diff --git a/libs/remix-debug/src/code/codeManager.ts b/libs/remix-debug/src/code/codeManager.ts
index 77d9f3768d..da23851bb4 100644
--- a/libs/remix-debug/src/code/codeManager.ts
+++ b/libs/remix-debug/src/code/codeManager.ts
@@ -3,7 +3,7 @@
 const EventManager = require('../eventManager')
 const traceHelper = require('../trace/traceHelper')
 const SourceMappingDecoder = require('../source/sourceMappingDecoder')
-const CodeResolver = require('./codeResolver')
+import { CodeResolver } from './codeResolver'
 
 /*
   resolve contract code referenced by vmtrace in order to be used by asm listview.
diff --git a/libs/remix-debug/src/code/codeResolver.ts b/libs/remix-debug/src/code/codeResolver.ts
index 0e30c2af42..dc7945b747 100644
--- a/libs/remix-debug/src/code/codeResolver.ts
+++ b/libs/remix-debug/src/code/codeResolver.ts
@@ -1,5 +1,5 @@
 'use strict'
-const codeUtils = require('./codeUtils')
+import  { nameOpCodes } from './codeUtils'
 
 export class CodeResolver {
 
@@ -40,7 +40,7 @@ export class CodeResolver {
   }
 
   formatCode (hexCode) {
-    const [code, instructionsIndexByBytesOffset] = codeUtils.nameOpCodes(Buffer.from(hexCode.substring(2), 'hex'))
+    const [code, instructionsIndexByBytesOffset] = nameOpCodes(Buffer.from(hexCode.substring(2), 'hex'))
     return {code, instructionsIndexByBytesOffset}
   }
 
diff --git a/libs/remix-debug/src/code/codeUtils.ts b/libs/remix-debug/src/code/codeUtils.ts
index 577f717b7c..38c7ff87ff 100644
--- a/libs/remix-debug/src/code/codeUtils.ts
+++ b/libs/remix-debug/src/code/codeUtils.ts
@@ -1,5 +1,5 @@
 'use strict'
-const opcodes = require('./opcodes')
+import opcodes from './opcodes'
 
 export function nameOpCodes (raw) {
   let pushData = ''
@@ -35,11 +35,11 @@ export function parseCode (raw) {
     const opcode = opcodes(raw[i], true)
     if (opcode.name.slice(0, 4) === 'PUSH') {
       const length = raw[i] - 0x5f
-      opcode.pushData = raw.slice(i + 1, i + length + 1)
+      opcode['pushData'] = raw.slice(i + 1, i + length + 1)
       // in case pushdata extends beyond code
       if (i + 1 + length > raw.length) {
-        for (let j = opcode.pushData.length; j < length; j++) {
-          opcode.pushData.push(0)
+        for (let j = opcode['pushData'].length; j < length; j++) {
+          opcode['pushData'].push(0)
         }
       }
       i += length
diff --git a/libs/remix-debug/src/code/disassembler.ts b/libs/remix-debug/src/code/disassembler.ts
index 6c0668c59c..f9524bb482 100644
--- a/libs/remix-debug/src/code/disassembler.ts
+++ b/libs/remix-debug/src/code/disassembler.ts
@@ -1,10 +1,9 @@
 'use strict'
 
-const parseCode = require('./codeUtils').parseCode
-const remixLib = require('@remix-project/remix-lib')
-const util = remixLib.util
+import { parseCode } from './codeUtils'
+import { util } from '@remix-project/remix-lib'
 
-const createExpressions = function (instructions) {
+function createExpressions (instructions) {
   const expressions = []
   let labels = 0
   for (let i = 0; i < instructions.length; i++) {
@@ -35,7 +34,7 @@ const createExpressions = function (instructions) {
   return expressions
 }
 
-const toString = function (expr) {
+function toString (expr) {
   if (expr.name.slice(0, 4) === 'PUSH') {
     return util.hexConvert(expr.pushData)
   } else if (expr.name === 'JUMPDEST') {
@@ -46,14 +45,10 @@ const toString = function (expr) {
   return expr.name.toLowerCase()
 }
 
