234'])
+    ]
+    this.accounts = {}
+    this.accountsKeys = {}
+
+    this.executionContext.init({get: () => { return true }})
+  }
 
-Accounts.prototype.init = async function () {
-  let setBalance = (account) => {
-    return new Promise((resolve, reject) => {
-      this.accountsKeys[ethJSUtil.toChecksumAddress(account.address)] = account.privateKey
-      this.accounts[ethJSUtil.toChecksumAddress(account.address)] = { privateKey: Buffer.from(account.privateKey.replace('0x', ''), 'hex'), nonce: 0 }
-
-      this.executionContext.vm().stateManager.getAccount(Buffer.from(account.address.replace('0x', ''), 'hex'), (err, account) => {
-        if (err) {
-          throw new Error(err)
-        }
-        const balance = '0x56BC75E2D63100000'
-        account.balance = balance || '0xf00000000000000001'
-        resolve()
+  async init () {
+    let setBalance = (account) => {
+      return new Promise((resolve, reject) => {
+        this.accountsKeys[ethJSUtil.toChecksumAddress(account.address)] = account.privateKey
+        this.accounts[ethJSUtil.toChecksumAddress(account.address)] = { privateKey: Buffer.from(account.privateKey.replace('0x', ''), 'hex'), nonce: 0 }
+
+        this.executionContext.vm().stateManager.getAccount(Buffer.from(account.address.replace('0x', ''), 'hex'), (err, account) => {
+          if (err) {
+            throw new Error(err)
+          }
+          const balance = '0x56BC75E2D63100000'
+          account.balance = balance || '0xf00000000000000001'
+          resolve()
+        })
       })
-    })
-  }
+    }
 
-  for (let _account of this.accountsList) {
-    await setBalance(_account)
+    for (let _account of this.accountsList) {
+      await setBalance(_account)
+    }
   }
-}
 
-Accounts.prototype.resetAccounts = function () {
-  // TODO: setting this to {} breaks the app currently, unclear why still
-  // this.accounts = {}
-  // this.accountsKeys = {}
-  this._addAccount('3cd7232cd6f3fc66a57a6bedc1a8ed6c228fff0a327e169c2bcc5e869ed49511', '0x56BC75E2D63100000')
-  this._addAccount('2ac6c190b09897cd8987869cc7b918cfea07ee82038d492abce033c75c1b1d0c', '0x56BC75E2D63100000')
-  this._addAccount('dae9801649ba2d95a21e688b56f77905e5667c44ce868ec83f82e838712a2c7a', '0x56BC75E2D63100000')
-  this._addAccount('d74aa6d18aa79a05f3473dd030a97d3305737cbc8337d940344345c1f6b72eea', '0x56BC75E2D63100000')
-  this._addAccount('71975fbf7fe448e004ac7ae54cad0a383c3906055a65468714156a07385e96ce', '0x56BC75E2D63100000')
-}
+  resetAccounts () {
+    // TODO: setting this to {} breaks the app currently, unclear why still
+    // this.accounts = {}
+    // this.accountsKeys = {}
+    this._addAccount('3cd7232cd6f3fc66a57a6bedc1a8ed6c228fff0a327e169c2bcc5e869ed49511', '0x56BC75E2D63100000')
+    this._addAccount('2ac6c190b09897cd8987869cc7b918cfea07ee82038d492abce033c75c1b1d0c', '0x56BC75E2D63100000')
+    this._addAccount('dae9801649ba2d95a21e688b56f77905e5667c44ce868ec83f82e838712a2c7a', '0x56BC75E2D63100000')
+    this._addAccount('d74aa6d18aa79a05f3473dd030a97d3305737cbc8337d940344345c1f6b72eea', '0x56BC75E2D63100000')
+    this._addAccount('71975fbf7fe448e004ac7ae54cad0a383c3906055a65468714156a07385e96ce', '0x56BC75E2D63100000')
+  }
 
-Accounts.prototype._addAccount = function (privateKey, balance) {
-  privateKey = Buffer.from(privateKey, 'hex')
-  const address = ethJSUtil.privateToAddress(privateKey)
-
-  // FIXME: we don't care about the callback, but we should still make this proper
-  let stateManager = this.executionContext.vm().stateManager
-  stateManager.getAccount(address, (error, account) => {
-    if (error) return console.log(error)
-    account.balance = balance || '0xf00000000000000001'
-    stateManager.putAccount(address, account, (error) => {
-      if (error) console.log(error)
+  _addAccount (privateKey, balance) {
+    privateKey = Buffer.from(privateKey, 'hex')
+    const address = ethJSUtil.privateToAddress(privateKey)
+
+    // FIXME: we don't care about the callback, but we should still make this proper
+    let stateManager = this.executionContext.vm().stateManager
+    stateManager.getAccount(address, (error, account) => {
+      if (error) return console.log(error)
+      account.balance = balance || '0xf00000000000000001'
+      stateManager.putAccount(address, account, (error) => {
+        if (error) console.log(error)
+      })
     })
-  })
 