-const disassemble = function (input) {
-  const code = parseCode(util.hexToIntArray(input))
-  return createExpressions(code).map(toString).join('\n')
-}
-
-module.exports = {
- /**
+/**
   * Disassembler that turns bytecode (as a hex string) into Solidity inline assembly.
   */
-  disassemble: disassemble
+export function disassemble (input) {
+  const code = parseCode(util.hexToIntArray(input))
+  return createExpressions(code).map(toString).join('\n')
 }
diff --git a/libs/remix-debug/src/code/opcodes.ts b/libs/remix-debug/src/code/opcodes.ts
index 8c841c2fc6..4cd17a3a56 100644
--- a/libs/remix-debug/src/code/opcodes.ts
+++ b/libs/remix-debug/src/code/opcodes.ts
@@ -1,173 +1,173 @@
 'use strict'
-const codes = {
-  // 0x0 range - arithmetic ops
-  // name, baseCost, off stack, on stack, dynamic, async
-  // @todo can be improved on basis of this: https://github.com/ethereumjs/ethereumjs-vm/blob/master/lib/evm/opcodes.ts
-
-  0x00: ['STOP', 0, 0, 0, false],
-  0x01: ['ADD', 3, 2, 1, false],
-  0x02: ['MUL', 5, 2, 1, false],
-  0x03: ['SUB', 3, 2, 1, false],
-  0x04: ['DIV', 5, 2, 1, false],
-  0x05: ['SDIV', 5, 2, 1, false],
-  0x06: ['MOD', 5, 2, 1, false],
-  0x07: ['SMOD', 5, 2, 1, false],
-  0x08: ['ADDMOD', 8, 3, 1, false],
-  0x09: ['MULMOD', 8, 3, 1, false],
-  0x0a: ['EXP', 10, 2, 1, false],
-  0x0b: ['SIGNEXTEND', 5, 2, 1, false],
-
-  // 0x10 range - bit ops
-  0x10: ['LT', 3, 2, 1, false],
-  0x11: ['GT', 3, 2, 1, false],
-  0x12: ['SLT', 3, 2, 1, false],
-  0x13: ['SGT', 3, 2, 1, false],
-  0x14: ['EQ', 3, 2, 1, false],
-  0x15: ['ISZERO', 3, 1, 1, false],
-  0x16: ['AND', 3, 2, 1, false],
-  0x17: ['OR', 3, 2, 1, false],
-  0x18: ['XOR', 3, 2, 1, false],
-  0x19: ['NOT', 3, 1, 1, false],
-  0x1a: ['BYTE', 3, 2, 1, false],
-  0x1b: ['SHL', 3, 2, 1, false],
-  0x1c: ['SHR', 3, 2, 1, false],
-  0x1d: ['SAR', 3, 2, 1, false],
-
-  // 0x20 range - crypto
-  0x20: ['SHA3', 30, 2, 1, false],
-
-  // 0x30 range - closure state
-  0x30: ['ADDRESS', 2, 0, 1, true],
-  0x31: ['BALANCE', 700, 1, 1, true, true],
-  0x32: ['ORIGIN', 2, 0, 1, true],
-  0x33: ['CALLER', 2, 0, 1, true],
-  0x34: ['CALLVALUE', 2, 0, 1, true],
-  0x35: ['CALLDATALOAD', 3, 1, 1, true],
-  0x36: ['CALLDATASIZE', 2, 0, 1, true],
-  0x37: ['CALLDATACOPY', 3, 3, 0, true],
-  0x38: ['CODESIZE', 2, 0, 1, false],
-  0x39: ['CODECOPY', 3, 3, 0, false],
-  0x3a: ['GASPRICE', 2, 0, 1, false],
-  0x3b: ['EXTCODESIZE', 700, 1, 1, true, true],
-  0x3c: ['EXTCODECOPY', 700, 4, 0, true, true],
-  0x3d: ['RETURNDATASIZE', 2, 0, 1, true],
-  0x3e: ['RETURNDATACOPY', 3, 3, 0, true],
-  0x3f: ['EXTCODEHASH', 400, 3, 0, true],
-
-  // '0x40' range - block operations
-  0x40: ['BLOCKHASH', 20, 1, 1, true, true],
-  0x41: ['COINBASE', 2, 0, 1, true],
-  0x42: ['TIMESTAMP', 2, 0, 1, true],
-  0x43: ['NUMBER', 2, 0, 1, true],
-  0x44: ['DIFFICULTY', 2, 0, 1, true],
-  0x45: ['GASLIMIT', 2, 0, 1, true],
-  0x46: ['CHAINID', 2, 0, 1, false],
-  0x47: ['SELFBALANCE', 5, 0, 1, false],
-
-  // 0x50 range - 'storage' and execution
-  0x50: ['POP', 2, 1, 0, false],
-  0x51: ['MLOAD', 3, 1, 1, false],
-  0x52: ['MSTORE', 3, 2, 0, false],
-  0x53: ['MSTORE8', 3, 2, 0, false],
-  0x54: ['SLOAD', 800, 1, 1, true, true],
-  0x55: ['SSTORE', 0, 2, 0, true, true],
-  0x56: ['JUMP', 8, 1, 0, false],
-  0x57: ['JUMPI', 10, 2, 0, false],
-  0x58: ['PC', 2, 0, 1, false],
-  0x59: ['MSIZE', 2, 0, 1, false],
-  0x5a: ['GAS', 2, 0, 1, false],
-  0x5b: ['JUMPDEST', 1, 0, 0, false],
-
-  // 0x60, range
-  0x60: ['PUSH1', 3, 0, 1, false],
-  0x61: ['PUSH2', 3, 0, 1, false],
-  0x62: ['PUSH3', 3, 0, 1, false],
-  0x63: ['PUSH4', 3, 0, 1, false],
-  0x64: ['PUSH5', 3, 0, 1, false],
-  0x65: ['PUSH6', 3, 0, 1, false],
-  0x66: ['PUSH7', 3, 0, 1, false],
-  0x67: ['PUSH8', 3, 0, 1, false],
-  0x68: ['PUSH9', 3, 0, 1, false],
-  0x69: ['PUSH10', 3, 0, 1, false],
-  0x6a: ['PUSH11', 3, 0, 1, false],
-  0x6b: ['PUSH12', 3, 0, 1, false],
-  0x6c: ['PUSH13', 3, 0, 1, false],
-  0x6d: ['PUSH14', 3, 0, 1, false],
-  0x6e: ['PUSH15', 3, 0, 1, false],
-  0x6f: ['PUSH16', 3, 0, 1, false],
-  0x70: ['PUSH17', 3, 0, 1, false],
-  0x71: ['PUSH18', 3, 0, 1, false],
-  0x72: ['PUSH19', 3, 0, 1, false],
-  0x73: ['PUSH20', 3, 0, 1, false],
-  0x74: ['PUSH21', 3, 0, 1, false],
-  0x75: ['PUSH22', 3, 0, 1, false],
-  0x76: ['PUSH23', 3, 0, 1, false],
-  0x77: ['PUSH24', 3, 0, 1, false],
-  0x78: ['PUSH25', 3, 0, 1, false],
-  0x79: ['PUSH26', 3, 0, 1, false],
-  0x7a: ['PUSH27', 3, 0, 1, false],
-  0x7b: ['PUSH28', 3, 0, 1, false],
-  0x7c: ['PUSH29', 3, 0, 1, false],
-  0x7d: ['PUSH30', 3, 0, 1, false],
-  0x7e: ['PUSH31', 3, 0, 1, false],
-  0x7f: ['PUSH32', 3, 0, 1, false],
-
-  0x80: ['DUP1', 3, 0, 1, false],
-  0x81: ['DUP2', 3, 0, 1, false],
-  0x82: ['DUP3', 3, 0, 1, false],
-  0x83: ['DUP4', 3, 0, 1, false],
-  0x84: ['DUP5', 3, 0, 1, false],
-  0x85: ['DUP6', 3, 0, 1, false],
-  0x86: ['DUP7', 3, 0, 1, false],
-  0x87: ['DUP8', 3, 0, 1, false],
-  0x88: ['DUP9', 3, 0, 1, false],
-  0x89: ['DUP10', 3, 0, 1, false],
-  0x8a: ['DUP11', 3, 0, 1, false],
-  0x8b: ['DUP12', 3, 0, 1, false],
-  0x8c: ['DUP13', 3, 0, 1, false],