-  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[ethJSUtil.toChecksumAddress('0x' + address.toString('hex'))] = { privateKey, nonce: 0 }
+    this.accountsKeys[ethJSUtil.toChecksumAddress('0x' + address.toString('hex'))] = '0x' + privateKey.toString('hex')
+  }
 
-Accounts.prototype.newAccount = function (cb) {
-  let privateKey
-  do {
-    privateKey = crypto.randomBytes(32)
-  } while (!isValidPrivate(privateKey))
-  this._addAccount(privateKey, '0x56BC75E2D63100000')
-  return cb(null, '0x' + privateToAddress(privateKey).toString('hex'))
-}
+  newAccount (cb) {
+    let privateKey
+    do {
+      privateKey = crypto.randomBytes(32)
+    } while (!isValidPrivate(privateKey))
+    this._addAccount(privateKey, '0x56BC75E2D63100000')
+    return cb(null, '0x' + privateToAddress(privateKey).toString('hex'))
+  }
 
-Accounts.prototype.methods = function () {
-  return {
-    eth_accounts: this.eth_accounts.bind(this),
-    eth_getBalance: this.eth_getBalance.bind(this),
-    eth_sign: this.eth_sign.bind(this)
+  methods () {
+    return {
+      eth_accounts: this.eth_accounts.bind(this),
+      eth_getBalance: this.eth_getBalance.bind(this),
+      eth_sign: this.eth_sign.bind(this)
+    }
   }
-}
 
-Accounts.prototype.eth_accounts = function (_payload, cb) {
-  return cb(null, Object.keys(this.accounts))
-}
+  eth_accounts (_payload, cb) {
+    return cb(null, Object.keys(this.accounts))
+  }
 
-Accounts.prototype.eth_getBalance = function (payload, cb) {
-  let address = payload.params[0]
-  address = ethJSUtil.stripHexPrefix(address)
+  eth_getBalance (payload, cb) {
+    let address = payload.params[0]
+    address = ethJSUtil.stripHexPrefix(address)
 
-  this.executionContext.vm().stateManager.getAccount(Buffer.from(address, 'hex'), (err, account) => {
-    if (err) {
-      return cb(err)
-    }
-    cb(null, new BN(account.balance).toString(10))
-  })
-}
+    this.executionContext.vm().stateManager.getAccount(Buffer.from(address, 'hex'), (err, account) => {
+      if (err) {
+        return cb(err)
+      }
+      cb(null, new BN(account.balance).toString(10))
+    })
+  }
 
-Accounts.prototype.eth_sign = function (payload, cb) {
-  const address = payload.params[0]
-  const message = payload.params[1]
+  eth_sign (payload, cb) {
+    const address = payload.params[0]
+    const message = payload.params[1]
 
-  const privateKey = this.accountsKeys[ethJSUtil.toChecksumAddress(address)]
-  if (!privateKey) {
-    return cb(new Error('unknown account'))
-  }
-  const account = this.web3.eth.accounts.privateKeyToAccount(privateKey)
+    const privateKey = this.accountsKeys[ethJSUtil.toChecksumAddress(address)]
+    if (!privateKey) {
+      return cb(new Error('unknown account'))
+    }
+    const account = this.web3.eth.accounts.privateKeyToAccount(privateKey)
 
-  const data = account.sign(message)
+    const data = account.sign(message)
 
-  cb(null, data.signature)
+    cb(null, data.signature)
+  }
 }
 
 module.exports = Accounts
diff --git a/package.json b/package.json
index fe1e4c9094..98760f79c0 100644
--- a/package.json
+++ b/package.json
@@ -25,7 +25,7 @@
     "start": "nx start",
     "serve": "nx serve",
     "build": "nx build",
-    "build:tslibs": "nx run-many --target=build --projects=remix-analyzer,remix-astwalker,remix-solidity,remix-tests,remix-url-resolver",
+    "build:libs": "nx run-many --target=build --parallel=false --with-deps=true --projects=remix-analyzer,remix-astwalker,remix-debug,remix-lib,remix-simulator,remix-solidity,remix-tests,remix-url-resolver",
     "test": "nx test",
     "test:libs": "nx run-many --target=test --projects=remix-analyzer,remix-astwalker,remix-debug,remix-lib,remix-simulator,remix-solidity,remix-tests,remix-url-resolver",
     "lint": "nx lint",
diff --git a/tsconfig.json b/tsconfig.json
index e0f201d56f..58b44b5c7a 100644
--- a/tsconfig.json
+++ b/tsconfig.json
@@ -19,7 +19,7 @@
       "@remix-project/remix-analyzer": ["libs/remix-analyzer/index.ts"],
       "@remix-project/remix-astwalker": ["libs/remix-astwalker/src/index.ts"],
       "@remix-project/remix-debug": ["libs/remix-debug/index.js"],
-      "@remix-project/remix-lib": ["dist/libs/remix-lib/index.js"],
+      "@remix-project/remix-lib": ["libs/remix-lib/index.js"],
       "@remix-project/remix-simulator": ["libs/remix-simulator/index.js"],
       "@remix-project/remix-solidity": ["libs/remix-solidity/src/index.ts"],
       "@remix-project/remix-tests": ["libs/remix-tests/src/index.ts"],