-  0x8d: ['DUP14', 3, 0, 1, false],
-  0x8e: ['DUP15', 3, 0, 1, false],
-  0x8f: ['DUP16', 3, 0, 1, false],
-
-  0x90: ['SWAP1', 3, 0, 0, false],
-  0x91: ['SWAP2', 3, 0, 0, false],
-  0x92: ['SWAP3', 3, 0, 0, false],
-  0x93: ['SWAP4', 3, 0, 0, false],
-  0x94: ['SWAP5', 3, 0, 0, false],
-  0x95: ['SWAP6', 3, 0, 0, false],
-  0x96: ['SWAP7', 3, 0, 0, false],
-  0x97: ['SWAP8', 3, 0, 0, false],
-  0x98: ['SWAP9', 3, 0, 0, false],
-  0x99: ['SWAP10', 3, 0, 0, false],
-  0x9a: ['SWAP11', 3, 0, 0, false],
-  0x9b: ['SWAP12', 3, 0, 0, false],
-  0x9c: ['SWAP13', 3, 0, 0, false],
-  0x9d: ['SWAP14', 3, 0, 0, false],
-  0x9e: ['SWAP15', 3, 0, 0, false],
-  0x9f: ['SWAP16', 3, 0, 0, false],
-
-  0xa0: ['LOG0', 375, 2, 0, false],
-  0xa1: ['LOG1', 375, 3, 0, false],
-  0xa2: ['LOG2', 375, 4, 0, false],
-  0xa3: ['LOG3', 375, 5, 0, false],
-  0xa4: ['LOG4', 375, 6, 0, false],
-
-  // '0xf0' range - closures
-  0xf0: ['CREATE', 32000, 3, 1, true, true],
-  0xf1: ['CALL', 700, 7, 1, true, true],
-  0xf2: ['CALLCODE', 700, 7, 1, true, true],
-  0xf3: ['RETURN', 0, 2, 0, false],
-  0xf4: ['DELEGATECALL', 700, 6, 1, true, true],
-  0xf5: ['CREATE2', 32000, 4, 1, true, true],
-  0xfa: ['STATICCALL', 700, 6, 1, true, true],
-  0xfd: ['REVERT', 0, 2, 0, false],
-
-  // '0x70', range - other
-  0xfe: ['INVALID', 0, 0, 0, false],
-  0xff: ['SELFDESTRUCT', 5000, 1, 0, false, true]
-}
+export default function (op, full) {
+  const codes = {
+    // 0x0 range - arithmetic ops
+    // name, baseCost, off stack, on stack, dynamic, async
+    // @todo can be improved on basis of this: https://github.com/ethereumjs/ethereumjs-vm/blob/master/lib/evm/opcodes.ts
+
+    0x00: ['STOP', 0, 0, 0, false],
+    0x01: ['ADD', 3, 2, 1, false],
+    0x02: ['MUL', 5, 2, 1, false],
+    0x03: ['SUB', 3, 2, 1, false],
+    0x04: ['DIV', 5, 2, 1, false],
+    0x05: ['SDIV', 5, 2, 1, false],
+    0x06: ['MOD', 5, 2, 1, false],
+    0x07: ['SMOD', 5, 2, 1, false],
+    0x08: ['ADDMOD', 8, 3, 1, false],
+    0x09: ['MULMOD', 8, 3, 1, false],
+    0x0a: ['EXP', 10, 2, 1, false],
+    0x0b: ['SIGNEXTEND', 5, 2, 1, false],
+
+    // 0x10 range - bit ops
+    0x10: ['LT', 3, 2, 1, false],
+    0x11: ['GT', 3, 2, 1, false],
+    0x12: ['SLT', 3, 2, 1, false],
+    0x13: ['SGT', 3, 2, 1, false],
+    0x14: ['EQ', 3, 2, 1, false],
+    0x15: ['ISZERO', 3, 1, 1, false],
+    0x16: ['AND', 3, 2, 1, false],
+    0x17: ['OR', 3, 2, 1, false],
+    0x18: ['XOR', 3, 2, 1, false],
+    0x19: ['NOT', 3, 1, 1, false],
+    0x1a: ['BYTE', 3, 2, 1, false],
+    0x1b: ['SHL', 3, 2, 1, false],
+    0x1c: ['SHR', 3, 2, 1, false],
+    0x1d: ['SAR', 3, 2, 1, false],
+
+    // 0x20 range - crypto
+    0x20: ['SHA3', 30, 2, 1, false],
+
+    // 0x30 range - closure state
+    0x30: ['ADDRESS', 2, 0, 1, true],
+    0x31: ['BALANCE', 700, 1, 1, true, true],
+    0x32: ['ORIGIN', 2, 0, 1, true],
+    0x33: ['CALLER', 2, 0, 1, true],
+    0x34: ['CALLVALUE', 2, 0, 1, true],
+    0x35: ['CALLDATALOAD', 3, 1, 1, true],
+    0x36: ['CALLDATASIZE', 2, 0, 1, true],
+    0x37: ['CALLDATACOPY', 3, 3, 0, true],
+    0x38: ['CODESIZE', 2, 0, 1, false],
+    0x39: ['CODECOPY', 3, 3, 0, false],
+    0x3a: ['GASPRICE', 2, 0, 1, false],
+    0x3b: ['EXTCODESIZE', 700, 1, 1, true, true],
+    0x3c: ['EXTCODECOPY', 700, 4, 0, true, true],
+    0x3d: ['RETURNDATASIZE', 2, 0, 1, true],
+    0x3e: ['RETURNDATACOPY', 3, 3, 0, true],
+    0x3f: ['EXTCODEHASH', 400, 3, 0, true],
+
+    // '0x40' range - block operations
+    0x40: ['BLOCKHASH', 20, 1, 1, true, true],
+    0x41: ['COINBASE', 2, 0, 1, true],
+    0x42: ['TIMESTAMP', 2, 0, 1, true],
+    0x43: ['NUMBER', 2, 0, 1, true],
+    0x44: ['DIFFICULTY', 2, 0, 1, true],
+    0x45: ['GASLIMIT', 2, 0, 1, true],
+    0x46: ['CHAINID', 2, 0, 1, false],
+    0x47: ['SELFBALANCE', 5, 0, 1, false],
+
+    // 0x50 range - 'storage' and execution
+    0x50: ['POP', 2, 1, 0, false],
+    0x51: ['MLOAD', 3, 1, 1, false],
+    0x52: ['MSTORE', 3, 2, 0, false],
+    0x53: ['MSTORE8', 3, 2, 0, false],
+    0x54: ['SLOAD', 800, 1, 1, true, true],
+    0x55: ['SSTORE', 0, 2, 0, true, true],
+    0x56: ['JUMP', 8, 1, 0, false],
+    0x57: ['JUMPI', 10, 2, 0, false],
+    0x58: ['PC', 2, 0, 1, false],
+    0x59: ['MSIZE', 2, 0, 1, false],
+    0x5a: ['GAS', 2, 0, 1, false],
+    0x5b: ['JUMPDEST', 1, 0, 0, false],
+
+    // 0x60, range
+    0x60: ['PUSH1', 3, 0, 1, false],
+    0x61: ['PUSH2', 3, 0, 1, false],
+    0x62: ['PUSH3', 3, 0, 1, false],
+    0x63: ['PUSH4', 3, 0, 1, false],
+    0x64: ['PUSH5', 3, 0, 1, false],
+    0x65: ['PUSH6', 3, 0, 1, false],
+    0x66: ['PUSH7', 3, 0, 1, false],
+    0x67: ['PUSH8', 3, 0, 1, false],
+    0x68: ['PUSH9', 3, 0, 1, false],
+    0x69: ['PUSH10', 3, 0, 1, false],
+    0x6a: ['PUSH11', 3, 0, 1, false],
+    0x6b: ['PUSH12', 3, 0, 1, false],
+    0x6c: ['PUSH13', 3, 0, 1, false],
+    0x6d: ['PUSH14', 3, 0, 1, false],
+    0x6e: ['PUSH15', 3, 0, 1, false],
+    0x6f: ['PUSH16', 3, 0, 1, false],
+    0x70: ['PUSH17', 3, 0, 1, false],
+    0x71: ['PUSH18', 3, 0, 1, false],
+    0x72: ['PUSH19', 3, 0, 1, false],
+    0x73: ['PUSH20', 3, 0, 1, false],
+    0x74: ['PUSH21', 3, 0, 1, false],
+    0x75: ['PUSH22', 3, 0, 1, false],
+    0x76: ['PUSH23', 3, 0, 1, false],
+    0x77: ['PUSH24', 3, 0, 1, false],
+    0x78: ['PUSH25', 3, 0, 1, false],
+    0x79: ['PUSH26', 3, 0, 1, false],
+    0x7a: ['PUSH27', 3, 0, 1, false],
+    0x7b: ['PUSH28', 3, 0, 1, false],
+    0x7c: ['PUSH29', 3, 0, 1, false],
+    0x7d: ['PUSH30', 3, 0, 1, false],
+    0x7e: ['PUSH31', 3, 0, 1, false],
+    0x7f: ['PUSH32', 3, 0, 1, false],
+
+    0x80: ['DUP1', 3, 0, 1, false],
+    0x81: ['DUP2', 3, 0, 1, false],
+    0x82: ['DUP3', 3, 0, 1, false],
+    0x83: ['DUP4', 3, 0, 1, false],
+    0x84: ['DUP5', 3, 0, 1, false],
+    0x85: ['DUP6', 3, 0, 1, false],
+    0x86: ['DUP7', 3, 0, 1, false],
+    0x87: ['DUP8', 3, 0, 1, false],
+    0x88: ['DUP9', 3, 0, 1, false],
+    0x89: ['DUP10', 3, 0, 1, false],
+    0x8a: ['DUP11', 3, 0, 1, false],
+    0x8b: ['DUP12', 3, 0, 1, false],
+    0x8c: ['DUP13', 3, 0, 1, false],
+    0x8d: ['DUP14', 3, 0, 1, false],
+    0x8e: ['DUP15', 3, 0, 1, false],
+    0x8f: ['DUP16', 3, 0, 1, false],
+
+    0x90: ['SWAP1', 3, 0, 0, false],
+    0x91: ['SWAP2', 3, 0, 0, false],
+    0x92: ['SWAP3', 3, 0, 0, false],
+    0x93: ['SWAP4', 3, 0, 0, false],
+    0x94: ['SWAP5', 3, 0, 0, false],
+    0x95: ['SWAP6', 3, 0, 0, false],
+    0x96: ['SWAP7', 3, 0, 0, false],
+    0x97: ['SWAP8', 3, 0, 0, false],
+    0x98: ['SWAP9', 3, 0, 0, false],
+    0x99: ['SWAP10', 3, 0, 0, false],
+    0x9a: ['SWAP11', 3, 0, 0, false],
+    0x9b: ['SWAP12', 3, 0, 0, false],
+    0x9c: ['SWAP13', 3, 0, 0, false],
+    0x9d: ['SWAP14', 3, 0, 0, false],
+    0x9e: ['SWAP15', 3, 0, 0, false],
+    0x9f: ['SWAP16', 3, 0, 0, false],
+
+    0xa0: ['LOG0', 375, 2, 0, false],
+    0xa1: ['LOG1', 375, 3, 0, false],
+    0xa2: ['LOG2', 375, 4, 0, false],
+    0xa3: ['LOG3', 375, 5, 0, false],
+    0xa4: ['LOG4', 375, 6, 0, false],
+
+    // '0xf0' range - closures
+    0xf0: ['CREATE', 32000, 3, 1, true, true],
+    0xf1: ['CALL', 700, 7, 1, true, true],
+    0xf2: ['CALLCODE', 700, 7, 1, true, true],
+    0xf3: ['RETURN', 0, 2, 0, false],
+    0xf4: ['DELEGATECALL', 700, 6, 1, true, true],
+    0xf5: ['CREATE2', 32000, 4, 1, true, true],
+    0xfa: ['STATICCALL', 700, 6, 1, true, true],
+    0xfd: ['REVERT', 0, 2, 0, false],
+
+    // '0x70', range - other
+    0xfe: ['INVALID', 0, 0, 0, false],
+    0xff: ['SELFDESTRUCT', 5000, 1, 0, false, true]
+  }
 
-module.exports = function (op, full) {
   const code = codes[op] ? codes[op] : ['INVALID', 0, 0, 0, false, false]
   let opcode = code[0]